one more load-cycle-count problem
Gerrit Kühn
gerrit at pmp.uni-hannover.de
Sun Feb 7 17:55:50 UTC 2010
Hi all,
After being disturbed by the firmware issues of the wd drives causing
exceeding load cycles (see thread "immense delayed write to file system
(ZFS and UFS2), performance issues" in January), I have found some more
problematic drives in the following setup:
4 x 2.5" WDC WD4000BEVT-00ZAT0 in RAIDZ1 configuration attached to a
Supermicro SAS controller:
mpt0 at pci0:2:0:0: class=0x010000 card=0xa38015d9 chip=0x00581000
rev=0x08 hdr=0x00 vendor = 'LSI Logic (Was: Symbios Logic, NCR)'
device = 'SAS 3000 series, 8-port with 1068E -StorPort'
class = mass storage
subclass = SCSI
luna# camcontrol devlist
<ATA WDC WD4000BEVT-0 1A01> at scbus0 target 0 lun 0 (pass0,da0)
<ATA WDC WD4000BEVT-0 1A01> at scbus0 target 1 lun 0 (pass1,da1)
<ATA WDC WD4000BEVT-0 1A01> at scbus0 target 2 lun 0 (pass2,da2)
<ATA WDC WD4000BEVT-0 1A01> at scbus0 target 3 lun 0 (pass3,da3)
The disks appear to load/unload every 10s or so if I do not artificially
keep them busy. Does anyone here have a suggestion how to make this
interval longer or even turn off the unload feature completely?
I tried
luna# camcontrol idle da0 -t 600
(pass0:mpt0:0:0:0): CMD: IDLE: e3 00 00 00 00 40 00 00 00 00 78 00
(pass0:mpt0:0:0:0): CAM Status: CCB request was invalid
luna# camcontrol standby da0 -t 600
(pass0:mpt0:0:0:0): CMD: STANDBY: e2 00 00 00 00 40 00 00 00 00 78 00
(pass0:mpt0:0:0:0): CAM Status: CCB request was invalid
>From /usr/share/misc/scsi_modes I gather that page 26 should contain power
control features, but no avail:
luna# camcontrol modepage da0 -m 26
camcontrol: error sending mode sense command
Any further ideas how to get rid of this "feature"?
cu
Gerrit
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