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Topic: Data striping

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	SNIA - Storage Networking Industry Association: Dictionary D
		Data Management Services are not in the data path; rather, they provide control of, or utilize, data in the delivery of their services.
		Data shredding is not generally held to make data completely unrecoverable in the face of modern forensic techniques-that requires shredding of the disks themselves.
		A disk array data mapping technique in which fixed-length sequences of virtual disk data addresses are mapped to sequences of member disk addresses in a regular rotating pattern.
	www.snia.org /education/dictionary/d (2885 words)

	Data striping - Wikipedia, the free encyclopedia
		The term Data striping refers to the segmentation of logically sequential data, such as a single file, so that segments can be written to multiple physical devices (usually disk drives) in a round-robin fashion.
		Data striping is used in some modern databases, such as Sybase, and in certain RAID devices under software or hardware control, such as IBM's RAMAC array subsystem.
		Data striping is different from, and may be used in conjunction with, mirroring.
	en.wikipedia.org /wiki/Data_striping (167 words)

	Commodore.ca \| Windows \| What is RAID 5 / RAID5 Explained (Site not responding. Last check: 2007-11-03)
		Data is striped across all five disks and the parity is used to recover a failed disk.
		A stripe consists of a row of sectors (a sector consists of 512 bytes) located in the same position on each disk across the width of the array.
		Data striping eliminates the use of dedicated drives and ensures that the data processing load is balanced among the available drives, while increasing performance by writing multiple blocks concurrently.
	www.commodore.ca /windows/raid5/raid5.htm (1743 words)

	Print Version - Scalable Systems Architecture: Scalable I/O, Part I: Disk Striping \| Business intelligence, data ...
		The optimal solution is to spread the data (that is, stripe the data) across at least four disks as shown in Figure 1.
		The striping is usually done in a round- robin fashion, which means that chunks of data (usually 32K to 64K each) are distributed to disk drives similar to the way a card dealer deals out a deck of cards.
		Striping is one of the most effective techniques for removing disk hot spots, and it's required if you want to be able to take advantage of I/O parallelism and have a highly scalable I/O subsystem.
	www.dmreview.com /editorial/dmreview/print_action.cfm?articleId=622 (1227 words)

	Ultera Systems \| What is Striping?
		Data transfer rate is increased by a factor of up to four respectively.
		Tape RAID Level-3 data can be distributed across either 2 or 4 different data channels with parity located on a different but dedicated channel.
		High speed data transfers are achieved with this configuration because of the combined performance of multiple data channels.
	www.ultera.com /ts-WhatsStriping.htm (575 words)

	application, database backup & disaster recovery, online backups, ...
		Data transfer rate, as well as search speed, is increased by as much as four times the speed of a single tape drive.
		Data transfer rate is increased by a factor of two or four respectively.
		Our striping systems are available in a variety of formats including Completely Integrated systems which consists of 2-5 tape-drives in a single enclosure with the striping controller integrated, Integrated-Drive solution with external controller, Completely External solution including the tape drives and the controller.
	www.unylogix.com /data_storage/hardware_other/tape_striping.html (876 words)

	An In-Depth Guide To RAID Technology
		I have mentioned striping in the earlier sections but have not explained thoroughly what it is. Striping improves the performance of the array by distributing the data across all the drives.
		When the data is read from the array, Hamming codes are used to check whether errors have occurred since the data was written to the array.
		In other words, data is striped across the array at the byte level with one dedicated parity drive holding the redundancy information.
	www.midwestdatarecovery.com /raid-an-in-depth-guide.html (4334 words)

	FAQ About RAID
		The parity data or disk is used to reconstruct data to a failed drive by comparing the data for the remaining drives in the array.
		This is known as mirroring, where data is written to two different disks at the same time, and data can be read from either disk.
		Disk striping with several disks similar to RAID 0, but a small percentage of those disks were set aside to be "check disk," A special Hamming Error Correction Codes is implemented.
	www.recoverdata.com /raidfaq.htm (438 words)

	DataCore \| Products \| Glossary
		Asynchronous mirrors are often used for long distance data replication where the time taken to transmit a write request from source to target would present a significant bottleneck for the application server issuing the write.
		By rotating the parity across all drives in the stripe, the bottleneck presented by the parity drive in RAID 4 is eliminated.
		A copy of data made at a specific point in time, also referred to as "point-in-time snapshot." Snapshots can be used to allow two application servers to access the same set of data at once, for example, to backup data to a tape drive.
	www.datacore.com /products/prod_glossary.asp (5103 words)

	striping (Site not responding. Last check: 2007-11-03)
		Data striping transparently distributes data over multiple disks to make them appear as a single fast, large disk.
		Fine grained disk arrays conceptually interleave data in relatively small units so that all I/O requests, regardless of their size, access all of the disks in the disk array.
		Finally, it is important to mention that selecting between the many possible data striping and redundancy schemes involves complex tradeoffs between reliability, performance and cost, which have been discussed in the next few sections.
	www.ecs.umass.edu /ece/koren/architecture/Raid/striping.html (467 words)

