Hi,
Another data point for this issue:
r...@fig:~ # hdparm -I /dev/sdb | head -7
/dev/sdb:
ATA device, with non-removable media
Model Number: ST3250310NS
Serial Number: 9SF1ER28
Firmware Revision: MA08
r...@fig:~ # getSystemId
Libsmbios: 2.0.3
System ID: 0x02A5
Service Tag: 4MLJL4J
Express Service Code: 10073570995
Product Name: PowerEdge R210
BIOS Version: 1.1.4
Vendor: Dell Inc.
Is Dell: 1
r...@fig:~ # hdparm -t /dev/sdb
/dev/sdb:
Timing buffered disk reads: 120 MB in 3.02 seconds = 39.74 MB/sec
r...@fig:~ # hdparm -t /dev/sdb
/dev/sdb:
Timing buffered disk reads: 130 MB in 3.01 seconds = 43.23 MB/sec
r...@fig:~ # hdparm -t /dev/sdb
/dev/sdb:
Timing buffered disk reads: 124 MB in 3.01 seconds = 41.16 MB/sec
r...@fig:~ # cat /sys/block/sdb/device/queue_depth
31
r...@fig:~ # echo 2 > /sys/block/sdb/device/queue_depth
r...@fig:~ # hdparm -t /dev/sdb
/dev/sdb:
Timing buffered disk reads: 282 MB in 3.02 seconds = 93.42 MB/sec
r...@fig:~ # hdparm -t /dev/sdb
/dev/sdb:
Timing buffered disk reads: 316 MB in 3.00 seconds = 105.20 MB/sec
r...@fig:~ # hdparm -t /dev/sdb
/dev/sdb:
Timing buffered disk reads: 316 MB in 3.01 seconds = 105.02 MB/sec
r...@fig:~ # echo 31 > /sys/block/sdb/device/queue_depth
r...@fig:~ # hdparm -t /dev/sdb
/dev/sdb:
Timing buffered disk reads: 130 MB in 3.00 seconds = 43.33 MB/sec
r...@fig:~ # hdparm -t /dev/sdb
/dev/sdb:
Timing buffered disk reads: 124 MB in 3.00 seconds = 41.28 MB/sec
r...@fig:~ # hdparm -t /dev/sdb
/dev/sdb:
Timing buffered disk reads: 128 MB in 3.02 seconds = 42.45 MB/sec
This does actually hit us in real-world scenarios - e.g. period RAID
integrity checks. Any feadback from Dell as to whether this issue is
going to be addressed by Dell/Seagate? Seagate seem to have fixed this
bug in other non-Dell firmware revisions.
Thanks,
Tim.
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