Users Guide

Target disk fails during replace member operation
Issue: The target disk failure reported during the Replace Member operation, and the Replace Member
operation stops.
Probable Cause: Physical disk failure or physical disk is removed or disconnected.
Corrective
Action:
It is recommended that you replace or check the target drive, and restart the Replace Member
operation or perform the operation on a different target drive.
A member disk failure is reported in the virtual disk which
undergoes replace member operation
Issue: The source and the target drive which is part of Replace Member operation are online, while a different
drive which is a member of the virtual drive reports a failure.
Probable Cause: Physical disk failure or physical disk is removed or disconnected.
Corrective
Action:
A rebuild starts if there any hot-spares configured or you may replace the failed drive. The Replace
Member operation continues as far as the source virtual disk can tolerate the drive failure. If the source
virtual disk fails, the Replace Member is stopped, otherwise the virtual disk continues to be in degraded
state.
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
Action:
The error message is displayed when the Linux Small Computer System Interface (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.
Unable to register SCSI device error message
Error:
smartd[smartd[2338] Device: /dev/sda, Bad IEC (SMART) mode page, err=-5,
skip device smartd[2338] Unable to register SCSI device /dev/sda at line 1
of file /etc/smartd.conf.
Corrective
Action:
This is a known issue. An unsupported command is entered through the user application. User applications
attempt to direct Command Descriptor Blocks to RAID volumes. The error message does not affect the
feature functionality. The Mode Sense/Select command is supported by firmware on the controller.
However, the Linux kernel daemon issues the command to the virtual disk instead of to the driver IOCTL
node. This action is not supported.
74 Troubleshooting