Seagate ST3250310NS firmware bug - Dell R210 poor sequential read performance

Tim Small tim at seoss.co.uk
Wed Apr 21 03:15:54 CDT 2010


Hi,

Another data point for this issue:

root at fig:~ # hdparm -I /dev/sdb | head -7

/dev/sdb:

ATA device, with non-removable media
        Model Number:       ST3250310NS
        Serial Number:      9SF1ER28
        Firmware Revision:  MA08
root at 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

root at fig:~ # hdparm -t /dev/sdb

/dev/sdb:
 Timing buffered disk reads:  120 MB in  3.02 seconds =  39.74 MB/sec
root at fig:~ # hdparm -t /dev/sdb

/dev/sdb:
 Timing buffered disk reads:  130 MB in  3.01 seconds =  43.23 MB/sec
root at fig:~ # hdparm -t /dev/sdb

/dev/sdb:
 Timing buffered disk reads:  124 MB in  3.01 seconds =  41.16 MB/sec
root at fig:~ # cat /sys/block/sdb/device/queue_depth
31
root at fig:~ # echo 2 > /sys/block/sdb/device/queue_depth
root at fig:~ # hdparm -t /dev/sdb

/dev/sdb:
 Timing buffered disk reads:  282 MB in  3.02 seconds =  93.42 MB/sec
root at fig:~ # hdparm -t /dev/sdb

/dev/sdb:
 Timing buffered disk reads:  316 MB in  3.00 seconds = 105.20 MB/sec
root at fig:~ # hdparm -t /dev/sdb

/dev/sdb:
 Timing buffered disk reads:  316 MB in  3.01 seconds = 105.02 MB/sec
root at fig:~ # echo 31 > /sys/block/sdb/device/queue_depth
root at fig:~ # hdparm -t /dev/sdb

/dev/sdb:
 Timing buffered disk reads:  130 MB in  3.00 seconds =  43.33 MB/sec
root at fig:~ # hdparm -t /dev/sdb

/dev/sdb:
 Timing buffered disk reads:  124 MB in  3.00 seconds =  41.28 MB/sec
root at 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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