	RAID Data Recovery Services FAQ \| Vantage Data Recovery (800)487-5678 \| vantagetech.com
		A: In a RAID 5 configuration, additional data is written to the disk that should allow the volume to be rebuilt in the event that a single drive fails.
		Once the failed drive is replaced with a new hard drive (of the same or higher capacity), the "parity data" is used to rebuild the contents of the failed drive on the new one.
		It usually requires that data be recovered from each failed hard drive individually before attempting to address the rest of the volume.
	www.vantagetech.com /faq/raid-data-recovery-faq.html (1103 words)

	Aspen Systems, RAID Level Definitions
		According to the adjusted stripe size (e.g., 16 kb) and the number of disk drives, the data blocks are split into stripes.
		If a single drive fails, data is still available by using the data on the working drives and the parity drive to reconstruct the data.
		Unlike RAID 4, the parity data in a RAID 5 disk array are striped in all disk drives.
	www.aspsys.com /hardware/raid_storage/raid_levels (1165 words)

	Striping of Data Page, USGS Open-File Report 98-616, Multibeam Bathymetric and Backscatter Maps of the Upper Shelf ...
		Some of the striping is the result of poor data return at nadir (directly under the ship) due to rough sea states; this appears as evenly-spaced thin speckled lines.
		Other parallel striping is the result of differing acoustic responses of the surficial sediments depending on the angle of incidence of the sound front.
		In particular, the striping may be the effect of volume scattering in the region inside the critical angle in areas where a thin veneer of one sediment type over another.
	pubs.usgs.gov /of/1998/of98-616/pages/results_striping.html (276 words)

	Network Computing \| Workshop \| Data Management & Storage \| Raid's Ins & Outs \| Page 1 \| October 1, 2001 (Site not responding. Last check: 2007-11-03)
		Databases were growing to sizes that couldn't be handled by the disk technology available at the time, so striping was used to combine groups of disks to create one volume or directory that was not contained within a single physical drive.
		With striping, data that didn't fit on one disk could be spread across several disks.
		To identify data that is read or written incorrectly, parity is used to verify data integrity from disk to memory or vice versa.
	www.networkcomputing.com /1220/1220ws2.html (863 words)

	Untitled Document
		Striping is most commonly used in applications where the number of drives is a small number (2-5), and where a loss in user data and/or production time can be tolerated.
		Because user data spans all disks in the array, access and seek times for a RAID 3 array are identical to the access and single disk in the array.
		A new parity file is generated from the old data file and the old parity file and then the new data file and the new parity file are written.
	www.phenxint.com /tech/content_raid_primer.html (2804 words)

	Data Recovery History
		It is a standard which controls the flow of data between the processor and the hard disk.
		The collection of drives in a RAID Level 0 array has data laid down in such a way that it is organized in stripes across the multiple drives, enabling data to be accessed from multiple drives in parallel.
		Level 1 provides disk mirroring, a technique in which data is written to two duplicate disks simultaneously, so that if one of the disk drives fails the system can instantly switch to the other disk without any loss of data or service.
	www.essdatarecovery.com /hardtech.asp (610 words)

	Data Recovery Info on RAID0, RAID1, RAID2, RAID3, RAID4, RAID5 (Site not responding. Last check: 2007-11-03)
		Striping involves partitioning each drive's storage space into stripes which may be as small as one sector (512 bytes) or as large as several megabytes.
		In data intensive environments and single-user systems which access large records, small stripes (typically one 512-byte sector in length) can be used so that each record will span across all the drives in the array, each drive storing part of the data from the record.
		Because parity data must be skipped on each drive during reads, however, the performance for reads tends to be considerably lower than a level 4 array.
	www.datarecovery.com.sg /data_recovery/raid.htm (1794 words)

	DataRecoveryBC.com, your affordable data recovery service.
		RAID Level 0 (referred to as striping): data is split across drives.
		RAID Level 3 stripes data at a byte level across several drives, with parity stored on one drive.
		RAID Level 4 stripes data at a block level across several drives, with parity stored on one drive.
	www.datarecoverybc.com /raid.htm (220 words)

	Hardware and I/O (Site not responding. Last check: 2007-11-03)
		Stripe size must be at least as large as the I/O size.
		The large stripe size can be beneficial because it allows the system to perform more sequential operations on each disk; it decreases the number of seeks on disk.
		With OS striping, from a performance standpoint, the best layout is to stripe data, indexes, and temporary tablespaces across all the disks of your platform.
	www.usd.edu /oracle/doc/server.817/a76994/hardware.htm (1860 words)

