On 20/11/13 22:27, Robert van Leeuwen wrote:
Hi,
What is the easiest way to replace a failed disk / OSD.
It looks like the documentation here is not really compatible with ceph_deploy:
http://ceph.com/docs/master/rados/operations/add-or-rm-osds/
It is talking about adding stuff to the ceph.conf while ceph_deploy works in a different way.
(I've tried it without adding to ceph.conf and that obviously did not work)
Is there a easy way to replace a single failed OSD which has been deployed with ceph_deploy?
You could remove the OSD and add a new one but I would prefer to just reuse the current config / OSD numbers.
Basically I would like to do a partition/format and some ceph commands to get stuff working again...
I looked at this a while back (experimenting with how to add a failed
osd back in after rebuilding it). Unfortunately I can't find my notes
right now - but I recall the key features being (following the docs for
removing an osd):
- checking it is stopped/failed
- remove it from the crushmap (ceph osd crush remove)
- delete its auth key (ceph auth del)
- remove the osd (ceph osd rm)
Then recreate it using cep-deploy (osd create of similar), would
(usually? reuse the (now) vacant osd num slot.
Nothing needed for editing ceph.conf I recall.
I'll take a better look at this tomorrow (unless someone who knows this
better - which is probably a big list - corrects my musings)!
Cheers
Mark
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