Hi Sage, Thanks for your reply! Actually what I want is to replace the journal disk only, while I want to keep the OSD FS intact. I have 4 OSDs on a node of 4 spinning disks (sdb, sdc, sdd, sde) and 2 SSDs (sdf and sdg) osd.28 on /dev/sdb, journal on /dev/sdf1 osd.29 on /dev/sdc, journal on /dev/sdf2 osd.30 on /dev/sdd, journal on /dev/sdg1 osd.31 on /dev/sde, journal on /dev/sdg2 I want to replace the SSDs (sdf and sdg) without losing the data on the OSD. I believe ceph-disk prepare will destroy the data on the OSD? - set noout - stop the osds - flush the journal - replace journal SSDs - recreate the journal (for the existing osds) - start the osds - unset noout Is it possible? Looking forward to your reply, thank you. Cheers. On Fri, May 9, 2014 at 12:12 AM, Sage Weil <sage at inktank.com> wrote: > Hi Indra, > > The simplest way to do the fs and journal creation is to use the ceph-disk > tool: > > ceph-disk prepare FSDDISK JOURNALDISK > > For example, > > ceph-disk prepare /dev/sdb # put fs and journal on same disk, or > ceph-disk prepare /dev/sdb /dev/sdc # fs on sdb, journal on (a new part > on) sdc > > It will create the partitions, label them, and then create the (by > default, XFS) fs and initialize the journal. After that, udev magic will > take care of all the mounting and starting of daemons for you. > > sage > > > On Fri, 9 May 2014, Indra Pramana wrote: > > > Hi Sage, > > Sorry to chip you in, do you have any comments on this? Since I noted > you advised Tim Snider on > > similar situation before. :) > > > > http://www.spinics.net/lists/ceph-users/msg05142.html > > > > Looking forward to your reply, thank you. > > > > Cheers. > > > > > > > > On Wed, May 7, 2014 at 11:31 AM, Indra Pramana <indra at sg.or.id> wrote: > > Hi Craig and all, > > > > I checked S?bastien Han's blog post, it seems that the way how the > journal was mounted is a > > bit different, is it because the article was based on older version of > Ceph? > > > > ==== > > $ sudo mount /dev/sdc /journal > > > > $ ceph-osd -i 2 --mkjournal > > 2012-08-16 13:29:58.735095 7ff0c4b58780 -1 created new journal > /journal/journal for > > object store /srv/ceph/osd2 > > > > $ sudo service ceph start osd.2 > > === osd.2 === > > Starting Ceph osd.2 on ceph03... > > starting osd.2 at :/0 osd_data /srv/ceph/osd2 /journal/journal > > ==== > > > > From what I can see, on all my OSD nodes in my Ceph cluster, the journal > is mounted on > > this folder (or file?) instead of /journal: > > > > /var/lib/ceph/osd/ceph-X/journal > > > > which in turns is a symbolic link to this file: > > > > lrwxrwxrwx 1 root root 58 Apr 6 23:45 journal -> > > /dev/disk/by-partuuid/3ff2c20c-6b58-41d3-9e7e-b3ec63c62c2f > > > > which in turns is a symbolic link to the journal partition on the device: > > > > lrwxrwxrwx 1 root root 10 May 3 23:48 > 3ff2c20c-6b58-41d3-9e7e-b3ec63c62c2f -> ../../sdf1 > > > > I am using one SSD for journals for multiple OSDs within a node. Any > advise on the > > correct way how to mount and create the journal? Do I need to mount > first, or create > > first? Because I supposed that we need to mount to the partition *after* > the journal is > > created? > > > > I am using latest stable version of Dumpling (v0.67.7). > > > > Any advice is greatly appreciated. > > > > Thank you. > > > > > > > > On Wed, May 7, 2014 at 1:40 AM, Craig Lewis <clewis at centraldesktop.com> > wrote: > > On 5/6/14 03:34 , Gandalf Corvotempesta wrote: > > > > Hi to all, > > I would like to replace a disk used as journal (one partition for each > OSD) > > > > Which is the safest method to do so? > > _______________________________________________ > > ceph-users mailing list > > ceph-users at lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > I haven't tried this yet, but I imagine that the process is similar to > moving your > > journal from the spinning disk to an SSD. > > > > S?bastien Han had a blog post about this: > > > http://www.sebastien-han.fr/blog/2012/08/17/ceph-storage-node-maintenance/ > > > > > > > > -- > > > > Craig Lewis > > Senior Systems Engineer > > Office +1.714.602.1309 > > Email clewis at centraldesktop.com > > > > Central Desktop. Work together in ways you never thought possible. > > Connect with us Website | Twitter | Facebook | LinkedIn | Blog > > > > > > _______________________________________________ > > ceph-users mailing list > > ceph-users at lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > > > > > > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20140509/2a224cdf/attachment.htm>
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