Re: Backup of cephfs metadata

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We've discussed the order of work (you can see my recent Ceph blog
post on the subject; though it's subject to revision) but haven't
committed to any dates at this time. Sorry. :(
-Greg
Software Engineer #42 @ http://inktank.com | http://ceph.com


On Wed, Apr 10, 2013 at 12:43 PM, Maik Kulbe
<info@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> So in fact, there is no other solution than normal file-based backups and
> hoping the MDS won't crash?
>
> Are there any plans which release will contain a stable CephFS/MDS?
>
>> Well, if you've made changes to your data which impacted the metadata,
>> and then you restore to a backup of the metadata pool, but not the
>> data, then what's there isn't what CephFS thinks is there. Which would
>> be confusing for all the same reasons that it is in a local
>> filesystem. You could construct a use case and a backup system which
>> would produce a working system, but I don't think it'd be very useful
>> for most applications.
>> -Greg
>> Software Engineer #42 @ http://inktank.com | http://ceph.com
>>
>>
>> On Wed, Apr 10, 2013 at 12:13 PM, Maik Kulbe
>>  wrote:
>> > I think going backwards in time would be, what a backup is for, isn't
>> it? ;)
>> >
>> > My question really just is, if it is possible, to back it up. It just
>> really
>> > stinks to completely rebuild the cluster and re-import all the data
>> > everytime I make some small mistake in the environment and the
>> metadata
>> > backup would really help to save some time here.
>> >
>> >> If you were to do that you'd be going backwards in time with your
>> >> metadata, so — not really. CephFS is not generally
>> production-ready
>> >> at
>> >> this time, but we welcome bug reports!
>> >> -Greg
>> >> Software Engineer #42 @ http://inktank.com | http://ceph.com
>> >>
>> >>
>> >> On Mon, Apr 8, 2013 at 12:52 PM, Maik Kulbe
>> >>  wrote:
>> >> > Hi,
>> >> >
>> >> > I'm currently testing Ceph with the POSIX fs at work as a fs
>> cluster.
>> >> So far
>> >> > I've managed to cripple the test environment three or four times
>> be
>> >> > unintendently crashing the MDS(1 active, 2 hot-standby). It seems
>> to
>> >> me the
>> >> > MDS are pretty sensitive to all kinds of environmental changes and
>> so
>> >> to use
>> >> > this I really need a backup solution for the Metadata.
>> >> >
>> >> > I've seen that RADOS supports an export command and that this also
>> >> works
>> >> > with the MD pool. Now the question is - can I just export and in
>> case
>> >> I need
>> >> > it re-import the exported metadata or are there problems with that?
>> If
>> >> so,
>> >> > what would be a better way to handle this?
>> >> >
>> >> > Thanks in advance,
>> >> >
>> >> > Maik Kulbe
>> >> > _______________________________________________
>> >> > ceph-users mailing list
>> >> > ceph-users@xxxxxxxxxxxxxx
>> >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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