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HP0-628 - Implementing HSx80 Compaq Storage Solutions for UNIX - Dump Information

Vendor : HP
Exam Code : HP0-628
Exam Name : Implementing HSx80 Compaq Storage Solutions for UNIX
Questions and Answers : 95 Q & A
Updated On : October 22, 2018
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HP0-628 Implementing HSx80 Compaq Storage Solutions for UNIX

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HP0-628 exam Dumps Source : Implementing HSx80 Compaq Storage Solutions for UNIX

Test Code : HP0-628
Test Name : Implementing HSx80 Compaq Storage Solutions for UNIX
Vendor Name : HP
Q&A : 95 Real Questions

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HP CEO Apotheker fired, changed by way of Meg Whitman | killexams.com Real Questions and Pass4sure dumps

apotheker-whitman.gi.top.jpg

Meg Whitman (left) will substitute Leo Apotheker as Hewlett-Packard's CEO.

ny (CNNMoney) -- Hewlett-Packard's board on Thursday ousted CEO Leo Apotheker after just eleven months on the job, changing him with Meg Whitman.

"i am honored and excited to lead HP," Whitman noted in a organized observation. "I consider HP concerns -- it concerns to Silicon Valley, California, the country and the world."

HP's board mentioned the enterprise obligatory a change on the accurate. The business cut its financial outlook three times in Apotheker's tenure, and on Thursday, HP observed it changed into now not confident it could be capable of meet its sales goals for the present quarter.

Shareholders despatched the inventory down more than 40% this yr before Fortune and different retailers broke the news this week that the board became considering that letting Apotheker go.

"we're at a essential second and we need renewed management to efficaciously put in force our approach and take advantage of the market opportunities forward," noted Ray Lane, who on Thursday turned into named govt chairman of HP's board.

Lane became previously an unbiased, non-govt chair. The enterprise mentioned it will look for somebody to fill that unbiased role on its board.

The chairman referred to on a conference call Thursday that the board considered many candidates and decided together that Whitman become the right fit.

"I can't feel of a reputation accessible i would opt for as CEO over Meg," observed Lane.

Apotheker will take domestic $25 million in severance

as the former head of European software large SAP (SAP), Apotheker become a curious option to lead HP (HPQ, Fortune 500) -- the biggest U.S. know-how business with the aid of income -- considering the fact that it's predominantly a hardware enterprise. HP's utility enterprise makes up around 2% of the company's annual earnings, which hit $a hundred twenty five billion ultimate yr.

Apotheker caught to what he knows premiere and determined to refocus HP on better-margin companies like cloud computing and software. He became specially bullish on HP's acquisition of Palm, which became made earlier than his arrival at the company. He deliberate to let Palm's webOS utility permeate the business's a considerable number of hardware lines, together with PCs, phones and the much-publicized TouchPad pill.

but the TouchPad become a failure, HP's phones weren't selling, and computing device earnings slumped globally. ultimate month, Apotheker introduced yet a further challenging left flip: He opted to conclusion the webOS experiment and pointed out HP would get out of the computing device enterprise absolutely -- a market that it leads both in the u.s. and globally.

The problem with Apotheker wasn't lack of imaginative and prescient as much as a lack of execution and communique, Lane said.

Whitman noted Thursday that the company below her leadership would live the course and continue to transition to an enterprise utility business.

"The simplest issue we can do to regain traders' and valued clientele' confidence is to execute, and that's the reason what I intend to do," she talked about.

0:00 / three:forty HP's decade of error

The ousting of its third straight CEO marks yet a different dramatic disaster in a decade of turmoil for one in every of Silicon Valley's common pioneers. A 12 months prior, Mark Hurd changed into fired as HP's CEO after submitting false price stories in what gave the impression to be an effort to conceal a relationship with a former worker.

In 2006, HP's chairwoman Pattie Dunn turned into proven the door after it was published that she had spearheaded a secret probe to secret agent on fellow board members and journalists, in an try and discover the source of board-level media leaks.

A 12 months before that, in 2005, then-CEO Carly Fiorina was booted out (she technically resigned, however, the flow wasn't certainly voluntary) after spearheading HP's the failed merger with Compaq. The business's inventory price become reduce in half throughout her tenure.

