Date: Sun, 7 Feb 2010 18:55:45 +0100 From: Gerrit =?ISO-8859-1?Q?K=FChn?= <gerrit@pmp.uni-hannover.de> To: freebsd-stable@freebsd.org Subject: one more load-cycle-count problem Message-ID: <20100207185545.e29108dc.gerrit@pmp.uni-hannover.de>
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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@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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