Dell PERC13 and PERC12 User’s Guide PERC H975 Series and PERC H965 Series cards
Virtual disk policy is assumed as write-through
- 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 and read-ahead policy. 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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