Hello
I am experimenting with how Ceph (13.2.2) deals with on-disk data
corruption, and I've run into some unexpected behavior. I am wondering
if somebody could comment on whether I understand things correctly.
In my tests I would dd /dev/urandom onto an OSD's disk and see what
would happen. I don't fill up the entire disk (that causes OSD to crash)
and choose an OSD that is pretty full.
It looks like regular scrubs don't detect any problems at all, and I
actually don't see any disk activity. So I guess only the stuff that is
in memory is getting scrubbed?
When I initiate a deep scrub of an OSD, it looks like only PGs for which
that OSD is the primary are checked. Is this correct? If so, how is
corruption of other PGs on that OSD is detected?
Thanks,
Vlad
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