On Tue, 25 Oct 2011, Christoph Hellwig wrote:
> On Mon, Oct 24, 2011 at 10:06:49AM -0700, Sage Weil wrote:
> > > - When I run ceph with btrfs snaps disabled, the situation is getting
> > > slightly better. I can run an OSD for about 3 days without problems,
> > > but then again the load increases. This time, I can see that the
> > > ceph-osd (blkdev_issue_flush) and btrfs-endio-wri are doing more work
> > > than usual.
> >
> > FYI in this scenario you're exposed to the same journal replay issues that
> > ext4 and XFS are. The btrfs workload that ceph is generating will also
> > not be all that special, though, so this problem shouldn't be unique to
> > ceph.
>
> What journal replay issues would ext4 and XFS be exposed to?
It's the ceph-osd journal replay, not the ext4/XFS journal... the #2
item in
http://marc.info/?l=ceph-devel&m=131942130322957&w=2
sage
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