From: ceph-users [] On Behalf Of Matteo 
Sent: 19 September 2016 15:24
Subject: [ceph-users] capacity planning - iops


Hi All,


I’m trying to estimate how many iops ( 4k direct random write )  my ceph 
cluster should deliver.

I’ve Journal on SSDs and SATA 7.2k drives for OSD.



The question is: does journal on SSD increase the number of maximum write iops 
or I need to consider only the IOPS provided by SATA drives divided by replica 


Yes, pretty much this is correct. A journal may help increase the total 
throughput if the workload isn’t completely random, but I guess you always need 
to design for the worst case scenario. What a SSD journal will do is lower the 
latency per IO.









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