Hi Folks,
I thought I would mention that I've released a couple of performance
articles on the Ceph blog recently that might be of interest to people:
1.
https://ceph.io/en/news/blog/2022/rocksdb-tuning-deep-dive/
<https://ceph.io/en/news/blog/2022/rocksdb-tuning-deep-dive/>
2.
https://ceph.io/en/news/blog/2022/qemu-kvm-tuning/
<https://ceph.io/en/news/blog/2022/qemu-kvm-tuning/>
3.
https://ceph.io/en/news/blog/2022/ceph-osd-cpu-scaling/
<https://ceph.io/en/news/blog/2022/ceph-osd-cpu-scaling/>
The first covers RocksDB tuning. How we arrived at our defaults, an
analysis of some common settings that have been floating around on the
mailing list, and potential new settings that we are considering making
default in the future.
The second covers how to tune QEMU/KVM with librbd to achieve high
single-client performance on a small (30 OSD) NVMe backed cluster. This
article also covers the performance impact when enabling 128bit AES
over-the-wire encryption.
The third covers per-OSD CPU/Core scaling and the kind of IOPS/core and
IOPS/NVMe numbers that are achievable both on a single OSD and on a
larger (60 OSD) NVMe cluster. In this case there are enough clients and
a high enough per-client iodepth to saturate the OSD(s).
I hope these are helpful or at least interesting!
Thanks,
Mark
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