A common journal disk (usually SSD) can be used for multiple OSD disks.
In case an OSD disk dies off and needs to be replaced, 'ceph-disk' is used to mention the journal disk to which the writes intended for the new OSD should go to.
Unfortunately, in Firefly, adding a new disk with 'ceph-disk' does not handle re-using a shared SSD journal properly. It fails to create a symlink to the journal disk properly.
- Red Hat Ceph Storage 1.2.3
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