Hi,
I have a performance question for anyone running an SSD only pool. Let me detail the setup first.
12 X Dell PowerEdge R630 ( 2 X 2620v3 64Gb RAM)
8 X intel DC 3710 800GB
Dual port Solarflare 10GB/s NIC (one front and one back)
Ceph 0.94.5
Ubuntu 14.04 (3.13.0-68-generic)
The above is in one pool that is used for QEMU guests, A 4k FIO test on the SSD directly yields around 55k Iops, the same test inside a QEMU guest seems to hit a limit around 4k Iops. If I deploy multiple guests they can all reach 4K Iops simultaneously.
I don't see any evidence of a bottle neck on the OSD hosts,Is this limit inside the guest expected or I am just not looking deep enough yet?
Thanks
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