root@zeus:/mnt# mdcmd set md_write_method 1
root@zeus:/mnt# dd if=/dev/zero bs=10M of=/mnt/disk1/test.tmp count=256 conv=fdatasync
256+0 records in
256+0 records out
2684354560 bytes (2.7 GB, 2.5 GiB) copied, 32.6126 s, 82.3 MB/s
root@zeus:/mnt# mdcmd set md_write_method 0
root@zeus:/mnt# dd if=/dev/zero bs=10M of=/mnt/disk1/test.tmp count=256 conv=fdatasync
256+0 records in
256+0 records out
2684354560 bytes (2.7 GB, 2.5 GiB) copied, 75.4216 s, 35.6 MB/s
root@zeus:/mnt# mdcmd set md_write_method 1
root@zeus:/mnt# dd if=/dev/zero bs=10M of=/mnt/disk1/test.tmp count=256 conv=fdatasync
256+0 records in
256+0 records out
2684354560 bytes (2.7 GB, 2.5 GiB) copied, 31.8974 s, 84.2 MB/s
root@zeus:/mnt# mdcmd set md_write_method 0
root@zeus:/mnt# dd if=/dev/zero bs=10M of=/mnt/disk1/test.tmp count=256 conv=fdatasync
256+0 records in
256+0 records out
2684354560 bytes (2.7 GB, 2.5 GiB) copied, 75.3527 s, 35.6 MB/s