Hello,
We have deployed ceph cluster and we are trying to debug a massive drop in performance between the RADOS layer vs the RGW layer
## Cluster config
4 OSD nodes (12 Drives each, NVME Journals, 1 SSD drive) 40GbE NIC
2 RGW nodes ( DNS RR load balancing) 40GbE NIC
3 MON nodes 1 GbE NIC
## Pool configuration
RGW data pool - replicated 3x 4M stripe (HDD)
RGW metadata pool - replicated 3x (SSD) pool
## Benchmarks
4K Read IOP/s performance using RADOS Bench 48,000~ IOP/s
4K Read RGW performance via s3 interface ~ 130 IOP/s
Really trying to understand how to debug this issue. all the nodes never break 15% CPU utilization and there is plenty of RAM. The one pathological issue in our cluster is that the MON nodes are currently on VMs that are sitting behind a single 1 GbE NIC. (We are in the process of moving them, but are unsure if that will fix the issue.
What metrics should we be looking at to debug the RGW layer. Where do we need to look?
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