The CEO revolving door has can charge the enterprise more than $83 million in severance pay, including more than $25 million that should be owed to Apotheker.

warding off criticism from analysts that the board is dysfunctional, Lane argued that the board is awfully different than the ones of the previous, constituted of 8 new administrators considering the company ousted Hurd.

"I inform you this right from my coronary heart," he said. "it's no longer this board. They work in fact well collectively."

Whitman, who is additionally an HP board member, turned into previously the CEO of eBay (EBAY, Fortune 500). She headed the online public sale web site for 10 years, taking on the company in 1998 when it became in its infancy. by the time she left in 2008, the enterprise had grown to an $eight.5 billion e-commerce behemoth.

She become the Republican nominee within the 2010 California gubernatorial race, spending a great deal of her fortune in her unsuccessful campaign. She then resurfaced a few months later, when she become named to HP's board in January.

What to make of Whitman

Lane, HP's chairman, praised Whitman, saying her experience offers her the appropriate set of knowledge to lead HP lower back on path.

"Meg is a technology visionary with a confirmed song checklist of execution," he mentioned. "She is a powerful communicator who's consumer concentrated with deep management capabilities. furthermore, as a member of HP's board of directors for the past eight months, Meg has a great realizing of our items and markets."

Is HP's board the worst ever?

nevertheless, many analysts had been scratching their heads in regards to the option.

"i am no longer really satisfied she's the most suitable fit -- HP must regain the self belief of its commercial enterprise consumers, and her abilities resides within the buyer retail market," pointed out Ron Gruia, primary consultant at Frost & Sullivan.

"She's on the board, so she's a logical period in-between alternative, but no longer a person who's going to be driver for HP as it transitions to a application and features variety of model," Gruia delivered.

Some accept as true with that HP is making a deadly decision.

"As if HP did not make a mistake on bringing in Leo Apotheker, now they are making an excellent larger mistake via bringing in Meg Whitman, someone with very little experience in the core areas of HP," said Vanessa Alvarez, analyst at Forrester research.

"here is simple carelessness by way of the board of directors, and quite frankly, hammering the final nail in the coffin for HP. Its management is in the gutter. i am appalled," she introduced.

however other analysts accept as true with Whitman is in a position to doing the job, albeit a very elaborate one.

"She's a great communicator; a good marketer; and, a brilliant supervisor, but she'll need to put a strategic stamp on HP," spoke of Joel Achramowicz, senior vp of research at Blaylock Robert Van.

"There are much more questions and issues related to HP exigent from both the road and from valued clientele. She'll have to work expediently." 


Hewlett-Packard And 3D Printing: The road To Redemption | killexams.com Real Questions and Pass4sure dumps

No effect found, are attempting new keyword!was a large bet that didn't pay off, (it) did not even come close to reaching what Fiorina and HP's board spoke of was in keep. At bottom, they made an enormous error in asserting that the merger of two dropping ...

U.S. Navy Selects HP PCs for foreign places community | killexams.com Real Questions and Pass4sure dumps

PALO ALTO, CA--(Marketwired - Mar 6, 2014) - HP ( NYSE : HPQ ) nowadays introduced that HP PCs had been chosen as part of the U.S. Navy's alternative of Integration technologies group, Inc. (ITG) for the refresh of OCONUS Navy commercial enterprise network (ONE-net), the Navy's enterprise network of bases backyard the continental u.s..

The ONE-net delivery order contains a two-12 months base length and two-yr choice duration, and is not to exceed $forty million. As part of the beginning order, HP laptop PCs, shows, notebooks and capsules will change the existing methods at home and international bases. ONE-internet offers technical capabilities, equivalent to comfy community access, for deployed and assist forces at 14 foreign places fleet bases and stations in the some distance East, the core East and Europe.

"incomes the Navy's business additional validates HP's acceptance for advanced nice and reliability. furthermore this solidifies our dedication to speed up our expense of innovation in our pc and printing products these days and in the future," noted John Solomon, senior vice chairman, Printing and private methods, and managing director, Americas, HP. "This contract allows Navy personnel to entry critical suggestions with seamless connectivity to the world tips grid."

