Hi Owen, > On 29 Sep 2014, at 10:33, Owen Synge <osynge at suse.com> wrote: > > Hi Dan, > > At least looking at upstream to get journals and partitions persistently > working, this requires gpt partitions, and being able to add a GPT > partition UUID to work perfectly with minimal modification. > > I am not sure the status of this on RHEL6, The latest Fedora and > OpenSUSE support this but SLE12 (To be released) and I think RHEL7 do > support this. > > Im sure you can bypass this as every data partition contains a symlink > to the journal partition, but persistent naming may be more work if you > dont use GPT partitions. The persistent names and udev triggers all work when I first setup the drives with ceph-disk. The ptables are indeed GPT and the links to the journals are to the persistent by-partuuid links. My setup is like this, and it works perfectly: ceph-disk prepare /dev/sde /dev/sda ceph-disk prepare /dev/sdf /dev/sda ceph-disk prepare /dev/sdg /dev/sda ceph-disk prepare /dev/sdh /dev/sda ceph-disk prepare /dev/sdi /dev/sda (each time ceph-disk creates the next partition on sda and creates the correct persistent links. The udev trigger calls ceph-disk activate and the OSD is eventually started). My only question is about the replacement procedure (e.g. for sde). The options I?ve seen are - ceph-disk prepare /dev/sde /dev/sda ? this will create a 6th partition on sda - ceph-disk prepare /dev/sde /dev/sda1 ? in this case the journal link is to sda1 instead of the persistent link. - parted /dev/sda rm 1; ceph-disk prepare /dev/sde /dev/sda ? I thought this was working, but in fact the ptable looks like this afterwards (part #1 is at the end of the disk): Number Start End Size File system Name Flags 2 21.5GB 43.0GB 21.5GB ceph journal 3 43.0GB 64.4GB 21.5GB ceph journal 4 64.4GB 85.9GB 21.5GB ceph journal 5 85.9GB 107GB 21.5GB ceph journal 1 107GB 129GB 21.5GB ceph journal I?m going to trace what is happening with ceph-disk prepare /dev/sde /dev/sda1 and try to coerce that to use the persistent name. Cheers, Dan > > Best of luck. > > Owen > > > > > > On 09/29/2014 10:24 AM, Dan Van Der Ster wrote: >> Hi, >> >>> On 29 Sep 2014, at 10:01, Daniel Swarbrick <daniel.swarbrick at profitbricks.com> wrote: >>> >>> On 26/09/14 17:16, Dan Van Der Ster wrote: >>>> Hi, >>>> Apologies for this trivial question, but what is the correct procedure to replace a failed OSD that uses a shared journal device? >>>> >>>> I?m just curious, for such a routine operation, what are most admins doing in this case? >>>> >>> >>> I think ceph-osd is what you need. >>> >>> ceph-osd -i <osd id> ?mkjournal >> >> >> At the moment I am indeed using this command to in our puppet manifests for creating and replacing OSDs. But now I?m trying to use the ceph-disk udev magic, since it seems to be the best (perhaps only?) way to get persistently named OSD and journal devs (on RHEL6). >> >> Cheers, Dan >> _______________________________________________ >> 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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