Hi Greg...
I've had to force recreate some PGs on my cephfs data pool due to some
cascading disk failures in my homelab cluster. Is there a way to easily
determine which files I need to restore from backup? My metadata pool is
completely intact.
Assuming you're on Jewel, run a recursive "scrub" on the MDS root via
the admin socket, and all the missing files should get logged in the
local MDS log.
The data file is stripped into different objects (according to the
selected layout) that are then stored in different pgs and OSDs.
So, if a few pgs are lost, it mean that some files may be totally lost
(if all of its objects were stored in the lost pgs) or that some files
may only be partially lost (if some of its objects were stored in the
losts pgs)
Does this method properly takes into account for the second mentioned case?
(I'm surprised at this point to discover we don't seem to have any
documentation about how scrubbing works. It's a regular admin socket
command and "ceph daemon mds.<name> help" should get you going where
you need.)
Indeed. Only found some references to it on John's CephFS update Feb
2016 talk: http://www.slideshare.net/JohnSpray1/cephfs-update-february-2016
Cheers
Goncalo
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