how to 'spin down' scsi disks ?

dansawyer · 02-03-2007, 04:03 PM

All,

The system is fc6 with 4 scsi drives on a 2940 controller. My question is - during idle is there a way to cause scsi drives to 'spin down'?

Thanks - Dan

stress_junkie · 02-03-2007, 04:18 PM

Try the hdparm utility.

gilead · 02-03-2007, 04:41 PM

If that doesn't work, the sdparm utility at http://sg.torque.net/sg/sdparm.html looks like it supports spinning the disk down:

Code:

sdparm commands
The '--command=' option allows a command to be sent to the given device. The currently supported commands are:

    * capacity: sends a READ CAPACITY and if successful reports the number of blocks, block length and capacity expressed in MibiBytes (1048576 bytes). Valid for disks and CD/DVD drives with the appropriate media loaded.
    * eject: stops the medium (if it is spinning) and ejects it from the drive. Note that this may be prevented by software in which case use the 'unlock' command first.
    * load: loads the medium and then spins it up
    * ready: reports whether the medium is ready for IO. Ready usually means that it is present and spun up. If the device is not ready then the exit status will be 2 (see exit status section below).
    * sense: reports sense data (from a REQUEST SENSE SCSI command); can include power condition information, a progress indication for a time consuming command (e.g. format) or a report an informational exception (when MRIE=6)
    * start: spin up the medium
    * stop: spin down the medium
    * sync: send a SYNCHRONIZE CACHE SCSI command to the device.
    * unlock: instructs the device to allow medium removal (i.e. an eject). Beware, the OS may have had a good reason for preventing removal of the medium (e.g. it contains a mounted file system). Use at your own risk.