> 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.
>
> 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.
>
> service ceph osd stop $OSD
> mkfs -t xfs /dev/XXX
> ceph-osd -i $OSD --mkfs --mkkey --mkjournal
> service ceph osd start $OSD
this is what I did now:
ceph osd set noout
service ceph stop osd.X
umount /dev/sdX1
mkfs.xfs -f -i size=2048 /dev/sdX1 -L osd.X
vim /etc/fstab # edit line for /dev/sdX1
mount /dev/sdX1
ceph-osd -i X --mkfs --mkkey --mkjournal
ceph auth add osd.X osd 'allow *' mon 'allow rwx' -i
/var/lib/ceph/osd/ceph-X/keyring
service ceph start osd.X
seems to work so far, the OSD is busy retrieving data - and I didn't have to
wait for the OSD to become empty.
cheers
jc
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