To at ease this chance, HP labored with ITG to offer services and assist, and collaborated with GovConnection for oblique product achievement.

items that can be disbursed as part of the contract encompass HP EliteBook laptop PCs, HP Elite pill PCs and HP Compaq Elite laptop PCs. HP Elite PCs are fastidiously proven to help make sure reliability. all the way through the HP total look at various process, HP PCs event one hundred fifteen,000 hours of performance trials. moreover, the HP EliteBook PCs and HP Elite drugs pass the rigorous MIL-STD 810G testing for vibration, dirt, shock, altitude, extreme temperature, low temperature, temperature shock, humidity and drops.(1)

The choice was based on can charge, previous performance and the supplier's ideas for technical efficiency.

About ONE-internet The OCONUS Navy enterprise community (ONE-internet) is a branch of the Navy initiative to convey finished, conclusion-to-conclusion information and telecommunication functions to OCONUS Navy shore commands by using a standard computing environment for each the Non-secure IP Router network (NIPRNet) and at ease IP Router network (SIPRNet). ONE-web is distinctive as executive-owned and govt-operated until the community transitions to the next generation commercial enterprise network (NGEN) and adopts the NGEN working model and assist constitution. extra information is available at http://www.public.navy.mil/spawar/PEOEIS/NEN/ONE-net/Pages/default.aspx

About HP HP creates new probabilities for technology to have a meaningful affect on individuals, organizations, governments and society. With the broadest expertise portfolio spanning printing, very own systems, software, services and IT infrastructure, HP provides options for shoppers' most complicated challenges in every region of the area. extra tips about HP is purchasable at http://www.hp.com.

(1) checking out became now not supposed to demonstrate fitness for U.S. department of defense contract necessities or for defense force use. check consequences are not a assure of future efficiency under these check circumstances.

This news free up carries forward-searching statements that involve risks, uncertainties and assumptions. If such hazards or uncertainties materialize or such assumptions prove fallacious, the results of HP and its consolidated subsidiaries could vary materially from these expressed or implied with the aid of such forward-looking statements and assumptions. All statements other than statements of historical truth are statements that can be deemed ahead-looking statements, together with however now not constrained to statements of the plans, options and ambitions of management for future operations; any statements regarding expected development, performance, market share or competitive efficiency concerning products and features; any statements concerning expected operational and fiscal outcomes; any statements of expectation or belief; and any statements of assumptions underlying any of the foregoing. hazards, uncertainties and assumptions consist of the deserve to address the numerous challenges facing HP's businesses; the competitive pressures confronted by HP's companies; hazards associated with executing HP's strategy and plans for future operations; the influence of macroeconomic and geopolitical tendencies and activities; the should manipulate third-birthday celebration suppliers and the distribution of HP's items and features without problems; the insurance plan of HP's highbrow property assets, together with highbrow property licensed from third parties; dangers associated with HP's overseas operations; the development and transition of new items and capabilities and the enhancement of latest products and capabilities to fulfill client wants and reply to emerging technological trends; the execution and efficiency of contracts with the aid of HP and its suppliers, purchasers, shoppers and companions; the hiring and retention of key employees; integration and other hazards linked to enterprise mixture and investment transactions; the execution, timing and results of restructuring plans, together with estimates and assumptions involving the can charge and the anticipated merits of imposing those plans; the resolution of pending investigations, claims and disputes; and other dangers which are described in HP's Annual record on form 10-ok for the fiscal year ended October 31, 2013, and which are otherwise described or up-to-date now and again in HP's Securities and alternate commission experiences. HP assumes no duty and doesn't intend to replace these forward-searching statements.

© 2014 Hewlett-Packard construction enterprise, L.P. The tips contained herein is area to exchange without word. The only warranties for HP items and functions are set forth within the categorical assurance statements accompanying such products and capabilities. Nothing herein may still be construed as constituting an additional warranty. HP shall no longer be liable for technical or editorial mistakes or omissions contained herein.


