On 05/23/2014 04:09 PM, Dan Van Der Ster wrote:
Hi,
I think you’re rather brave (sorry, foolish) to store the mon data dir in
ramfs. One power outage and your cluster is dead. Even with good backups of the
data dir I wouldn't want to go through that exercise.
Agreed. Foolish. I'd never do that.
Saying that, we had a similar disk-io-bound problem with the mon data dirs, and
solved it by moving the mons to SSDs. Maybe in your case using the cfq io
scheduler would help, since at least then the OSD and MON processes would get
fair shares of the disk IOs.
Anyway, to backup the data dirs, you need to stop the mon daemon to get a
consistent leveldb before copying the data to a safe place.
I wrote a blog about this:
http://blog.widodh.nl/2014/03/safely-backing-up-your-ceph-monitors/
Wido
Cheers, Dan
-- Dan van der Ster || Data & Storage Services || CERN IT Department --
On 23 May 2014, at 15:45, Fabian Zimmermann <f.zimmerm...@xplosion.de> wrote:
Hello,
I’m running a 3 node cluster with 2 hdd/osd and one mon on each node.
Sadly the fsyncs done by mon-processes eat my hdd.
I was able to disable this impact by moving the mon-data-dir to ramfs.
This should work until at least 2 nodes are running, but I want to implement
some kind of disaster recover.
What’s the correct way to backup mon-data - if there is any?
Thanks,
Fabian
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Wido den Hollander
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