[idcuser@vhost0334 ~]$ time dd if=/dev/zero of=/tmp/out bs=10G count=1
0+1 records in
0+1 records out
2147479552 bytes (2.1 GB) copied, 2.90332 seconds, 740 MB/s

real    0m2.906s
user    0m0.000s
sys     0m2.906s
[idcuser@vhost0334 ~]$ dd if=/dev/zero of=/tmp/out bs=10G count=1
0+1 records in
0+1 records out
2147479552 bytes (2.1 GB) copied, 3.75155 seconds, 572 MB/s
[idcuser@vhost0334 ~]$ dd if=/dev/zero of=/tmp/out bs=1G count=10
10+0 records in
10+0 records out
10737418240 bytes (11 GB) copied, 39.4733 seconds, 272 MB/s
[idcuser@vhost0334 ~]$ dd if=/dev/zero of=/tmp/out bs=1G count=10
10+0 records in
10+0 records out
10737418240 bytes (11 GB) copied, 132.914 seconds, 80.8 MB/s
[idcuser@vhost0334 ~]$ dd if=/dev/zero of=/tmp/out bs=1G count=10
10+0 records in
10+0 records out
10737418240 bytes (11 GB) copied, 39.0068 seconds, 275 MB/s
[idcuser@vhost0334 ~]$ dd if=/dev/zero of=/mnt/hdgpfs/out bs=1G count=10
10+0 records in
10+0 records out
10737418240 bytes (11 GB) copied, 420.574 seconds, 25.5 MB/s
[idcuser@vhost0334 ~]$ dd if=/dev/zero of=/mnt/hdgpfs/out bs=1G count=10
10+0 records in
10+0 records out
10737418240 bytes (11 GB) copied, 106.496 seconds, 101 MB/s
[idcuser@vhost0334 ~]$ dd if=/dev/zero of=/mnt/hdgpfs/out bs=1G count=10
10+0 records in
10+0 records out
10737418240 bytes (11 GB) copied, 96.211 seconds, 112 MB/s