HP0-628 Implementing HSx80 Compaq Storage Solutions for UNIX

Study Guide Prepared by Killexams.com HP Dumps Experts


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HP0-628 exam Dumps Source : Implementing HSx80 Compaq Storage Solutions for UNIX

Test Code : HP0-628
Test Name : Implementing HSx80 Compaq Storage Solutions for UNIX
Vendor Name : HP
Q&A : 95 Real Questions

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Implementing HSx80 Compaq Storage Solutions for UNIX

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How to cook up a storage-area network | killexams.com real questions and Pass4sure dumps

COMPUTING

September 3, 1999Web posted at: 3:43 p.m. EDT (1943 GMT)

by Deni Connor

From...Network World Fusion

(IDG) -- Storage-area networks (SAN) are being adopted more frequently today, but uncertainty still exists among users about why to install them and the applications that can make the best use of them. SANs are high-speed networks, similar to LANs, that connect disk subsystems directly to servers or clients. The idea is to relieve network congestion or bypass distance limitations imposed by traditional SCSI storage connections.

Fibre Channel-based SANs can be configured in several ways and for any number of reasons (see graphic). They can be installed as Fibre Channel Arbitrated Loops (FCAL) or switched fabric networks. They can be local or remote, spanning campuses and using wide-area connections.

Methods for implementing SANs may differ, but most network professionals offer the same recipe from one installation to another: start small and think globally. They recommend implementing small, simple FCAL or switched fabric networks to share data among servers.

"You need to approach SANs with a broader plan than simply dropping in [more storage] and seeing if it is going to be successful,"says Lee Congdon, senior vice president of strategic integration and architecture for NASD in New York. NASD is the parent company of the NASDAQ stock exchange.

"You need to plan not only where you are today, but where you want to be tomorrow and then consciously choose the applications that work in the context of a bigger picture," Congdon adds.

Look to your apps

Congdon and other users say to look at your applications to determine which applications warrant adding a SAN and which will do just as well on server-attached RAID. They say to begin with a small, low-impact or low-budget application, such as consolidating several servers to the same storage device, before moving to full-blown implementation.

From this application, users can test the "proof of concept," and then grow the SAN to involve more of the routine tasks of the data infrastructure. For example, data replication and creating multiple active copies of data that would increase utilization or ease maintenance and testing operations.

Users also recommend dividing applications into categories based on importance. For mission-critical application data, users need to design in redundancy and fault tolerance with duplicated storage, switches and host bus adapters, so there is no single point of failure.

For example, at NASD, Congdon has several Sequent NUMA servers running Unix connected via a Fibre Channel switch to a single EMC Symmetrix disk subsystem; Dwight Gibbs, chief technical fool at The Motley Fool, connects Windows NT servers via a hub to a Compaq StorageWorks disk array; and Bruce Covey of Home Depot in Smyrna, Ga., connects numerous Macintosh workstations to Avid video editing storage via a Fibre Channel hub.

Prepare for future

Not surprisingly, users have implemented SANs in different ways, but most are preparing for future growth.

For example, Congdon's switched fabric SAN will be able to easily expand as he adds more applications. The Motley Fool and Home Depot use FCAL and will need to migrate to a switched fabric architecture before they can add any more servers, clients or applications to their SANs.

Users agree, though, that relying on a systems vendor or integrator for your first SAN implementation is the wise route.

Gibbs says you should also expect your vendor to guarantee interoperability between Fibre Channel and SCSI devices.

"I want a 60- to 90-day money-back guarantee. If it works, I'll keep it. If not, I want to return it. So far, I have not run into a situation where we just couldn't make something work," Gibbs says.

While Congdon generally agrees with Gibbs, he takes vendor participation a step further. He thinks that it is reasonable to choose a vendor to implement a limited package. He adds that it is unlikely a vendor would be able to completely understand business applications and where a midsize to large business is going.

Congdon and Gibbs also believe the plan for a data infrastructure closely parallels the network and systems infrastructure. Blending the three into a single cohesive network is necessary to the planning. That way, storage becomes another infrastructure resource that users can manage. This strategy also helps ensure network, applications and other groups in the enterprise network environment interoperate.

Successful SAN implementation also depends in large part on getting the approval of management, says Steve Rigney, a consultant with NetReference in Sterling, Va.

For example, Congdon's SAN is just the start of a much larger SAN implementation that management has approved and provided the funds for. He wouldn't have the SAN if he hadn't convinced people of the cost savings and benefits of centralized storage solutions over stovepipe storage growth.

"Ensuring that you get a properly funded program and a disciplined investment plan rather than budgeting in fits and starts is important," Congdon says. "You don't want the first application to have to bear all the cost. You need to think about planning for this, investing in it, and then allocating the cost back to the business across multiple applications."

