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.
Alessandro
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