[mythtv-users] Using spindown with SCSI RAID5?
george_mythusers at mari1938.org
Thu Jun 26 12:44:56 UTC 2008
> 2008/6/25 George Mari <george_mythusers at mari1938.org>:
>> Anyone out there had any success with spinning down SCSI disks in a
>> software RAID5 array for power saving?
>> I tried to spin down one of my 4 disks in a RAID5 array, using the command:
>> sdparm --command=stop /dev/sdi
>> This spun the drive down (good), but it also kicked it out of the array.
>> What I'm trying to do is just have it power down somehow after a certain
>> time being idle, and then just spin up again when accessed without
>> breaking the but it seems that SCSI drives don't have all the power
>> management options that PATA or SATA drives do. (Or maybe just my
>> particular SCSI drives don't have these features...)
>> I'd love to hear from anyone with specific experience with trying to do
>> this with SCSI drives - thanks.
Silvestro Roberto wrote:
> I think you can spin down only spare disks in the array!
Well, I have read that the spare disks for a RAID5 or RAID6 can be spun
But I have a small RAID0 array on my desktop made from 3 SATA laptop
drives that I use for editing and transcoding home movies. Through no
intervention on my part, the drives spin down after not being used for a
while, and whenever I access the filesystem on that array, there is a
pause of maybe 2 seconds while the drives spin up, and then the array is
So it seems like it could be done, but I'm just trying to figure out if
only certain hardware supports the "spindown-without-breaking-the-array"
feature, or if there is some way to do it I am not aware of.
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