I played with this feature a while ago and recall it had visible
negative impact on user operations due to the need to submit tons of
discard operations - effectively each data overwrite operation triggers
one or more discard operation submission to disk.
And I doubt this has been widely used if any.
Nevertheless recently we've got a PR to rework some aspects of thread
management for this stuff, see https://github.com/ceph/ceph/pull/55469
The author claimed they needed this feature for their cluster so you
might want to ask him about their user experience.
W.r.t documentation - actually there are just two options
- bdev_enable_discard - enables issuing discard to disk
- bdev_async_discard - instructs whether discard requests are issued
synchronously (along with disk extents release) or asynchronously (using
a background thread).
Thanks,
Igor
On 01/03/2024 13:06, jsterr@xxxxxxxxxxxx wrote:
Is there any update on this? Did someone test the option and has
performance values before and after?
Is there any good documentation regarding this option?
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