rbd create liuliangtest -p vms -size 20G rbd map -p vms liuliangtest mkfs.ext4 /dev/rbd0 && mount /dev/rbd0 /mnt mount -l show: /dev/rbd0 on /mnt type ext4 (rw,relatime,stripe=1024,data=ordered)
test one of ext4: use psync command: fio --bs=4k --ioengine=psync --direct=1 --rw=randwrite --runtime=60 --group_reporting --name=fio-write --size=1G --filename=/mnt/test.db -numjobs=32 --iodepth=1 result iops: 300 test two of ext4: use libaio command: fio --bs=4k --ioengine=libaio --direct=1 --rw=randwrite --runtime=60 --group_reporting --name=fio-write --size=1G --filename=/mnt/test.db -numjobs=32 --iodepth=1 result iops: 9000 than I umount /mnt and mkfs.xfs /dev/rbd0 && mount /dev/rbd0 /mnt mount -l show: /dev/rbd0 on /mnt type xfs (rw,relatime,attr2,inode64,sunit=8192,swidth=8192,noquota) test one of xfs: use psync command: fio --bs=4k --ioengine=psync --direct=1 --rw=randwrite --runtime=60 --group_reporting --name=fio-write --size=1G --filename=/mnt/test.db -numjobs=32 --iodepth=1 result iops: 9000 test one of xfs: use libaio command: fio --bs=4k --ioengine=libaio --direct=1 --rw=randwrite --runtime=60 --group_reporting --name=fio-write --size=1G --filename=/mnt/test.db -numjobs=32 --iodepth=1 result iops: 10000 As the describe above . When use libaio .The iops of ext4 is approximately equal to xfs. But when I use psync . xfs is 30 times better than ext4. Is this correct ? Who can help explain.
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