Garl R. Grigsby wrote:
> How do you measure harddrive performance?
The quick and dirty way. I use dd* to stream a fixed amount of data
off the disk and time how long it takes. Then I divide the amount of
data by the time to get the rate.
E.g.,
root@jogger-egg ~# time dd if=/dev/hda of=/dev/null bs=1024k
count=1024
1024+0 records in
1024+0 records out
0.010u 13.850s 0:48.14 28.7% 0+0k 0+0io 105pf+0w
root@jogger-egg ~# bc
1024 / 48.14
21.27129206481096800997
That dd command copied 1 Gb from the hard drive to the null device, in
1024 blocks of 1 Mb each. It took 48 seconds. Dividing out shows
that it's just over 21 Mb/sec.
* Double bonus old-fart points to anybody who knows what dd stands for...
--
K<bob>
[EMAIL PROTECTED], http://www.jogger-egg.com/
