Re: Drop of performance after Nautilus to Pacific upgrade

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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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