RELATED STORIES:

New group plans testing for wireless LANsAugust 23, 1999Your own private InternetJuly 22, 1999Free Web-based drive offers 25MB of accessible-anywhere storageJuly 12, 1999

RELATED IDG.net STORIES:

Compaq introduces SAN bundles(Network World Fusion)Computer Associates spins out SAN plan(Network World Fusion)StorageTek looks to combine SANs, NAS(InfoWorld Electric)Vendors tackle SAN standards(Computerworld)IBM brings SAN strategy to the table(InfoWorld Electric)

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Fibre Channel Overview: Storage Area NetworkSAN Resource Center, from Gadzoox

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Wise Drives | killexams.com real questions and Pass4sure dumps

By Gordon F. Hughes

Image: Larry Gilpin/Stone Image: Larry Gilpin/Stone

If disk drives were enabled to perform a host of tasks that have traditionally been the work of CPUs, dramatic low-cost improvements could be made in computing environments ranging from laptops to storage networks and drive makers would gain new profit centers. But this will only happen if computer and drive manufacturers seize the opportunity and create new interfaces for these so-called intelligent disk drives.

Disk drives currently come equipped with 32-bit internal microprocessors, several megabytes of internal RAM, and tens of megabytes of disk capacity reserved for internal drive purposes. This onboard computing power has increased alongside improvements in the speed and capacity of disk drives, and has already allowed them to take on several intelligent tasks beyond basic data storage and retrieval, such as detecting imminent drive failures. This power could be exploited for even more tasks, and the addition of some relatively inexpensive extra processing power would open the door to a huge array of functions, such as searching and encryption, and so shift some of the processing burden from CPUs and networks to disk drives.

Modern drives are nearly all standardized: they have common physical dimensions, electrical and data connections, and operational commands—all defined by ANSI standards. Interfaces between computers on one side and drives on the other constitute an agreed contract on the rules for storing and retrieving data. Adding intelligent drive features may require changing these entrenched standards, and may also require changes in operating system and application software. High-level control of intelligent features may best reside in user applications, allowing them to tune a drive’s performance to their specific needs.

It is my hope that after reading this article, developers of such software would become involved in the interface committees of organisations such as the Storage Network Industry Association (SNIA), which currently consist primarily of drive makers and drive buyers. But why should intelligent features appear now, when for decades disk drive development has been fixated on faster access to more data?

graph bit density of disk drives

An Embarrassment of Riches: The bit density of disk drives is growing even faster than the transistor population of microprocessor chips (which still obeys Moore’s law). With disk capacity no longer an issue for most users, drive manufacturers would do well to add features to stay ahead of the competition.

For 50 years hard disks have acted as relatively dumb devices, simply serving and storing blocks of data. The first generation of hard-disk drives were the size of refrigerators and stored a few megabytes for mainframe computers. Since 1992, drive storage capacity has been increasing at an annual rate of 60 percent, and over 100 percent in recent years—a rate exceeding the 18-month doubling of Moore’s law for IC complexity [see graph]. Single drives today can store up to 200 GB and standard 3.5-inch disk drives are in everything from PCs to supercomputers (laptop computers use smaller 2.5-inch drives).

But the drive manufacturers have to some extent become victims of their own success. The industry has matured and is delivering highly reliable low-cost storage, at capacities that exceed the real needs of the majority of today’s end users, typically desktop PC users. All drive manufacturers offer similar-performance mass-market products, which are seen as commodity items.

In my position as associate director of the Center for Magnetic Recording Research (CMRR) at the University of California, San Diego, I see how this commoditization shrinks the number of drive manufacturers and drive component makers, and reduces the number of research jobs for our students—hampering the very development that produced the remarkable drive technology advances in the first place. Customizable intelligent features would allow drive makers to distinguish their products and provide a competitive edge and an impetus for innovation.

The most common drive interface in consumer desktop computers is the advanced technology attachment (ATA) interface, also known as integrated drive electronics (IDE). The small computer system interface (SCSI) is prevalent in high-performance systems. Each interface consists of an adapter integrated into the host at one end connected via a cable to the disk drive(s) at the other end.

