dd if=/dev/zero bs=1k count=102400 | rait -w -b8 -V1 /dev/rst0 /dev/rst1

rait : closing all device.
rait : 58.8784 sec, 104857600 bytes, 1780918 bytes/s 1739.18 KB/sec
dd if=/dev/zero bs=1k count=102400 | rait -w -b16 -V1 /dev/rst0 /dev/rst1

rait : closing all device.
rait : 39.7850 sec, 104857600 bytes, 2635604 bytes/s 2573.83 KB/sec
dd if=/dev/zero bs=1k count=102400 | rait -w -b32 -V1 /dev/rst0 /dev/rst1

rait : closing all device.
rait : 31.1796 sec, 104857600 bytes, 3363016 bytes/s 3284.19 KB/sec
dd if=/dev/zero bs=1k count=102400 | rait -w -b64 -V1 /dev/rst0 /dev/rst1

rait : closing all device.
rait : 27.5236 sec, 104857600 bytes, 3809740 bytes/s 3720.45 KB/sec
dd if=/dev/zero bs=1k count=102400 | rait -w -b128 -V1 /dev/rst0 /dev/rst1

rait : closing all device.
rait : 31.0492 sec, 104857600 bytes, 3377139 bytes/s 3297.99 KB/sec

dd if=/dev/zero bs=1k count=102400 | dd of=/dev/rst0 bs=4k
25600+0 records in
25600+0 records out
104857600 bytes transferred in 63.520484 secs (1650768 bytes/sec)
dd if=/dev/zero bs=1k count=102400 | dd of=/dev/rst0 bs=8k
12800+0 records in
12800+0 records out
104857600 bytes transferred in 54.803458 secs (1913339 bytes/sec)
dd if=/dev/zero bs=1k count=102400 | dd of=/dev/rst0 bs=16k
6400+0 records in
6400+0 records out
104857600 bytes transferred in 54.808278 secs (1913171 bytes/sec)
dd if=/dev/zero bs=1k count=102400 | dd of=/dev/rst0 bs=32k
0+6400 records in
0+6400 records out
104857600 bytes transferred in 54.804341 secs (1913308 bytes/sec)
dd if=/dev/zero bs=1k count=102400 | dd of=/dev/rst0 bs=64k
0+6400 records in
0+6400 records out
104857600 bytes transferred in 54.817135 secs (1912862 bytes/sec)