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Max iops depends on the hardware type/configuration for disks/cpu/network. For disks, the theoretical iops limit is
read = physical disk iops x number of disks
write (with journal on same disk) = physical disk iops x number of disks /
num of replicas / 3
in practice real benchmarks will vary widely from this, I've seen numbers
from 30 to 80 % of theoretical value.
When the number of disks/cpu cores is high, the cpu bottleneck kicks in,
again it depends on hardware but you could use a performance tool such as atop
to know when this happens on your setup. There is no theoretical measure of
this, but one good analysis i find is Nick Fisk:
Cheers /Maged From: John Petrini
Sent: Tuesday, January 03, 2017 10:15 PM
To: ceph-users
Subject: Estimate Max IOPS of Cluster Hello,
Does any one have a reasonably accurate way to determine the max IOPS of a
Ceph cluster?
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