In both ATA- and SCSI-based systems, computers commonly divide a data file into a set of so-called logical blocks whose size ranges (depending on the platform and operating system) from 512 bytes to 4096 bytes and up. The logical blocks are passed over the interface to the drive, which stores them as physical blocks, usually of the same byte size, by magnetically recording bits on a cobalt alloy magnetic film coated on the disk surfaces. The physical blocks are stored in concentric tracks subdivided into angular sectors on the disks, which are constantly rotating during operation.

Conversely, in accessing stored data, the drive reads back each physical block magnetically as a noisy analog electronic signal and translates it into digital bits to reconstitute the physical block.

Already pretty smart

To do all this, disk drives already perform complex tasks hidden from the host computer. Errors can be detected and corrected. An impending crash can be anticipated. An array of disk drives can even recover data on their own from a disk that has crashed, without involving the system at large.

Data integrity is ensured by sophisticated algorithms that clean up the raw data from the disk using digital error checking and correction codes (ECC). ECC code bits are recorded along with user data in the physical blocks. A first level of error correction is built into the drive control electronics, to deliver corrected user data without delays while decreasing the probability of an incorrect bit from about one in a million at the playback magnetic bit detector to less than one in 10 trillion for the delivered logical block.

If this first line of error correction fails, additional levels of off-line error recovery are invoked. In disk drives, off-line means that the drive stops delivering data at full speed as time is needed to correct a data error. Typical off-line error-recovery techniques include: attempting to reread the data on a second disk revolution; rereading the data by positioning the read/write head slightly off track; and using a higher-level ECC algorithm in the drive microprocessor firmware. Hard-to-read physical blocks are reassigned (re-recorded) to alternative disk locations and the original locations are not reused.

The philosophy here is that returning error-free user data is so important that delays are acceptable. For some applications, though, this assumption may not be correct—users of a multimedia player showing a digital video clip may find a pause more distracting than the occasional dropped frame. Currently there is no good way to allow a drive to distinguish between different types of user data.

Another intelligent feature of today’s disk drives reduces the chances that a hard-disk crash will leave a user without data. Disk drives have failure rates of only about 1 percent per year, but the loss of a user’s data can easily be more costly than the drive itself. If they were forewarned of an impending drive failure, users could take steps to back up their data onto another storage device.

To this end, in 1994 the drive industry adopted a standardized specification for such failure warnings called Smart (self-monitoring and reporting technology) at the request of Compaq Computer Corp. Smart is based on monitoring for excessive internal drive errors, such as bit-read errors and track-seek errors. A failure-warning algorithm running in the drive’s microprocessor checks whether error rates exceed a threshold value and if they do, produces a warning that is sent over the drive interface to the host CPU.

Virtually all disk drives today have this failure-warning system built in. All the same, some computers simply ignore the warning. A research program on Smart here at the Center indicates considerably higher Smart warning accuracy is possible with improved drive firmware.

A third intelligent drive task today helps high-end storage systems, those using a RAID-5 disk organization (redundant array of independent disks). These systems store data blocks over multiple drives to gain the speed of parallel access in such a way that drives can fail and be replaced without loss of user data. Such computer systems mostly use the SCSI interface, which allows drives to recover the data autonomously from the failed drive, without burdening the host computer system with the work. So drives are already networking without computer help.

Better, faster than before

But if more intelligence is to be added to disk drives in the form of new firmware and/or extra onboard processing power, computer manufacturers must be convinced of the benefits of the new features to them and to application developers and end users. An example would be in-drive tools for handling data delays, integrity, and corruption control. These would allow so-called disk-drive quality-of-service (QoS) features.

In retrieving user data, drives have variable delays due to track-seek and disk-rotation times. A drive may have to wait several milliseconds for its read/write heads to travel back and forth over a span of tracks, and then wait a few more milliseconds for disk rotation to bring the desired data block under a head. When beginning an access, drives can internally determine these motion delays, but there is currently no way of informing the application using the disk drive—even though applications like streaming video cannot use data that arrives too late.

Interface QoS commands could be added to provide precise information about delays and allow applications to abandon a data access if the delays were deemed excessive, or to optimize a group of data accesses. Today, drive QoS refers to nothing more precise than the average data-access speed of a group of drives.

Off-line error correction also introduces unexpected data delays. Currently, drives sold for video streaming applications may simply have off-line error correction disabled to guarantee throughput, but QoS commands could allow computers to turn the off-line correction on and off depending on the file type—off for MP3 music data files and on for application software files, for example.

