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Automatic Replace Member with Predicted Failure
A Replace Member operation can occur when there is a SMART predictive
failure reporting on a physical disk in a virtual disk. The automatic Replace
Member is initiated when the first SMART error occurs on a physical disk
that is part of a virtual disk. The target disk needs to be a hot spare that
qualifies as a rebuild disk. The physical disk with the SMART error is marked
as failed only after the successful completion of the Replace Member. This
avoids putting the array in degraded status.
If an automatic Replace Member occurs using a source disk that was
originally a hot spare (that was used in a rebuild), and a new disk added for
the Replace Member operation as the target disk, the hot spare reverts to the
hot spare state after a successful Replace Member operation.
NOTE: To enable the automatic Replace Member, use the Dell OpenManage
storage management application. For more information on automatic Replace
Member, see "Dell OpenManage Storage Management" on page 51. For information
on manual Replace Member, see "Replacing an Online Physical Disk" on page 83.
Patrol Read
The Patrol Read feature is designed as a preventative measure to ensure
physical disk health and data integrity. Patrol Read scans for and resolves
potential problems on configured physical disks. The Dell OpenManage
storage management application can be used to start Patrol Read and
change its behavior.
The following is an overview of Patrol Read behavior:
•
Patrol Read
runs on all disks on the controller that are configured as
part of a virtual disk, including hot spares.
•
Patrol Read
does not run on physical disks that are not part of a virtual disk
or are in
Ready
state.
•
Patrol Read
adjusts the amount of controller resources dedicated to
Patrol Read
operations based on outstanding disk I/O. For example,
if the system is busy processing I/O operation, then
Patrol Read
uses
fewer resources to allow the I/O to take a higher priority.