Hi, For RAID1 with 2 slave devices underneath, we see different data on the slaves. The IO is generated by using FIO with ioengine=libaio. Following script sometimes leads to have different md5sum on the slave devices. ================== modprobe -r brd modprobe brd rd_nr=2 rd_size=2097152 dd if=/dev/zero of=/dev/ram1 oflag=direct || true dd if=/dev/zero of=/dev/ram0 oflag=direct || true dd if=/dev/ram1 | md5sum dd if=/dev/ram0 | md5sum mdadm --create md127 -f -n 2 -l raid1 /dev/ram0 /dev/ram1 <<EOF yes EOF sleep 10 cat /proc/mdstat mkfs.ext4 /dev/md127 mount /dev/md127 /tmp touch /tmp/bla.txt echo -n " [global] rw=write direct=1 size=1G ioengine=libaio iodepth=128 iodepth_batch_submit=128 iodepth_batch_complete=128 numjobs=4 group_reporting [job0] filename=/tmp/bla.txt [job1] filename=/tmp/bla.txt [job2] filename=/tmp/bla.txt [job3] filename=/tmp/bla.txt " > fio.ini cat fio.ini fio fio.ini ls -lah /tmp/ umount /tmp mdadm --stop md127 dd if=/dev/ram1 obs=1M ibs=1M skip=4 | md5sum dd if=/dev/ram0 obs=1M ibs=1M skip=4 | md5sum ========================== Is this expected behavior with async IO's? Thanks, -Swapnil -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
