Neil Brown wrote:
On Thursday June 22, marc@xxxxxxxxxxx wrote:
Marc L. de Bruin wrote:
Situation: /dev/md0, type raid1, containing 2 active devices
(/dev/hda1 and /dev/hdc1) and 2 spare devices (/dev/hde1 and /dev/hdg1).
Those two spare 'partitions' are the only partitions on those disks
and therefore I'd like to spin down those disks using hdparm for
obvious reasons (noise, heat). Specifically, 'hdparm -S <value>
<device>' sets the standby (spindown) timeout for a drive; the value
is used by the drive to determine how long to wait (with no disk
activity) before turning off the spindle motor to save power.
However, it turns out that md actually sort-of prevents those spare
disks to spindown. I can get them off for about 3 to 4 seconds, after
which they immediately spin up again. Removing the spare devices from
/dev/md0 (mdadm /dev/md0 --remove /dev/hd[eg]1) actually solves this,
but I have no intention actually removing those devices.
How can I make sure that I'm actually able to spin down those two
spare drives?
This is fixed in current -mm kernels and the fix should be in 2.6.18.
NeilBrown
Thanks Neil for your quick reply. Would it be possible to elaborate a
bit on the problem and the solution? I guess I won't be on 2.6.18 for
some time...
Marc.
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