Re: Mapped rbd is very slow

[Olivier AUDRY <olivier@xxxxxxx>]

fio -ioengine=rbd -name=test -bs=4M -iodepth=32 -rw=randwrite -runtime=60  -pool=kube -rbdname=bench

WRITE: bw=89.6MiB/s (93.9MB/s), 89.6MiB/s-89.6MiB/s (93.9MB/s-93.9MB/s), io=5548MiB (5817MB), run=61935-61935msec

fio -ioengine=rbd -name=test -bs=4M -iodepth=32 -rw=randread -runtime=60  -pool=kube -rbdname=bench

READ: bw=139MiB/s (146MB/s), 139MiB/s-139MiB/s (146MB/s-146MB/s), io=8404MiB (8812MB), run=60443-60443msec

this is great. I don't get why I can't get the same in the mapped rbd.

Le vendredi 16 août 2019 à 21:04 +0300, vitalif@xxxxxxxxxx a écrit :

- libaio randwrite

- libaio randread

- libaio randwrite on mapped rbd

- libaio randread on mapped rbd

- rbd read

- rbd write

recheck RBD with RAND READ / RAND WRITE

you're again comparing RANDOM and NON-RANDOM I/O

your SSDs aren't that bad, 3000 single-thread iops isn't the worst 

possible performance

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