Derek Taubert wrote:
The sd cache_type is set to "write back" for this drive. I suspect that
the reads are coming from the block driver attempting to fill lines.
# cat /sys/bus/scsi/devices/0:0:0:0/scsi_disk:0:0:0:0/cache_type
write back
That's the cache inside the harddrive. To libata and SCSI, it's
(almost) transparent and doesn't cause such problems.
Also, a problem here:
# echo "none" > /sys/bus/scsi/devices/0:0:0:0/scsi_disk:0:0:0:0/cache_type
echo: write error: invalid argument
dmesg says:
sda: Current: sense key: Illegal Request
Additional sense: Invalid field in cdb
libata doesn't support that sysfs node (yet).
--
tejun
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