what I meant is, when the total IOPS reach to 3000+, the total cluster
gets very slow. so any idea? thanks.
On 2017/4/6 9:51, PYH wrote:
Hi,
we have 21 hosts, each has 12 disks (4T sata), no SSD as journal or
cache tier.
so the total OSD number is 21x12=252.
there are three separate hosts for monitor nodes.
network is 10Gbps. replicas are 3.
under this setup, we can get only 3000+ IOPS for random writes for whole
cluster.test method such as,
$ fio -name iops -rw=randwrite -bs=4k -runtime=60 -iodepth 64 -numjobs=2
-filename /dev/rbd0 -ioengine libaio -direct=1
it's much lower than my expect. Do you have any suggestions?
thanks.
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