Hi,
what is the purpose and effect of these configuration options?
bdev_async_discard
bdev_async_discard_threads
bdev_enable_discard
They are not mentioned on docs.ceph.com.
They read as they would enable a regular trim job on OSDs where the
hardware supports trimming/discarding. How often would this operation run?
On a virtual test cluster where the OSDs are backed with qcow2 files and
are presented to the VM as SSDs with discard they seem to have no effect
on the size of the qcow2 file.
With a normal filesystem an fstrim operation will reduce the size of the
qcow2 file.
Regards
--
Robert Sander
Linux Consultant
Heinlein Consulting GmbH
Schwedter Str. 8/9b, 10119 Berlin
https://www.heinlein-support.de
Tel: +49 30 405051 - 0
Fax: +49 30 405051 - 19
Amtsgericht Berlin-Charlottenburg - HRB 220009 B
Geschäftsführer: Peer Heinlein - Sitz: Berlin
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