Re: Rebuilding/recreating CephFS journal?

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On Fri, May 27, 2016 at 9:44 AM, Stillwell, Bryan J
<Bryan.Stillwell@xxxxxxxxxxx> wrote:
> I have a Ceph cluster at home that I¹ve been running CephFS on for the
> last few years.  Recently my MDS server became damaged and while
> attempting to fix it I believe I¹ve destroyed by CephFS journal based off
> this:
>
> 2016-05-25 16:48:23.882095 7f8d2fac2700 -1 log_channel(cluster) log [ERR]
> : Error recovering journal 200: (2) No such file or directory
>
> As far as I can tell the data and metadata are still in tact, so I¹m
> wondering if there¹s a way to rebuild the cephfs journal or if that¹s not
> possible, a way to start extracting the data?

Check out http://docs.ceph.com/docs/master/cephfs/disaster-recovery/

You'll want to make sure you've actually lost the whole journal (how
did you manage that?!?!), reset it, and quite possibly run the data
scan tools. Be careful!
-Greg
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