On Thu, 17 Oct 2013, Snider, Tim wrote: > /var/lib/ceph/osd/ceph-NNN/journal is a "real" file on my system: > ls -l /var/lib/ceph/osd/ceph-0/journal > -rw-r--r-- 1 root root 1073741824 Oct 17 06:47 /var/lib/ceph/osd/ceph-0/journal > > Any problems with my proposed added steps (3 - 5)? > > 1. stop a ceph-osd daemon > 2. ceph-osd --flush-journal -i NNN > 3. (+) cp /var/lib/ceph/osd/ceph-NNN/journal /var/lib/ceph/osd/ceph-NNN/journal.saved > 4. (+) create a new empty journal file: > touch /mount/sdzNNN/journal > 5. (+) Create the symbolic link for Ceph: > ln -s /mount/sdzNNN/journal var/lib/ceph/osd/ceph-NNN/journal 3. mv journal journal.old 4. ln -s /dev/whatever journal (you're better off using a raw partition or other block device than a file.) or, 4. touch /new/path 5. ln -s /other/path journal > 6. ceph-osd --mkjournal -i NNN > 7. start ceph-osd > > Tim > -----Original Message----- > From: Sage Weil [mailto:sage@xxxxxxxxxxx] > Sent: Wednesday, October 16, 2013 5:02 PM > To: Snider, Tim > Cc: ceph-users@xxxxxxxxxxxxxx > Subject: Re: changing from default journals to external journals > > On Wed, 16 Oct 2013, Snider, Tim wrote: > > I configured my cluster using the default journal location for my > > osds. Can I migrate the default journals to explicit separate devices > > without a complete cluster teardown and reinstallation? How? > > - stop a ceph-osd daemon, then > - ceph-osd --flush-journal -i NNN > - set/adjust the journal symlink at /var/lib/ceph/osd/ceph-NNN/journal to > point wherever you want > - ceph-osd --mkjournal -i NNN > - start ceph-osd > > This won't set up the udev magic on the journal device, but that doesn't really matter if you're not hotplugging devices. > > sage > > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |