On 26/08/2020 15:59, Stefan Kooman wrote:
On 2020-08-26 15:20, Marcel Kuiper wrote:
Hi Vladimir,
no it is the same on all monitors. Actually I got triggered because I got
slow responses on my rados gateway with the radosgw-admin command and
narrowed it down to slow respons for rados commands anywhere in the
cluster.
Do you have a very large amount of objects. And / or a lot of OMAP data
and thus large rocksdb databases? We have seen slowness (and slow ops)
from having very large rocksdb databases due to a lot of OMAP data
concentrated on only a few nodes (cephfs metadata only). You might
suffer from the same thing.
Manual rocksdb compaction on the OSDs might help.
In addition: Keep in mind that RADOS was never designed to list objects
fast. The more Placement Groups you have the slower a listing will be.
Wido
Gr. Stefan
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