Patrol read, Patrol read feature – Dell PowerEdge RAID Controller 6E User Manual
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About PERC 6 and CERC 6/i Controllers
Automatic Replace Member with Predicted Failure
A Replace Member operation can occur when there is a SMART predictive
failure reporting on a drive 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 drive needs to be a hot spare that qualifies as
a rebuild drive. 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 drive that was
originally a hot spare (that was used in a rebuild), and a new drive added for
the Replace Member operation as the target drive, 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 77.
NOTE:
For information on manual Replace Member, see "Replacing an Online
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 OpenManage storage
management application can be used to start Patrol Read and change its
behavior.
Patrol Read Feature
The following is an overview of Patrol Read behavior:
1 Patrol Read runs on all disks on the controller that are configured as part
of a virtual disk, including hot spares.
2 Patrol Read does not run on physical disks that are not part of a virtual disk
or are in Ready state.
Dell_PERC6.2_UG.book Page 38 Wednesday, June 24, 2009 6:08 PM