Re: Linux Software RAID5 - ballpark numbers

On Wed, 31 Jan 2007 15:05:50 +0000, Rohan Beckles <rohan.beckles@xxxxxxxxxx> wrote:

....
The four Hitachi 7K250s each averaged around 22.5MB/s write speed. The
Seagate averaged just over 23MB/s. The two Western Digital units each
averaged 30MB/s.

When I configured these as a RAID5 array, and did a copy of the same file
from the same source, the average write speed was 10Mb/s. Changing the
chunk size made absolutely no difference. The RAID 5 array was mounted
normally, i.e. buffered.

If I reconfigure the array as RAID0 (1.6TB capacity) I get an average
buffered write speed of around 12MB/s.

What chunk size are you using?
What benchmark program are you using?
Have you tried other file systems such as ext3, reiserfs, or xfs?

.