Hi everyone, i'm running a Luminous 12.2.5 cluster with 6 hosts on
ubuntu 16.04 - 12 HDDs for data each, plus 2 SSD metadata OSDs(three
nodes have an additional SSD i added to have more space to rebalance the
metadata). CUrrently, the cluster is used mainly as a radosgw storage,
with 28tb data in total, replication 2x for both the metadata and data
pools(a cephfs isntance is running alongside there, but i don't think
it's the perpetrator - this happenned likely before we had it). All
pools aside from the data pool of the cephfs and data pool of the
radosgw are located on the SSD's. Now, the interesting thing - at random
times, the metadata OSD's fill up their entire capacity with OMAP data
and go to r/o mode and we have no other option currently than deleting
them and re-creating. The fillup comes at a random time, it doesn't seem
to be triggered by anything and it isn't caused by some data influx. It
seems like some kind of a bug to me to be honest, but i'm not certain -
anyone else seen this behavior with their radosgw? Thanks a lot
Josef Zelenka
Cloudevelops
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