Perhaps Cristian is thinking of the clone from journal work that we were talking about last year: http://wiki.ceph.com/Planning/Sideboard/osd%3A_clone_from_journal_on_btrfs I think we never did much beyond Sage's test branch, and it didn't seem to help as much as you would hope. Speaking of which, I believe this would open us up to horrible journal fragmentation, especially with rbd on btrfs. Mark On 07/28/2014 12:37 PM, Gregory Farnum wrote: > It still helps; the journal does just as much work. Less of the work > *can* be in the critical path for IO, but for most of the applications > it will be. > -Greg > Software Engineer #42 @ http://inktank.com | http://ceph.com > > > On Sat, Jul 26, 2014 at 2:18 AM, Cristian Falcas > <cristi.falcas at gmail.com> wrote: >> Hello, >> >> I'm using btrfs for OSDs and want to know if it still helps to have the >> journal on a faster drive. From what I've read I'm under the impression that >> with btrfs journal, the OSD journal doesn't do much work anymore. >> >> Best regards, >> Cristian Falcas >> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users at lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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