Hi all,
We are discussing different approaches how to replace a disk with DB
(typically SSD or NVMe disk) for BlueStore. When the disk with DB died
it will cause inaccessibility of all depended OSDs (six or eight in our
environment), so we are looking for a way to minimize data loss or time
for DB reconstruction.
1. The easiest way is just replace DB disk with a new one, but in this
case, the reconstruction will take a long time.
2. When DB disk is not completely dead and has only relocated sectors
without bad sectors ... we can add new disk to the server and make a
copy from old to the new one (using dd or similar tools). After that we
only switch symbolic links in associated OSDs (in
/var/lib/ceph/osd/osd-*/block.db). But this does not work with a
completely dead disk.
3. It would be nice to have some command/script which can prepare data
on new/replaced DB disk (scan over all disks) and accelerate DB disk
replacement.
How do you do it in your environment?
Thank you
Regards
Michal
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