On Sat, Jun 29, 2019 at 6:51 PM Bryan Henderson <bryanh@xxxxxxxxxxxxxxxx> wrote:
> The reason it is so long is that you don't want to move data
> around unnecessarily if the osd is just being rebooted/restarted.
I think you're confusing down with out. When an OSD is out, Ceph
backfills. While it is merely down, Ceph hopes that it will come back.
But it will direct I/O to other redundant OSDs instead of a down one.
Going down leads to going out, and I believe that is the 600 seconds you
mention - the time between when the OSD is marked down and when Ceph marks it
out (if all other conditions permit).
There is a pretty good explanation of how OSDs get marked down, which is
pretty complicated, at
http://docs.ceph.com/docs/master/rados/configuration/mon-osd-interaction/
It just doesn't seem to match the implementation.
--
Bryan Henderson San Jose, California
" I'm not sure why the monitor did not mark it _out_ after 600 seconds (default) "
The "down timeout" I mention is the "mon osd down out interval".
The rest of what I wrote is correct. Just to make sure I don't confuse anyone else.
----------------
Robert LeBlanc
Robert LeBlanc
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