Dell UCSA-901 Linux operating system errors, Source disk fails during replace member operation

Source disk fails during replace member operation

Issue:	The source disk fails during the Replace Member operation.
Corrective	If the source data is available from other disks in the virtual disk, the rebuild begins
Action:	automatically on the target disk, using the data from the other disks.

Target disk fails

Issue:	The target disk fails.
Corrective	If the target disk fails, the Replace Member operation aborts.
Action:

General disk fails

Issue:	A general disk fails.
Corrective	If the target disk fails and the Replace Member operation aborts but the source
Action:	data is still available, then the Replace Member operation continues as Replace
	Member.

Linux operating system errors

Virtual disk policy is assumed as write-through error message

Error:	<Date:Time> <HostName> kernel: sdb: asking for cache data
	failed
	<Date:Time> <HostName> kernel: sdb: assuming drive cache: write
	through
Corrective	The error message is displayed when the Linux Small Computer System Interface
Action:	(SCSI) mid-layer asks for physical disk cache settings. The controller firmware
	manages the virtual disk cache settings on a per controller and a per virtual disk
	basis, so the firmware does not respond to this command. The Linux SCSI mid-
	layer assumes that the virtual disk's cache policy is Write-Through. SDB is the
	device node for a virtual disk. This value changes for each virtual disk.
	For more information about Write-Through cache, see Virtual Disk Write Cache
	Policies.
	Except for this message, there is no effect of this behavior on normal operation.
	The cache policy of the virtual disk and the I/O throughput are not affected by this
	message. The cache policy settings for the PERC SAS RAID system remain
	unchanged.

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