Hi Luis,
some chances that you're hit by https://tracker.ceph.com/issues/52089.
What is your physical DB volume configuration - are there fast
standalone disks for that? If so are they showing high utilization
during the benchmark?
It makes sense to try 16.2.6 once available - would the problem go away?
Thanks,
Igor
On 9/5/2021 8:45 PM, Luis Domingues wrote:
Hello,
I run a test cluster of 3 machines with 24 HDDs each, running bare-metal on
CentOS 8. Long story short, I can have a bandwidth of ~ 1'200 MB/s when I do a
rados bench, writing objects of 128k, when the cluster is installed with
Nautilus.
When I upgrade the cluster to Pacific, (using ceph-ansible to deploy and/or
upgrade), my performances drop to ~400 MB/s of bandwidth doing the same rados
bench.
I am kind of clueless on what makes the performance drop so much. Does someone
have some ideas where I can dig to find the root of this difference?
Thanks,
Luis Domingues
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