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: http://www.sys-pro.co.uk/how-many-mhz-does-a-ceph-io-need/ Cheers /Maged From: John Petrini Sent: Tuesday, January 03, 2017 10:15 PM To: ceph-users Subject: [ceph-users] 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 -------------------------------------------------------------------------------- _______________________________________________ ceph-users mailing list [email protected] http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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