---Диск с cache=writeback bus=virtio---

Послед. запись
    fio -filename=/dev/vda -direct=1 -sync=1 -rw=write -bssplit=512/10:1k/5:2k/5:4k/60:8k/2:16k/4:32k/4:64k/10  -numjobs=1 -iodepth=1 --ioengine=libaio -runtime=60 -size=1m -time_based -group_reporting -name=journal-test
    write: io=6382.6MB, bw=108934KB/s, iops=11489, runt= 59997msec
    WRITE: io=6382.6MB, aggrb=108933KB/s, minb=108933KB/s, maxb=108933KB/s, mint=59997msec, maxt=59997msec
    vda: ios=388721/688336, merge=0/0, ticks=25019/48910, in_queue=73874, util=85.61%

Случайная запись
    fio -filename=/dev/vda -direct=1 -sync=1 -rw=randwrite -bssplit=512/10:1k/5:2k/5:4k/60:8k/2:16k/4:32k/4:64k/10  -numjobs=1 -iodepth=1 --ioengine=libaio -runtime=60 -size=1m -time_based -group_reporting -name=journal-test
    write: io=4160.5MB, bw=71000KB/s, iops=14144, runt= 59998msec
    WRITE: io=4160.5MB, aggrb=70999KB/s, minb=70999KB/s, maxb=70999KB/s, mint=59998msec, maxt=59998msec
    vda: ios=265420/847638, merge=0/0, ticks=15562/50237, in_queue=65690, util=86.53%

Послед. чтение
    fio -filename=/dev/vda -direct=1 -sync=1 -rw=read -bssplit=512/10:1k/5:2k/5:4k/60:8k/2:16k/4:32k/4:64k/10  -numjobs=1 -iodepth=1 --ioengine=libaio -runtime=60 -size=1m -time_based -group_reporting -name=journal-test
    read : io=9226.4MB, bw=157474KB/s, iops=16608, runt= 59996msec
    READ: io=9226.4MB, aggrb=157473KB/s, minb=157473KB/s, maxb=157473KB/s, mint=59996msec, maxt=59996msec
    vda: ios=995310/0, merge=0/0, ticks=53426/0, in_queue=53308, util=88.85%

Случайное чтение
    fio -filename=/dev/vda -direct=1 -sync=1 -rw=randread -bssplit=512/10:1k/5:2k/5:4k/60:8k/2:16k/4:32k/4:64k/10  -numjobs=1 -iodepth=1 --ioengine=libaio -runtime=60 -size=1m -time_based -group_reporting -name=journal-test
    read : io=5455.9MB, bw=93116KB/s, iops=18550, runt= 59998msec
    READ: io=5455.9MB, aggrb=93115KB/s, minb=93115KB/s, maxb=93115KB/s, mint=59998msec, maxt=59998msec
    vda: ios=1112199/0, merge=0/0, ticks=53417/0, in_queue=53275, util=88.79%