Greetings, all. I'm attempting to introduce client-side RADOS write latency monitoring on a (rook) Ceph cluster. The use case is a mixture of containers, serving file and database workloads (although my question my applies more broadly.) The aim here is to measure the average write latency as observed by a client, rather than relying entirely on the metrics reported by the OSDs (i.e ceph_osd_commit_latency_ms and ceph_osd_apply_latency_ms.) So far, I’ve tested using `rados bench` to produce some basic write latency monitoring using a shell script. The parameters I’m using: • Single thread • 64KB block size • 10 seconds to benchmark Essentially, the script parses output (average latency) from the following:
rados bench --pool=xxx 10 write -t 1 -b 65536 Questions: 1. Are the parameters outlined above optimal for this kind of performance monitoring (for example, would it be better to use a block size of 4KB, or even 1KB)? 2. Is there a better approach here (for example, using a ceph-manager plugin or other more standard approach)? Thanks! Best regards, Jules _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
