I am considering converting some OSDs to xfs (currently running btrfs) for stability reasons. I have a couple of ideas for doing this, and was hoping to get some comments: Method #1: 1. Check cluster health and make sure data on a specific OSD is replicated elsewhere. 2. Bring down the OSD 3. Reformat it to xfs 4. Restart OSD 5. Repeat 1-4 until all btrfs OSDs have been converted. Method #2: 1. Take cluster offline. 2. Copy the data off btrfs onto a separate disk 3. Reformat it to xfs 4. Copy data back 5. Repeat 1-4 until all btrfs disks have been converted. 6. Bring up cluster. Obviously #1 seems much more appetizing, but unfortunately I can't seem to find out how to verify that data on a specific OSD is replicated elsewhere. I could go off general cluster health, but that seems more error prone. Going with #2 would incur a large downtime, which I would like to avoid. Additionally, I am not completely certain which data must be copied off and restored, as it seems some btrfs snapshots are done which would not easily be migratable to xfs. Which of these sounds better to other people? Is there a method #3? -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
