Test Ceph RBD + iSCSI performance

# 在 local
root@ubuntu1104-64-5:/mnt$ dd if=/dev/zero of=testfile bs=4096 count=10000 conv=fdatasync
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 4.41257 s, 9.3 MB/s

# 在 local 測 rdb image
root@ubuntu1104-64-5:/mnt$ dd if=/dev/zero of=testfile bs=4096 count=10000 conv=fdatasync
10000+0 records in
10000+0 records out
40960000 bytes (41 MB) copied, 3.79785 s, 10.8 MB/s

# 用 Client 端測 rdb

root@ubuntu1104-64-6:~# dd if=/dev/zero of=testfile bs=4096k count=100 conv=fdatasync
100+0 records in
100+0 records out
419430400 bytes (419 MB) copied, 4.2075 s, 99.7 MB/s
root@ubuntu1104-64-6:~# dd if=/dev/zero of=testfile bs=4096k count=1000 conv=fdatasync
1000+0 records in
1000+0 records out
4194304000 bytes (4.2 GB) copied, 40.8692 s, 103 MB/s

# local 
root@ubuntu1104-64-5:~# dd if=/dev/zero of=testfile bs=4096k count=100 conv=fdatasync
100+0 records in
100+0 records out
419430400 bytes (419 MB) copied, 4.59282 s, 91.3 MB/s