Re: Estimate Max IOPS of Cluster

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if you are asking about what tools to use:
 
You should run many concurrent processes on different clients
 

Sent: Wednesday, January 04, 2017 6:45 PM
Subject: Re: Estimate Max IOPS of Cluster


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

Sent: Tuesday, January 03, 2017 10:15 PM
Subject: Estimate Max IOPS of Cluster

Hello,

Does any one have a reasonably accurate way to determine the max IOPS of a Ceph cluster?

Thank You,

___

John Petrini


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