gistfile1.eclass

[root@es01 ~]# hdparm -Tt /dev/sda1

/dev/sda1:
 Timing cached reads:   10004 MB in  2.00 seconds = 5012.25 MB/sec
 Timing buffered disk reads:   14 MB in  3.38 seconds =   4.14 MB/sec
[root@es01 ~]# dd if=/dev/urandom of=/tmp/urandom count=100000
100000+0 records in
100000+0 records out
51200000 bytes (51 MB) copied, 14.4699 seconds, 3.5 MB/s
[root@es01 ~]# 

root@rdns1:~# hdparm -Tt /dev/sda1

/dev/sda1:
Timing cached reads: 6032 MB in 2.00 seconds = 3016.76 MB/sec
Timing buffered disk reads: 112 MB in 3.01 seconds = 37.26 MB/sec
root@rdns1:~# hdparm -Tt /dev/sda1

/dev/sda1:
Timing cached reads: 6120 MB in 2.00 seconds = 3060.94 MB/sec
Timing buffered disk reads: 242 MB in 1.26 seconds = 191.90 MB/sec