On Thu, Apr 8, 2010 at 9:02 AM, Matija Nalis
<mnalis+bac...@carnet.hr<mnalis%2bbac...@carnet.hr>
> wrote:
> On Tue, Apr 06, 2010 at 08:40:20AM -0600, Robert LeBlanc wrote:
> > I've tried in the past to do exactly this. Bacula will usually spit out
> an
> > error that the tape could not be moved or in rarer situations say the
> drive
> > is not there. I then shut down bacula-sd and try to run the mt eject
> command
> > I I usually get back about ten lines that describe the error, but it does
> > really make sense. Sometimes the drive doesn't appear as a device on the
> > system any more. As far as the tape library, the Overland Neo 8000 most
> of
>
> [...]
>
> > the time says soft removal error on the screen and will keep saying that
> if
> > I try to have the library remove it. There is no easy way to get to the
> > hardware eject button as the library is fully enclosed.
>
> It looks like the drive gets confused if it gets commands too fast
> (and/or while it is still processing previous commands)... Anyway, it
> looks like problem outside bacula (probably either the kernel, or a
> drive firmware, or both are at error).
>
> > drives and our LTO-4 drive. The only thing that I can think of is that
> > bacula is trying to take some shortcuts (issuing a command to move the
> tape
> > and expecting the tape library to correctly rewind the tape, eject and
> then
> > move it and maybe bacula is not quiet letting go of the drive fast enough
> > and there gets a deadlock between the drive controlled by Bacula and the
> > library trying to control it), or there is a kernel/driver problem.
>
> Only thing bacula does is execute mtx-changer script; it is the
> scripts responsibility to does everything needed for your drive /
> changer combination. The default script is usually good, but you may
> need to tailor it for your needs (if it needs manual rewind before
> offline, or things like that).
>
> > I've set the offline=1 in mtx-changer.conf and that seems to help a
> little,
> > I've still encountered some drive unmouting issues, but nothing that
> bacula
> > hasn't been able to recover from on it's own or with very little manual
> > intervention.
>
> I run mine (IBM3584) with:
> offline=1
> offline_sleep=2
> load_sleep=20
>
> I do recall having sporadic issues with load_sleep of just a 2-3
> seconds, so I've put it to 20 to allow the drive to settle fully
> before issuing a bunch of "mt status" to it in wait_for_drive().
>
> > I was pretty sure the messages were informational, I'm glad that someone
> can
> > confirm that. I'll keep working on the problem to see what I can come up
> > with. If there is a better way to tell Bacula to be stupid slow with
> unmount
> > and mount requests, that may help me find where in the process things are
> > getting hung up.
>
> Well, you can put (in 5.0.1 at least) offline_sleep and load_sleep to
> 30 seconds or more for example, that might help if drive is getting
> confused while receiving commands too fast.
>
> On older versions (3.0.x or 2.4 ?) you can edit the mtx-changer shell
> script itself, IIRC it had commented out "sleep" statements at right
> places already...
>
Thanks, this is helpful, I'll give these a try.
Robert LeBlanc
Life Sciences & Undergraduate Education Computer Support
Brigham Young University
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