Replace journals disk

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On Fri, 9 May 2014, Indra Pramana wrote:

> 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?

Right.

Your procedure looks about right, assumin gyou are using ceph.conf to 
indicate what the data and journal paths are:

> 
> - set noout
> - stop the osds
> - flush the journal
> - replace journal SSDs
- recreate journal partitions
- update ceph.conf to reflect new journal device names
> - recreate the journal (for the existing osds) 
> - start the osds
> - unset noout

sage



> 
> 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.
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> >
> >
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> >
> >
> >
> >
> >
> 
> 
> 
> 


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