[PVE-User] Spillover issue

Eneko Lacunza elacunza at binovo.es
Tue Mar 24 13:12:03 CET 2020


Hi Allwin,

El 24/3/20 a las 12:24, Alwin Antreich escribió:
> On Tue, Mar 24, 2020 at 10:34:15AM +0100, Eneko Lacunza wrote:
>> We're seeing a spillover issue with Ceph, using 14.2.8:
[...]
>> 3. ceph health detail
>>     HEALTH_WARN BlueFS spillover detected on 3 OSD
>>     BLUEFS_SPILLOVER BlueFS spillover detected on 3 OSD
>>     osd.3 spilled over 5 MiB metadata from 'db' device (556 MiB used of
>>     6.0 GiB) to slow device
>>     osd.4 spilled over 5 MiB metadata from 'db' device (552 MiB used of
>>     6.0 GiB) to slow device
>>     osd.5 spilled over 5 MiB metadata from 'db' device (551 MiB used of
>>     6.0 GiB) to slow device
>>
>> I may be overlooking something, any idea? Just found also the following ceph
>> issue:
>>
>> https://tracker.ceph.com/issues/38745
>>
>> 5MiB of metadata in slow isn't a big problem, but cluster is permanently in
>> health Warning state... :)
> The DB/WAL device is to small and all the new metadata has to be written
> to the slow device. This will destroy performance.
>
> I think the size changes, as the DB gets compacted.
Yes. But it isn't too small... it's 6 GiB and there's only ~560MiB of data.
>
> The easiest way ist to destroy and re-create the OSD with a bigger
> DB/WAL. The guideline from Facebook for RocksDB is 3/30/300 GB.

It's well below the 3GiB limit in the guideline ;)

Thanks a lot
Eneko

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