Disk Redundancy Research

Topics: RAID, Computer data storage, Backup Pages: 2 (448 words) Published: August 2, 2014
Unit 2 Assignment 1
Disk Redundancy Research

1.RAID stands for Redundant Array of Inexpensive Disks and at the simplest level it combines many disks into one logical drive. 2.We use RAID to avoid the lagging of computer performance. The basic idea of RAID combined multiple small, inexpensive disk drives into an array of disk drive which yields performance exceeding that of a large expensive drive. Moreover, this array of disk drive appears to the computer as a single logical storage unit. 3.Define the following types of RAID:

a.RAID 0: Striped Set – a RAID 0 setup splits the data evenly across 2 or more disks. It’s not one of the original RAID levels because it’s not redundant. If one disk goes down your sever has to be restored from the backup. This level is commonly referred as “striping”. b.RAID 1: Mirrored Set – a RAID 1 setup creates an exact copy of data on 2 or more disks. A typical setup just has 2 drives that are setup to mirror data. If one drive goes down, the system can still be functional until the replacement drive can be installed. c.RAID 5: Block-level Striped Set with Parity – a RAID 5 setup uses block-level striping with parity data distributed across all disks in the RAID array. One drive fail the system still be functional. RAID 5 also improves write and read speed while using the availability disk space efficiently. d.RAID 6: Block-level Striped Set with Double Distributed Parity – double distributed parity provides fault tolerance up to two failed drives. This makes larger RAID group more practical, especially for high-availability systems, as larger drives take more time to restore. With a RAID 6 array, using drives from multiple sources and manufacturers, it is possible to mitigate most of the problems associated with RAID 5. 4.Even though RAID 0 offers no redundancy but it still can be used because RAID 0 gives more storage capacity in that data is spread across multiple disks. 5.RAID 1 I make the s the most...
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