Backing device (ext2 on lvm volume on md raid0)

Version  1.96       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
xenserver-gama 300M   905  98 84028   9 33115   5  1220  98 278090  27 360.5   6
Latency             19134us     244ms     151ms   17215us   23788us     689ms

ISCSI device (on that backing device)

Version  1.96       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
xenserver-gama 300M   909  99  2847   0  6922   1  1221  98 56980   4 150.5   3
Latency             11039us      104s   29570ms   27660us     109ms     313ms