On Fri, 2008-01-25 at 21:59 +0100, Halim Issa wrote: > This is my first post to any of the vger lists. I have tried to comply with > the list recommendations and be specific while to the point. If anything is > missing, kindly let me know. > > I am having trouble getting the scsi-subsystem on an IBM x336 eServer with LSI > Logic53c1030 SCSI RAID controller to recognize the write cache on my > harddrives/controller. It reports: > > sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support > DPO or FUA. This statement is really simply reporting what the INQUIRY data of the device is telling it ... we don't actually massage the data in any way. However ... The INQUIRY strings for this device are: scsi 0:0:0:0: Direct-Access LSILOGIC 1030 IM 1000 PQ: 0 ANSI: 2 So it's basically a RAID-1 volume manufactured by the LSI, not your actual device. The INQUIRY strings returned by such RAID volumes usually bear no relation to the underlying devices. The "cache" hear would be referring to the RAID controller cache, not the disk cache. Likewise DPO and FUA refer to what the RAID controller can support, not the disk. James - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
