How to Read Raid Drive on Non-raid Computer

The most widespread standard for configuring multiple hard drives is RAID (Redundant Array of Independent Disks), which comes in a number of standard configurations and non-standard configurations. Non-RAID drive architectures also exist, and are referred to by acronyms with similarity to RAID, several tongue-in-cheek:

• Span or BIG: a simple concatenation of multiple drives. Such a concatenation is sometimes likewise chosen JBOD, merely this usage is proscribed in conscientious utilize due to ambiguity with the alternative meaning only cited.^{[ citation needed ]}
• MAID: a system using hundreds to thousands of hard drives for nearline storage

Contents

• 1 Chain (Span, BIG)
  • ane.1 Implementations
• 2 MAID
• 3 See also
• four References

Concatenation (SPAN, BIG)

Principal article: Spanned volume

Diagram of a SPAN/Large ("JBOD") setup.

Concatenation or spanning of disks is not 1 of the numbered RAID levels, but information technology is a popular method for combining multiple physical disk drives into a single virtual disk. It provides no data back-up. Disks are merely concatenated together, finish to beginning, so they appear to be a unmarried large deejay. It may be referred to every bit SPAN or BIG (meaning only the words "bridge" or "big", non equally acronyms).

Concatenation is sometimes used to plough several odd-sized drives into one larger useful drive, which cannot exist done with RAID 0.^{[ citation needed ]}

In the diagram to the right, information are concatenated from the cease of disk 0 (block A63) to the beginning of disk 1 (block A64); finish of disk 1 (block A91) to the beginning of deejay ii (block A92). If RAID 0 were used, then deejay 0 and disk 2 would be truncated to 28 blocks, the size of the smallest disk in the assortment (disk 1) for a full size of 84 blocks.

Implementations

The initial release of Microsoft's Windows Abode Server employs drive extender technology, whereby an array of independent disks are combined by the Os to form a single puddle of bachelor storage. This storage is presented to the user equally a single set of network shares. Bulldoze extender technology expands on the normal features of chain by providing information redundancy through software – a shared binder tin be marked for duplication, which signals to the OS that a copy of the data should exist kept on multiple concrete disks, whilst the user will merely e'er see a single example of their data. ^[1] This characteristic was removed from Windows Home Server in its subsequent major release. ^[2]

Greyhole, a disk-pooling application, implements what it calls a "storage pool". This pool is created by presenting to the user, through Samba shares, a logical drive that is as large as the sum of all concrete drives that are function of the puddle. Greyhole besides provides data redundancy through software - the user can configure, per share, the number of file copies that Greyhole is to maintain. Greyhole will then ensure that for each file in such shares, the correct number of extra copies are created and maintained on multiple physical disks. The user will only ever see one copy of each file. ^[3]

MAID

A massive assortment of idle disks (more commonly known as a MAID) is a system using hundreds to thousands of difficult drives for nearline storage of data. MAID is designed for 'Write In one case, Read Occasionally' (WORO) applications. In a MAID each drive is only spun up on demand as needed to access the data stored on that bulldoze.^{[ citation needed ]}

Compared to RAID technology a MAID has increased storage density, and decreased cost, electrical ability, and cooling requirements. Nonetheless, these advantages are at the cost of much increased latency, significantly lower throughput, and decreased redundancy. Depression drive utilization rates may really reduce reliability in consumer-oriented big PATA and SATA drives. ^[4] Drives designed for multiple spin-upwardly/down cycles (eastward.g. laptop drives) are significantly more expensive. ^[five] Latency may be as high as tens of seconds. ^{[half dozen]} MAID tin supplement or replace tape libraries in hierarchical storage management.

To let a more gradual tradeoff betwixt access time and power savings, some MAIDs such equally Nexsan's AutoMAID incorporate disks capable of spinning downwards to a lower speed. ^[7]

Large calibration deejay storage systems based on MAID architectures allow dumbo packaging of drives and are designed to have only 25% of disks spinning at any one fourth dimension. ^[6]

Run across also

• Nested RAID levels
• Non-standard RAID levels
• Standard RAID levels

References

1. ^ "Windows Abode Server Drive Extender Technical Brief". Microsoft.com. http://www.microsoft.com/downloads/details.aspx?FamilyID=40C6C9CC-B85F-45FE-8C5C-F103C894A5E2&displaylang=en . Retrieved 2009-03-12.
2. ^ "Windows Home Server code name "Vail"– Update". http://windowsteamblog.com/windows/b/windowshomeserver/archive/2010/eleven/23/windows-home-server-code-proper name-vail-update.aspx.
3. ^ "Greyhole project on Google Code". Guillaume Boudreau. http://lawmaking.google.com/p/greyhole/.
4. ^ Harris, Rick (2007-02-xix). "Failure Trends in a Large Disk Bulldoze Population", Google, Retrieved on 2012-08-28
5. ^ SGI (2012). "Enterprise MAID Quick Reference Guide". http://www.sgi.com/pdfs/4223.pdf . Retrieved 28 August 2012.
6. ^ ^{a b} Melt, Rick (2004-07-12). "Backup budgets take it MAID with cheap disk" Retrieved on 2008-07-15
7. ^ Nexsan (2011). "AutoMAID Free energy Saving Engineering science". http://world wide web.nexsan.com/library/automaid.aspx . Retrieved 7 April 2011.

• RAIDON – demonstrating usage of hardware RAID 0, one, JBOD, BIG, and SPAN with no driver and software needed
• CoolDrives – demonstrating usage of JBOD, BIG, and SPAN
• PCGuide – "Simply A Agglomeration Of Disks" (JBOD)

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Source: http://p2k.unkris.ac.id/IT/en/3065-2962/Non-RAID-drive-architectures_12201_p2k-unkris.html

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