docs/doc/source/storage/kubernetes/replace-osds-on-an-aio-sx-single-disk-system-without-backup-951eefebd1f2.rst

Replace OSDs on an AIO-SX Single Disk System without Backup

1. Get a list of all pools and their settings (size, min_size, pg_num, pgp_num).

   ~(keystone_admin)$ ceph osd lspools # list all pools
   ~(keystone_admin)$ ceph osd pool get $POOLNAME $SETTING

   Keep the pool names and settings as they will be used in step 12.

2. Lock the controller.

   ~(keystone_admin)$ system host-lock controller-0

3. Remove all applications that use ceph pools.

   ~(keystone_admin)$ system application-list # list the applications
   ~(keystone_admin)$ system application-remove $APPLICATION_NAME # remove
   application

   Keep the names of the removed applications as they will be used in step 11.

4. Make a backup of /etc/pmon.d/ceph.conf to a safe location and remove the ceph.conf file from the /etc/pmon.d folder.

5. Stop ceph-mds.

   ~(keystone_admin)$ /etc/init.d/ceph stop mds

6. Declare ceph fs as failed and delete it.

   ~(keystone_admin)$ ceph mds fail 0
   ~(keystone_admin)$ ceph fs rm <ceph fs filename> --yes-i-really-mean-it

7. Allow Ceph pools to be deleted.

   ~(keystone_admin)$ ceph tell mon.\* injectargs
   '--mon-allow-pool-delete=true'

8. Remove all the pools.

   ~(keystone_admin)$ ceph osd pool ls | xargs -i ceph osd pool delete {}
   {} --yes-i-really-really-mean-it

9. Shutdown machine, replace disk, turn it on and wait for boot to finish.

10. Move the backed up ceph.conf from step 4 to /etc/pmon.d and unlock the controller.

11. Add the applications that were removed in step 3.

12. Verify that all pools and settings listed in step 1 are recreated.

Warning

This procedure does not include a backup, so it might cause the loss of data.