From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of Matteo
Sent: 19 September 2016 15:24
Subject: [ceph-users] capacity planning - iops
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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