Hi Frank,
The semantic of osd_snap_trim_sleep was copied from osd_delete_sleep.
The general setting "osd_snap_trim_sleep" is used only to override the
_hdd _hybrid _ssd tuned values.
Here's the code to get the effective sleep value:
if (osd_snap_trim_sleep > 0)
return osd_snap_trim_sleep;
if (!store_is_rotational && !journal_is_rotational)
return osd_snap_trim_sleep_ssd
if (store_is_rotational && !journal_is_rotational)
return osd_snap_trim_sleep_hybrid
return osd_snap_trim_sleep_hdd
Do you think the doc needs to be updated?
Cheers, Dan
On Thu, Feb 24, 2022 at 12:27 PM Frank Schilder <frans@xxxxxx> wrote:
>
> I seem to have the opposite problem with fs snaptrim progress as others recently. I would like to speed it up. I looked at the docs and find the description of osd_snap_trim_sleep* (https://docs.ceph.com/en/latest/rados/configuration/osd-config-ref/#confval-osd_snap_trim_sleep) counter-intuitive and confusing.
>
> For osd_snap_trim_sleep it says "This option overrides backend specific variants.", which is exactly the opposite of how other options are applied, for example, the osd_memory_target family of options. The usual way is that more specific options (back-end specific) supersede less specific options (general defaults). What is correct? Is the overall default sleep=0 for all types of OSDs, or is it 5s(=osd_snap_trim_sleep_hdd) for HDDs?
>
> If the documentation is wrong, please correct.
>
> Thanks and best regards,
> =================
> Frank Schilder
> AIT Risø Campus
> Bygning 109, rum S14
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