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ADAC Ultra2 S466 Hardware Guide
14
Disk Rebuild
You rebuild a disk drive by recreating the data that had
been stored on the drive before the drive failed.
Rebuilding can be done only in arrays with data
redundancy such as RAID level 1, 3, 5, 10, 30, and 50.
Standby (warm spare) rebuild is employed in a mirrored
(RAID 1) system. If a disk drive fails, an identical drive is
immediately available. The primary data source disk drive
is the original disk drive.
A hot spare can be used to rebuild disk drives in RAID 1,
3, 5, 10, 30, or 50 systems. If a hot spare is not available,
the failed disk drive must be replaced with a new disk drive
so that the data on the failed drive can be rebuilt.
The ADAC Ultra2 S466 controller automatically and
transparently rebuilds failed drives with user-definable
rebuild rates. If a hot spare is available, the rebuild starts
automatically when a drive fails. ADAC Ultra2 S466
automatically restarts the system and the rebuild if the
system goes down during a rebuild.
Rebuild Rate The rebuild rate is the fraction of the compute cycles
dedicated to rebuilding failed drives. A rebuild rate of 100
percent means the system is totally dedicated to rebuilding
the failed drive.
The ADAC Ultra2 S466 rebuild rate can be configured
between 0% and 100%. At 0%, the rebuild is only done if
the system is not doing anything else. At 100%, the rebuild
has a higher priority than any other system activity.
Physical Array A RAID array is a collection of physical disk drives
governed by the RAID management software. A RAID
array appears to the host computer as one or more logical
drives.