Re: Best way to reformat OSD drives?

[Jens-Christian Fischer <jens-christian.fischer@xxxxxxxxx>]

Why wait for the data to migrate away? Normally you have replicas of the whole osd data, so you can simply stop the osd, reformat the disk and restart it again. It'll join the cluster and automatically get all data it's missing. Of course the risk of dataloss is a bit higher during that time, but normally that should be ok, because it's not different from an ordinary disk failure which can happen any time.

Because I lost 2 objects last time I did that trick (probably caused by additional user (i.e. me) stupidity in the first place, but I don't really fancy taking chances this time :) )

I just found a similar question from one year ago: http://www.spinics.net/lists/ceph-devel/msg05915.html I didn't read the whole thread, but probably you can find some other ideas there.

I read it, but it is the usual to a fro - no definitive solution...

service ceph osd stop $OSD
mkfs -t xfs /dev/XXX
ceph-osd -i $OSD --mkfs --mkkey --mkjournal
service ceph osd start $OSD

I'll give that a whirl - I have enough OSDs to try - as soon as the cluster has recovered from the 9 disks I formatted on saturday

cheers

jc

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