[3381] in linux-scsi channel archive
Re: about SCSI configuration
daemon@ATHENA.MIT.EDU (Marc SCHAEFER)
Sun Feb 22 02:58:27 1998
From: Marc SCHAEFER <schaefer@alphanet.ch>
Date: 22 Feb 1998 08:34:20 +0100
Apparently-To: linux-scsi@vger.rutgers.edu
To: ;@unlisted-recipients (no To-header on input)
Michel A. Herrera Sanchez <michel@cigb.edu.cu> wrote:
> (i) Can I add a new disk of 23GB? What is the maximum amount of GB that I can
> have in my Linux box?
I did not try, but last time I tried, 18 GB seemed to work.
> (iv) Can I evaluate the performance of disk i/o access? If I can do it,
> How can i do that?
Create a filesystem with
mke2fs -b 4096 /dev/sda1
where sda1 is near the start of the disk (notches are faster there),
mount /dev/sda1 /mnt
# big file so that it does not get cached too much
and run Bonnie -s 500 -d /mnt
You should get good results (I got upto 28 MB/s read and 25 MB/s
write with a theoretically 30 MB/s RAID engine through the fs).
Using dd, time and /dev/sda1 basically does not give good figures
because of user/kernel switches.
Also I saw a software to do real-time measurements:
ftp://ftp/fridu.com/linux/bench
