On 16/09/2020 07:26, Danni Setiawan wrote:
Hi all,
I'm trying to find performance penalty with OSD HDD when using WAL/DB
in faster device (SSD/NVMe) vs WAL/DB in same device (HDD) for
different workload (RBD, RGW with index bucket in SSD pool, and CephFS
with metadata in SSD pool). I want to know if giving up disk slot for
WAL/DB device is worth vs adding more OSD.
Unfortunately I cannot find the benchmark for these kind workload. Has
anyone ever done this benchmark?
For everything except CephFS, fio looks like a best tool for
benchmarking. It can benchmark ceph on all levels: rados, rbd, http/S3.
Moreover, it has excellent configuration options, detailed metrics and
it can run with multi-server workload (one fio client forcing many fio
servers to do benchmarking). The own fio performance is at about 15M
IOPS (null engine per fio-server), and it scales horizontally.
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