> > Hello, > > On Fri, 22 Apr 2016 06:20:17 +0200 Martin Wilderoth wrote: > > > I have a ceph cluster and I will change my journal devices to new SSD's. > > > > In some instructions of doing this they refer to a journal file (link to > > UUID of journal ) > > > > In my OSD folder this journal don’t exist. > > > If your cluster is "years old" and not created with ceph-disk, then yes, > that's not surprising. > Mind, I created a recent one of mine manually and still used that scheme: > --- ls -la /var/lib/ceph/osd/ceph-12/ > total 80 > drwxr-xr-x 4 root root 4096 Mar 1 14:44 . > drwxr-xr-x 8 root root 4096 Sep 10 2015 .. > -rw-r--r-- 1 root root 37 Sep 10 2015 ceph_fsid > drwxr-xr-x 320 root root 24576 Mar 2 20:24 current > -rw-r--r-- 1 root root 37 Sep 10 2015 fsid > lrwxrwxrwx 1 root root 44 Sep 10 2015 journal -> > /dev/disk/by-id/wwn-0x55cd2e404b77573c-part5 > -rw------- 1 root root 57 Sep 10 2015 keyring > --- > > Ceph isn't magical, so if that link isn't there, you probably have > something like this in your ceph.conf, preferably with UUID instead of thet > possibly changing device name: > --- > [osd.0] > host = ceph-01 > osd journal = /dev/sdc3 > ---
Yes that is my setup, Would that mean i could either create symlink journal -> /dev/disk/...... remove the osd journal in ceph.conf. or change my ceph.conf with osd journal = /dev/.... And the recommended way is actually to use journal symlink ? > > > This instructions is renaming the UUID of new device to the old UUID not > > to break anything. > > > > i was planning to use the command ceph-osd --mkjournal and update the > > ceph. conf accordingly. > > > > Do I need to take care of my missing journal symlink, i think it is a > > symlink ? > > Why is it there, and how is it used ?. > > > > I actually don’t remember the command i used to create the disk but it's > > some years ago and i doubt i used ceph-disk. > > > > I found the following process in this list, that seemed good. But its > > still not clear to me if i can skip this journal link ? > > > > *set noout* > > *stop the osds* > > *flush the journal* > > *replace journal SSDs* > > recreate journal partitions > > update ceph.conf to reflect new journal device names > Either that or remove the location and create the symlink. > In both cases UUID is the fail-safe way to go. > > *recreate the journal (for the existing osds)* > > *start the osds* > > *unset noout* I dont really need to keep the old uuid as long as im using the correct uuid in my config (symlink) ? To check what journal an osd is using what is the command ?
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