Connecting Hardware Devices
Small Computer Systems Interface (SCSI)
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RAID 5 - Disk Striping With Distributed Parity
Uses parity to generate redundancy data from two or more parent data sets. Parity
storage is rotated or distributed through the stripe of the disk array. Parity storage
provides an advantage for applications that require high read-request rates with low
write-request rates such as transaction processing, office automation, and online
customer service because parity generation can slow down write operations
considerably. Three or more disks are required to configure this type of RAID level.
To enable automatic recovery of a faulty disk array, you must specify the spare device in
the RAID configuration. If a drive fails, the RAID controller will automatically initiate a
recovery sequence, bringing the spare device into service. For more information, refer to
the user’s guide that came with your RAID controller.
RAID 10 - Disk Striping and Disk Mirroring
RAID 10 is a combination of RAID 0 and RAID 1. RAID 10 has mirrored drives. RAID 10
breaks up data into smaller blocks, and then stripes the blocks of data to each RAID 1
raid set. Each RAID 1 raid set duplicates its data to its other drive. The size of each block
is determined by the stripe size parameter, which is set during the creation of the RAID
set. RAID 10 can sustain one to four drive failures while maintaining data integrity, if each
failed disk is in a different RAID 1 array.
RAID 10 works best for data storage that must have 100% redundancy of mirrored
arrays, and that also needs the enhanced I/O performance of RAID 0 (striped arrays).
RAID 10 works well for medium-sized databases or any environment that requires a
higher degree of fault tolerance and moderate-to-medium capacity. RAID 10 provides
both high data transfer rates and complex data redundancy. RAID 10 requires twice as
many drives as all other RAID levels except RAID 1(Minimum number of drives is 4: 2
Disk Striping and Mirroring).
RAID Failures
This section describes how the RAID configuration responds when a component failure
occurs.
The number of hard disk drives that can fail without affecting system operation depends
on the RAID configuration of your server. If a hard disk drive fails, replace it as quickly as
possible and rebuild the disk array.
Striping Configuration Failure (RAID 0)
A striping hard disk drive fault represents a critical RAID failure. To recover from a
striping failure, replace the failed drive, then completely rebuild the RAID array, and
restore the data from backup.
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