Sending data over a network to a drive or array of drives can also cause data errors, which must be detected. Currently, drives calculate a data-error detection code (called a CRC polynomial code) before sending blocks across the interface to the computer, intended to allow checking of storage device connectors and cables. The CRC system could be extended to assist storage network administrators, allowing fault tracing down to individual hardware such as routers, disk and tape interfaces, and drives, and to environmental factors such as the power supply and ambient temperature.

Orderly storage

Storage systems such as file or database servers offer a fertile ground for other improvements. Many of them cache logical blocks in their RAM during drive accesses. This helps because consecutive logical block operations are often made on the same or the next logical block in the sequence, forming a complete file or database record. Simultaneously, drives perform physical block caching (such as reading all the sectors on a track into the drive’s on-board RAM when a single sector is read) to speed access because the next logical block needed is often also the next physical block.

These two caching operations are unaware of each other and may be redundant. Worse, they may even mutually interfere, as when the storage system demands a chain of logical blocks to cache, which may be scattered over several disk tracks, while the disk drive is trying to cache all the physical blocks in each track. Intelligent drives could allow servers to control drive caching on the level of entire files. To this end, an Object-Based Storage Devices (OSD) standard has been proposed for SCSI systems by the SNIA.

A storage object may be any number of things. It can be a file consisting of an ordered set of logical data blocks, a database containing many such files, or just a single application record such as a database record of one transaction. Information about the data is also stored in an object, which can include QoS, security, caching, and backup requirements. OSD disk drives could perform data pre-access, which could put sequential logical blocks in the drive’s cache memory, instead of sequential physical blocks. Drives could transmit them at the full interface transfer rate without waiting for disk rotation or track seeks. And once drives start dealing with data objects instead of their individual logical blocks, even more possibilities open up. Storage systems, which must handle such tasks as data mining, backup, and compression, could be implemented and scaled up much more efficiently.

Object-aware drives could speed up the process of making backups by maintaining internal lists of which object blocks have been rewritten since the last backup (currently a housekeeping task managed by host computer backup software). Only altered blocks would need to be transferred to an incremental backup system, instead of entire files.

Data compression on individual files could also be performed by OSD-based systems. Without OSD, compressing data at the drive level can generate a block consisting of data from multiple files. If any errors occur during compression, all those files are at risk. Another risk is storage capacity overflow, because the size of a compressed file isn’t known until its compression is finished.

Spreading the load

But data mining has perhaps the most to gain from object-aware drives. Data mining searches are a major bottleneck for the data farms that provide storage for such applications as e-commerce and scientific analysis of very large data sets such as the human genome.

Designers have long known that these intensive data mining searches benefit from parallel or distributed architectures. Dealing with such applications has given rise to many solutions in which storage intelligence has been moved as near to the drive as possible, but ultimately still resides on the computer side of the drive interface.

Since the 1980s, specialized database systems have been built that use a main computer to divide search jobs into independent tasks that are sent to subprocessors for execution, each having its own memory and own local disk drives. The parallelism allowed searches of terabyte-sized databases with an order of magnitude performance increase over normal serial computer systems. But these specialized systems were expensive—and they still just used standard disk drives.

Today database computers more commonly use storage systems based on RAID systems using fiber-channel SCSI drives. Damaged disk drives in these redundant arrays can be replaced without losing data. Up to 127 drives can be daisy-chained in a loop that can accommodate two simultaneous drive commands. Because many drives are running in parallel, an array is also fast. Yet the maximum data transfer rate of the array can be far below the combined transfer rate of all the drives in a loop—because all the drives share the bandwidth of a single interface connection. For example, a database query requiring searching through all the drives could be as little as 2/127, or 1.6 percent, as fast as the maximum data transfer rate of all the drives operating independently.

As a consequence, in storage systems where speed is a concern, loops are limited to five or six drives each, trading off cost for performance. A technique known as fiber-channel switched fabric can also address the bottleneck by establishing direct independent connections between the storage computer and the drives, but again at increased cost.

illustration traffick performance data

Easing Traffic on the High-Performance Data Highway: Currently, data searching on a RAID server is inefficient. To find records containing a given term all the disk drives must send their entire contents back to the host CPU for examination, causing data congestion in the daisy chain loop [left]. Intelligent drives could be sent the search term and autonomously return just those records that contain it, allowing faster searches with less congestion [right]. Click on image for a larger view.

