Users Guide
Target disk fails
Issue: The target disk fails.
Corrective Action: If the target disk fails, the Replace Member operation aborts.
General disk fails
Issue: A general disk fails.
Corrective Action: If the target disk fails and the Replace Member operation aborts but the source 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 Action: The error message is displayed when the Linux Small Computer System Interface (SCSI) mid-layer asks for
physical disk cache settings. The controller rmware manages the virtual disk cache settings on a per controller
and a per virtual disk basis, so the rmware 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 eect of this behavior on normal operation. The cache policy of the virtual disk
and the I/O throughput are not aected 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 aect the feature
functionality. The Mode Sense/Select command is supported by rmware 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.
110 Troubleshooting