Managing Spares; Understanding How Spares And Failover Work - Adaptec DuraStor 7220SS User Manual

Managing Spares

In This Chapter

Understanding How Spares and Failover Work

Managing Spares Assigned to an Array
Managing the Spare Pool
Enabling Dynamic Spares
Viewing Spare Assignments and Status
Spare Management Guidelines
Understanding How Spares and Failover Work
Storage Manager Pro allows you to assign spare disk drives either
to a specific array or to a spare pool. If the controller detects an
unrecoverable error during I/O, it checks for an available spare
drive that has sufficient free space to handle the failover. Failover is
the process by which the controller rebuilds data on a spare drive
when a drive that is part of an array fails.
Note: Spares only work with redundant array types: mirror
set (RAID 1), RAID 3 set, RAID 4, set RAID 5 set, stripe set
of mirror sets (RAID 0/1), or stripe set of RAID 5 sets
(RAID 0/5).
The free space on the spare must be contiguous and must be equal
to or larger than the used space (space allocated to an array) for one
array on the failed disk drive.
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