Putting low-level search intelligence inside drives could be faster and far less expensive. The database application would break searches into individual commands, which would be sent out simultaneously to all drives. Only successful search results from drives would be returned [see illustration, above].

Inner security

Intelligent disk drives could also make computers much more secure and alleviate some of the concerns that have arisen in recent years in military, governmental, and business circles when laptops or hard disks themselves have gone missing.

With current systems, normal erasure of disk data does not necessarily prevent later retrieval of that data. Indeed, drives are designed to resist accidental erasure by a user. Special programs are widely available for retrieving apparently erased files, forcing security-conscious organizations to take precautions to ensure that disk drives have been completely wiped before being disposed of.

Commands that aid in this disk sanitizing were added to both the ATA and SCSI drive specifications at CMRR’s request. The secure-erase process is similar to whole-drive formatting because it overwrites all user-accessible data areas on a drive, including any disk flaw reassignments. Still, it can take over an hour to repeatedly overwrite all the blocks on a modern 180-GB drive—if data is only overwritten once, it may be recovered by scanning the disk platter with a magnetic force microscope. Also, secure erase is still an optional feature in the specs and not always implemented. Nor does secure erase eliminate the problem of securing data on disks in active use.

To protect data in active use, operating systems such as Microsoft Windows XP and Linux provide file encryption. However, encryption at the software level is complex to manage. Implementing file encryption keys and algorithms in disk drives would be easier, with the drives transparently encrypting the data. (Decrypting data from drives would remain an external software task.)

The long execution time penalty of secure erase would vanish, because the encrypted contents of an entire disk could be effectively destroyed in an instant by simply deleting the external software decryption keys (securely, of course). One can imagine the utility of such a feature onboard, for example, the EP-3 spy plane that was forced to make an emergency landing in Hainan last year as the crew hastily destroyed disk drives and other sensitive equipment in a bid to prevent information falling into Chinese hands.

Contingent arrival

While intelligent drive features can be added without interface specification changes by using the “vendor reserved commands” already defined in ATA and SCSI, this limits the features to just those agreed on between a single pair of drive and computer manufacturers. Such an arrangement may be a useful proving ground for a new feature, but for widespread use its input/output and command requirements need to appear in the interface specification.

In short, there must be an industry consensus that the task is of general appeal and offers market opportunities for multiple computer and drive companies. A recent example is the addition of the specialized requirements for flash memory PC data-storage cards to the ATA interface specs.

Computer application developers, such as large database search engine designers, may need to first see potential benefits from QoS features demonstrated. University research projects may be the initial step (RAID storage systems were first studied at the University of California, Berkeley). Computer simulation and monitoring of storage networks can also allow assessing performance improvements offered by intelligent features in advance of actual deployment.

Object storage devices have been studied at Carnegie Mellon University, and are under study by the SCSI spec committee. Interested members of the SNIA trade group are moving this proposal forward by working on the definition of an OSD standard.

Customers always determine the acceptance of new technologies, and many of these intelligent drive tasks are of primary benefit to final computer users, who are not the direct buyers of disk drives. For example, although Smart is advertised by PC makers Dell and Compaq as a principal hard-disk feature, PC makers are not currently asking for the higher-accuracy Smart warning discussed above, although it adds no drive cost. This may offer a market opportunity window for the first drive and computer makers to offer it. When developers and users become aware of potential new intelligent features, and ask computer and storage system makers for them, then drive makers will design them in.

About the Author

GORDON HUGHES (F) is associate director of the Center for Magnetic Recording Research at the University of California, San Diego.

To Probe Further

For more information about Smart and other intelligent drive research, visit the Web site of the Center for Magnetic Recording Research, University of California, San Diego (http://cmrr.ucsd.edu/homeset.htm). Details of the SCSI specification can be found at http://www.t10.org. Work on object-based storage devices is described at the Storage Networking Industry Association trade group’s Web site, at http://www.snia.org.


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HP HP0-628 Exam (Implementing HSx80 Compaq Storage Solutions for UNIX) Detailed Information



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