disk: dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync; unlink test
disk seek: ioping -R <volume>
network: wget -O /dev/null http://cachefly.cachefly.net/100mb.test
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 34.3329 s, 31.3 MB/s
--- /dev/xvda1 (device 8.0 Gb) ioping statistics ---
231 requests completed in 3007.1 ms, 78 iops, 0.3 mb/s
min/avg/max/mdev = 0.4/12.9/53.7/10.4 ms
100%[==============================================================================>] 104,857,600 35.3M/s in 2.8s
2013-12-04 02:11:04 (35.3 MB/s) - `/dev/null' saved [104857600/104857600]
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 4.93495 s, 218 MB/s
--- /dev/xvda1 (device 10.0 Gb) ioping statistics ---
952 requests completed in 3001.6 ms, 332 iops, 1.3 mb/s
min/avg/max/mdev = 0.1/3.0/56.6/6.2 ms
100%[======================================>] 104,857,600 36.6M/s in 2.7s
2013-12-04 02:11:15 (36.6 MB/s) - `/dev/null' saved [104857600/104857600]
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 2.31663 s, 463 MB/s
--- /dev/vda (device 20.0 Gb) ioping statistics ---
14416 requests completed in 3000.1 ms, 9029 iops, 35.3 mb/s
min/avg/max/mdev = 0.0/0.1/8.0/0.2 ms
100%[======================================>] 104,857,600 31.9M/s in 4.1s
2013-12-03 21:11:05 (24.7 MB/s) - `/dev/null' saved [104857600/104857600]