Hello list,
my cluster is now pretty stable i'm just wondering about the sequential
write values.
With rados bench command and 16 threads i get totally different values
than with KVM and rbd block device.
rados -p kvmpool bench 60 write -t 16:
pool size 2: Bandwidth (MB/sec): 1137.294
pool size 3: Bandwidth (MB/sec): 846.983
Inside KVM with fio:
fio --filename=$DISK --direct=1 --rw=write --bs=4M --size=200G
--numjobs=16 --runtime=60 --group_reporting --name=file1:
pool size 2:
write: io=32984MB, bw=562046KB/s, iops=137 , runt= 60094msec
pool size 3:
write: io=29124MB, bw=496024KB/s, iops=121 , runt= 60124msec
Even when i change the pool size to 3 i get with fio 520MB/s.
Any ideas? Is this expected?
Greets
Stefan
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