USB external hard drive disconnecting
Ric Moore
wayward4now at gmail.com
Sun Feb 17 03:25:28 UTC 2008
On Fri, 2008-02-15 at 09:44 -0700, Reid Rivenburgh wrote:
> On Fri, Feb 15, 2008 at 9:34 AM, Reid Rivenburgh <reidr at pobox.com> wrote:
> > That made me rethink the idea of using autofs to handle mounting.
> > There were two reasons I wasn't using it:
> >
> > 1. I'm not sure how autofs, with its potential for frequent
> > mounts/unmounts, works with e2fsck. If the USB drive (ext3) is
> > configured to run e2fsck every N mounts, will it be done under autofs?
> > If it does, would autofs just wait until the e2fsck is finished
> > before mounting? I guess the best thing to do in that case would be
> > to configure the filesystem to be checked after some period of time,
> > not after some number of mounts. I'm still not clear on this.
> >
> > 2. The drive would usually be found as /dev/sdd or /dev/sde, but
> > especially with the disconnecting/reconnecting issue where it'd bounce
> > between the two, it wasn't predictable. I thought you had to enter
> > one of them in the autofs config file, but it turns out you can enter
> > the drive's UUID or filesystem label, neither of which change. Cool,
> > that fixes it! Here's my auto.misc entry:
> >
> > disk2 -fstype=ext3 :/dev/disk/by-uuid/a95....
> >
> > You could also use /dev/disk/by-label, but my labels have slashes in
> > them, and the dev path had strange \\x2 characters in them so I went
> > with uuid.
>
> Pardon following up to myself, but something just occurred to me. I
> was thinking that autofs would be beneficial in that it would allow
> the drive to go to sleep, if that's what it was doing. (It gets
> pretty hot when always on, for one thing.) Autofs would just wake it
> up when needed. But now I'm realizing that if it goes to sleep, it'll
> probably disconnect, the kernel will lose any knowledge of it, and
> autofs won't be able to wake it up after all. I guess I still need to
> prevent it from going to sleep. Harumph!
If it's getting hot, might it be under-powered? Maybe a couple of meter
readings would be called for? Ric
--
================================================
My father, Victor Moore (Vic) used to say:
"There are two Great Sins in the world...
..the Sin of Ignorance, and the Sin of Stupidity.
Only the former may be overcome." R.I.P. Dad.
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