	Information and help with computer RAID.
		Data is written to each drive in succession, each block going to the next available drive thus the data is distributed across the array drives (striping) providing faster operation and less chance that one drive will get overloaded with data requests.
		Data is written across each drive in succession, one bit at a time.
		Data striping is done across the drives, one byte at a time.
	www.computerhope.com /help/raid.htm (891 words)

	Raid: Data Striping, Mirroring, Parity; New, used and refurbished">			Data Striping - Data from the host computer is broken up into smaller chunks and distributed to multiple drives within a RAID array.
		The stripes are interleaved such that the logical storage unit is made up of alternating stripes from each drive.
		Data from the host computer is duplicated on a block-to-block basis across two disks.
	www.9to5computer.com /atto/Raid-Data-Striping-Mirroring-Parity.htm (782 words)

	I/O Guide for LC UCRL-WEB-201482
		If any portion of your data resides on an OST that is down, then attempted access of that file returns an I/O error until the faulty OST returns to service.
		Stripe width is the number of devices (or, in the case of Lustre, the number of OSTs) across which a file is divided.
		Striping over more OSTs will use a larger fraction of the available storage devices (or simply avoid TARing files that are already quite large).
	www.llnl.gov /LCdocs/ioguide/index.jsp?key=lustre-striping (551 words)

	Data Collection Page, USGS Open-File Report 98-616, Multibeam Bathymetric and Backscatter Maps of the Upper Shelf ... (Site not responding. Last check: 2007-11-03)
		Add: In some of the data, the faint regular parallel striping that is sometimes apparent (for example the backscatter intensity data on Figures 6 and 7-10) reflects the merging of data from adjacent swaths at the far range.
		Some of the data taken while the vessel was turning at the end of lines has not been removed from the data set to provide maximum data coverage.
		Other striping in the backscatter is the result of differing reflection depending on the angle of incidence of sound.
	pubs.usgs.gov /of/1998/of98-616/pages/data.html (621 words)

	NCSA Data Resources
		Striping is enabled for parallel access to a single file.
		In a parallel application all processes communicate their data back to one root process that carries out the actual disk I/O. Complicated to implement in a distributed memory environment such as MPI and, requires extra memory on the root process.
		Striping of large files across multiple OST's can be enable on a per-file or per-directory basis.
	www.ncsa.uiuc.edu /UserInfo/Data/filesystems/index.html (1667 words)

	[DWS — Data Warehouse Striping] (Site not responding. Last check: 2007-11-03)
		In this project we propose to develop an innovative technology to implement a data warehouse over an arbitrary number of computers (typically cheap workstations) and, at the same time, integrating this approach in the data warehousing technology available in the market.
		In data warehouse striping the fact tables are distributed by an arbitrary number of computers and the queries are executed in parallel by all the computers, guarantying a nearly optimal speed up.
		That is, the goal of the project is to develop a new data warehouse set of tools (that would be difficult to implant successfully in the market) but to develop a middleware that allows the use of the DWS approach with the available technology.
	www.cisuc.uc.pt /dsg/view_project.php?id_p=3 (311 words)

	Maximum Press : Home : AS/400 Encyclopedia : Data Striping (Site not responding. Last check: 2007-11-03)
		DB2 for AS/400 by automatically striping all writes to the data files upon which the data will be stored.
		DASD can store multiple blocks from a single file's most likely the multiple blocks for a file on a device are not logically contiguous.) This spreading across multiple DASD devices allows the data to be accessed in parallel.
		This is made possible because the multiple I/O processors (IOPs), supporting disk units on the AS/400 system, pre-process the data on writes and reads to improve access time.
	www.maxpress.com /encyclopedia/striping.htm (157 words)

	What is RAID
		Data storage access was, and is, limited by mechanical factors, such as rotational speed and latency.
		They overcame this by storing redundant data or parity data, which allows continued data access and even reconstruction in the event of a disk failure.
		However, the need for data storage capacity and high speed data access is growing faster than the capacity and transfer rates of individual drives.
	www.scantastik.com /data-storage/help-info/what_is_raid.htm (620 words)

	Database Journal: The Knowledge Center for DB2 Professionals
		To be useful, the data in a database must be persistent - that is the whole point of data management.
		The issue in DB2 UDB Version 7.2 was that when you added a new container to the table space (unless this was part of a redirected restore operation), the operation often forced a rebalancing of the data across all the containers (including the new one), such that the data was evenly distributed.
		Each stripe set is independent of the other stripe sets in the table space.
	www.databasejournal.com /features/db2/print.php/10896_3297681_1 (1240 words)

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