[DRBD-user] drbd hanging on file write

Lars Ellenberg Lars.Ellenberg at linbit.com
Thu Mar 16 22:39:50 CET 2006

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

/ 2006-03-16 14:04:41 -0500
\ Monty Taylor:
> Lars Ellenberg wrote:
> >> I just set up a drbd replication pair and shipped it to the colo.
> >> It was working great.
> > so you did local tests first, and all was working as expected?
> Yes.
> >now. your report is somewhat unspecific.
> >anyways, when I read your last sentence "machine is hung",
> >this might point to a deadlock that could occur when stressing the box.
> Fair enough. I think the hang was that block device was busy and
> couldn't be unmounted, and so when I tried to shutdown the machine it
> blocked waiting for the fs to unmount.

> >please report your findings.
> I will when I get another test machine and 2.6.15 again, which should
> be next week. If there's a possible known deadlock, I bet that's what
> I ran into. On the other hand, is the default value for on-disconnect
> reconnect or freeze_io? Because if it's freeze_io I would maybe see
> that being what happened, too.

freeze_io is mentioned, but not yet configurable.
the kernel side implementation is missing from drbd 0.7 ...
default would be reconnect.

> I'll keep trying to isolate for you. I think we're going to be using
> drbd a bit more as part of our Professional Services offerings to some
> clients, so it'll be nice to know where the problem actually sits.

sounds interessting!


: Lars Ellenberg                                  Tel +43-1-8178292-0  :
: LINBIT Information Technologies GmbH            Fax +43-1-8178292-82 :
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