Hi Robert,
> Are there any people running Mysql instances from qemu rbd?
> The performance of the databases is not that great.
try to setup bcache or flashcache on top of the rdb-device.
With a Intel S37000 caching SSD-disk, we got the following fio results agains a bcache'd rbd device:
bs=4K-4K/4K-4K, ioengine=libaio, iodepth=1 Write: 4.5 MB/sec (1132 IOPS) Read: 48 MB/sec (12073 IOPS)
bs=4K-4K/4K-4K, ioengine=libaio, iodepth=2 Write: 112 MB/sec (28179 IOPS) Read: 54 MBsec ( 13662 IOPS)
bs=4K-4K/4K-4K, ioengine=libaio, iodepth=8 Weite: 181 MB/sec (45469) Read: 200 MB/sec (44931 IOPS)
bs=1M-1M/1M-1M, ioengine=libaio, iodepth=1 Weite: 125 MB Read: 143 MB
bs=1M-1M/1M-1M, ioengine=libaio, iodepth=2 Weite: 232 MB Read: 330 MB
(Ceph cluster: 3 Nodes, 10GBit front, 10GBit backend network, 8 OSDs/node, 2 journal SSD/Node)
best regards
Danny
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