Dell UCPM-800 Virtual Disk Fails During Rebuild Using a Global Hot Spare, Controller cache issues

must make sure a physical disk with enough storage in the subsystem is set as a hot spare for rebuilding the physical disk.

Virtual Disk Fails During Rebuild Using A Global Hot Spare

Issue:	A virtual disk fails during rebuild while using a global hot spare. The global hot
	spare reverts to Hotspare state and the virtual disk is in Failed state.
Corrective	Check whether the original virtual disk has failed or has been removed.
Action:

Virtual Disk Fails During Rebuild Using A Dedicated Hot Spare

Issue:A virtual disk fails during rebuild while using a dedicated hot spare. The dedicated hot spare goes to Ready state and the virtual disk goes to Failed state.

Description: Check whether the original virtual disk has failed or has been removed.

Physical disk takes a long time to rebuild

Issue:A physical disk is taking longer than expected to rebuild.

Description: A physical disk takes longer to rebuild when under high stress. For example, there is one rebuild I/O operation for every five host I/O operations. You cannot add a second virtual disk to a disk group while the virtual disk in that disk group is undergoing a rebuild. The firmware does not allow you to create a virtual disk using the free space available in a disk group if a physical disk in a virtual disk group is undergoing a rebuild operation.

Controller cache issues

For certain conditions virtual drives will be either not configured to write-back caching or if configured, it will transition to write-through caching. The status of write-back caching can be viewed through CMC storage logs.

The following table details the conditions and the corrective actions.

Table 3. Conditions and the corrective actions

Conditions	Actions
During the VRTX power on with no failing	There is no intervention required.
conditions, the virtual drive temporarily transitions
to write-through as part of the Shared PERC 8
firmware initialization. After the system power on,
the virtual drive transitions back to write-back.

During VRTX power on or reset, unresolved pinned cache is present.

Perform the following:

•Insert the drives that caused the virtual drive to go offline, that resulted in the cache being pinned to recover the virtual drive.

OR

•Clear the pinned cache through CMC.

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