When commissioning a cluster, it is always advisable to log and evaluate the ceph osd bench results.
The values can also be helpful for performance analysis in a productive Ceph cluster.
ceph tell osd.<int|*> bench {<int>} {<int>} {<int>}
OSD benchmark: write <count> <size> -byte objects, (default 1G size 4MB)
osd_bench_max_block_size=65536 kB
Example:
1G size 4MB (default)
ceph tell osd.* bench
1G size 64MB
ceph tell osd.* bench 1073741824 67108864