[Pacemaker] offtopic scalable block-device
Lars Marowsky-Bree
lmb at suse.com
Fri Mar 16 11:42:03 UTC 2012
On 2012-03-16T11:28:36, Florian Haas <florian at hastexo.com> wrote:
> > is there a reason for integrating ceph with pacemaker? ceph does
> > internal monitoring of OSTs etc anyway, doesn't it?
> Assuming you're referring to OSDs, yes it does. It does automatic
> failover for MDSs (if you use them) and MONs too. But it currently has
> no means of recovering an osd/mds/mon daemon in place when it crashes,
> and that's what those RAs do. Really trivial.
Yes, I need to stop calling them OSTs, but that's what object storage
targets were called before ceph came along ;-) Sorry. Yes, of course, I
mean OSDs.
Would this not be more readily served by a simple while loop doing the
monitoring, even if systemd/upstart aren't around? Pacemaker is kind of
a heavy-weight here.
> The ocf:ceph:rbd RA by contrast serves an entirely different purpose,
> and I currently don't see how _that_ would be replaced by upstart or
> systemd. Unless either of those becomes so powerful (and
> cluster-aware) that we don't need Pacemaker at all anymore, but I
> don't see that happen anytime soon.
Agreed. I was mostly curious about the server-side. Thanks for the
clarification.
Regards,
Lars
--
Architect Storage/HA
SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 21284 (AG Nürnberg)
"Experience is the name everyone gives to their mistakes." -- Oscar Wilde
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