The fact that you are all SSD I would do exactly what Wido said - gracefully remove the OSD and gracefully bring up the OSD on the new SSD. Let Ceph do what its designed to do. The rsync idea looks great on paper - not sure what issues you will run into in practise. On Fri, Dec 16, 2016 at 12:38 PM, Alessandro Brega <alessandro.brega1@xxxxxxxxx> wrote: > 2016-12-16 10:19 GMT+01:00 Wido den Hollander <wido@xxxxxxxx>: >> >> >> > Op 16 december 2016 om 9:49 schreef Alessandro Brega >> > <alessandro.brega1@xxxxxxxxx>: >> > >> > >> > 2016-12-16 9:33 GMT+01:00 Wido den Hollander <wido@xxxxxxxx>: >> > >> > > >> > > > Op 16 december 2016 om 9:26 schreef Alessandro Brega < >> > > alessandro.brega1@xxxxxxxxx>: >> > > > >> > > > >> > > > Hi guys, >> > > > >> > > > I'm running a ceph cluster using 0.94.9-1trusty release on XFS for >> > > > RBD >> > > > only. I'd like to replace some SSDs because they are close to their >> > > > TBW. >> > > > >> > > > I know I can simply shutdown the OSD, replace the SSD, restart the >> > > > OSD >> > > and >> > > > ceph will take care of the rest. However I don't want to do it this >> > > > way, >> > > > because it leaves my cluster for the time of the rebalance/ >> > > > backfilling >> > > in >> > > > a degraded state. >> > > > >> > > > I'm thinking about this process: >> > > > 1. keep old OSD running >> > > > 2. copy all data from current OSD folder to new OSD folder (using >> > > > rsync) >> > > > 3. shutdown old OSD >> > > > 4. redo step 3 to update to the latest changes >> > > > 5. restart OSD with new folder >> > > > >> > > > Are there any issues with this approach? Do I need any special rsync >> > > flags >> > > > (rsync -avPHAX --delete-during)? >> > > > >> > > >> > > Indeed X for transferring xattrs, but also make sure that the >> > > partitions >> > > are GPT with the proper GUIDs. >> > > >> > > I would never go for this approach in a running setup. Since it's a >> > > SSD >> > > cluster I wouldn't worry about the rebalance and just have Ceph do the >> > > work >> > > for you. >> > > >> > > >> > Why not - if it's completely safe. It's much faster (local copy), >> > doesn't >> > put load on the network (local copy), much safer (2-3 minutes instead of >> > 1-2 hours degraded time (2TB SSD)), and it's really simple (2 rsync >> > commands). Thank you. >> > >> >> I wouldn't say it is completely safe, hence my remark. If you copy, indeed >> make sure you copy all the xattrs, but also make sure the partitions tables >> match. >> >> That way it should work, but it's not a 100% guarantee. >> > > Ok, thanks! Can a ceph dev confirm? I do not want to loose any data ;) > > Alessandro > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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