Latency : target=0, window=0, percentile=100.00%, depth=1 Random-write: Laying out IO file (1 file / 4096MiB) Host hardware $ fio -name=random-write -ioengine=posixaio -rw=randwrite -bs=4k -size=4g -numjobs=1 -iodepth=1 -runtime=60 -time_based -end_fsync=1 Single 4KiB random write process: worst possible test to perform
Here are some further tests I have performed: I also checked cache mode none/writeback no difference to speed I tried setting nocache on the disk via virt-manager I created disk type raw and qcow2 only difference I saw was the creation of the file disk when specifying. On my vm I create using kvm it drops to around 20MB's
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