[DRBD-user] drbd and unix sockets

Christopher Harrison charrison at inoc.com
Mon May 1 17:58:25 CEST 2006

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

My mistake cp -pr /var/spool/postfix to the drbd partition and change 
/etc/postfix/main.cf queue_directory = to the new drbd location

Christopher Harrison wrote:
> Lars Ellenberg wrote:
>> / 2006-04-28 15:07:48 -0500
>> \ Christopher Harrison:
>>> I love drbd and the ease of use.   Kudos.
>>> Lately I have been having problems with the drbd block device.   The
>>> problem manifests in closing a unix socket on the drbd device device.
>>> The result freezes all io to the drbd devices (both primary and
>>> secondary).   The drbd device lock appears unrecoverable.   I have
>>> found a way to re sync the systems but it requires a reboot of both
>>> machines to re sync the devices.   After the reboot I force the
>>> secondary to be primary and blow away the meta data from the former
>>> primary device.   Only after I destroy the meta data can I  start my
>>> re sync to the former primary.   If I try to re sync with the old meta
>>> data, the previous primary system locks up again when it tries to
>>> become primary again.
>> I seriously doubt that this has anything to do with unix domain sockets.
>> Anything else that may be the cause of your troubles?
>> What exactly do you do to reproduce the problem?
>> In case you have a simple step-by-step starting "from scratch",
>> that leads you intro trouble always, we probably can reproduce this on
>> some testcluster here, which would really help in debugging.
> To reproduce the problem I installed postfix (simple install with FC5 
> and yum) then I copied the /var/lib/postfix directory to the drbd 
> partition changed the postfix config to point the configdirectory and 
> partition-default to the drbd partition.   Then I started postfix. 
> Postfix started just fine and there did not appear to be any problems 
> on startup but when I tried to kill postfix (stop and kill) the system 
> just hung.   I was still able to login and start another ssh session 
> but the system load increased and the situation ensured.
> I hope this helps.
> -Chris
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