[rsyslog] Development of failsafe disk based queue

[Rainer Gerhards]

One thing I forgot to mention: a pure disk queue (not a disk-assisted
one) gets you as close to your goal as possible (well, mostly - we
could, at a considerable performance expense, require synced writing).
With that case, all data is immediately stored on disk. You can
configure it to also write the meta data out immediately (and again with
sync, not yet supported). However, you still have a window of exposure,
for example if the power loss happens right in the middle of when the
disk actually writes data to the disk sector.

I still wonder why this scenario would be useful to address...

Rainer

On Wed, 2008-10-01 at 12:00 +0200, David Ecker wrote:
> Hi,
> 
> I am looking for a failsafe solution to store syslog messages localy
> until they could be send later. I already looked at the disk based
> memory queue and the disk based queue. Both queue's don't work if you
> just power down the system immediatly actually loosing the whole queue.
> I already looked at queue.c and it seemed to me that both queues were
> not designed for that kind of failure, but I could be wrong there. Since
> an immediate power down of the system is the major failure which will
> occure pretty often I need to create a soltution there.
> 
> Did you already start to develop something addressing that problem?
> Could you help me extend rsyslog (3.18.4) so that I can develop a new
> queue myself? I would contribute the code to the rsyslog project if you
> would like afterwards.
> 
> bye
> David Ecker
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