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Adaptec Storage Management Software User's Guide
Note: Data inconsistencies should not occur under normal
conditions. However, a power failure that interrupts an array
write operation can cause inconsistencies. Making the data
consistent again through the Verify function does not ensure
that the new consistent data is the correct data.
This operation is performed by the RAID controller concurrent
with normal system operation and requires no user or host
computer intervention.
To start data verification on an array, select Verify in the Array
Group Information window.
If any inconsistencies in the data redundancy are found, they are
made consistent.
For RAID 1 arrays, the mirrored drive pairs are compared sector
■
by sector to ensure that both drives contain identical data.
For RAID 5 arrays, parity is recalculated and checked against
■
the stored parity information.
For RAID 0, only a disk media ECC check is performed.
■
Running Verify on an array that is in a degraded state can result in
significantly reduced I/O performance. Although there is no
impact on the host CPU, system I/O performance can be affected
due to increased demand on controller resources. If this is a
concern, use the Background Task Priority feature to assign a
lower-level priority to background processes.
Background Task Priority
You can run a rebuild or verification operation without taking an
array offline. These operations are performed as background tasks
on the RAID controller and are transparent to the host operating
system. However, the controller interleaves I/O from the operating
system with I/O from the background task and this can affect
system performance.
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