linux-kernel - USB attached SATA disk idle spindown

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Message-ID: <20080624045953.GA24600@miyako.sixapart.com>
Date:	Mon, 23 Jun 2008 21:59:55 -0700
From:	Jonathan Steinert <hachi@...ki.net>
To:	linux-kernel@...r.kernel.org
Subject: USB attached SATA disk idle spindown

Dear list,

I am looking for what the current state of USB SATA timed spindown of-
disks is ata this time. I've been reading documents and mailing lists-
for every possible search I can dream up on the subject. Suggested-
workable solutions include (but are probably not limited to):

$ hdparm -S
    This seems to be the ATA way of telling a disk to spin down, and it
    works in some situations, but doesn't appear to work on USB attached
    disks under 2.6.25

$ sdparm
    This is suggested in a small number of locations. Most of which have
    examples on how to disable STANDBY on a handful of devices. I am
    unable to find any evidence that it can actually be used to enable
    power saving.

$ scsi_spin
    Requires the disk to be unmounted, and I can't find anything saying
    that this is how the world is supposed to be.-

I'm hoping that perhaps I'm missing something from this list.

I don't really know whether this is a topic for the scsi people, or the-
SATA people, or the USB people. So I'm asking here instead to try and
get my first hints from the parent group.

Thanks in advance,

hachi

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