My system is a 500 Mhz P3 with 2 CPUs and 512 Meg ram.
My array is faster!  Hehe :)

I have a 14 disk raid5 array.  18 Gig SCSI disks, 3 SCSI buses.

bonnie++ -u0 -g0 -n0 -s 1024
Version  1.03 ------Sequential Output------ --Sequential Input- --Random-
              -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine  Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
watkins-ho 1G  3293  97 34587  89 22306  53  3549  99 67492  63 500.1   9
dude.ro 3096M 13081  95 34159  75 12617  21 15311  92 40429  30 436.1   3

2 at the same time.  This used both CPUs.  Over 100 Meg per second reads!
watkins-ho 1G  3091  85 18593  44  9733  24  3443  97 59895  60 249.6   6
watkins-ho 1G  2980  87 21176  54 10167  23  3478  99 44525  44 384.2   9
               ----     -----     -----      ----    ------     -----
Total          6071     39769     19900      6921    104420     633.8

You win on "Per Chr", this is CPU bound since it reads only 1 byte at a
time.  This is more of a CPU speed test than a disk speed test, IMHO.
During the "Per Chr" test, only 1 CPU had a load, it was at about 100%.
My guess is you have a real computer!  Maybe 1.5 Ghz.

In the other tests your CPU usage was lower, which is good for you.

Ramdom seeks... My guess is having 14 moving heads helps me a lot on this
one!  Since my disks are old.  But they are 10,000 RPM.

The bottom line:  I don't know if my array is considered fast.  I bet my
array is slow.  Today disks are so much faster than what I have.  But I have
more of them which helps performance.

Guy

-----Original Message-----
From: linux-raid-owner@vger.kernel.org
[mailto:linux-raid-owner@vger.kernel.org] On Behalf Of Robin Bowes
Sent: Sunday, October 10, 2004 5:35 PM
To: Gordon Henderson
Cc: linux-raid@vger.kernel.org
Subject: Re: Stress testing system?

Gordon Henderson wrote:

On Sat, 9 Oct 2004, Robin Bowes wrote:

quoted

Version  1.03       ------Sequential Output------ --Sequential Input-

--Random-

quoted

                    -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--

--Seeks--

quoted

Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP

/sec %CP

quoted

dude.robinbowes 10M 11482  92 +++++ +++ +++++ +++ 15370 100 +++++ +++

13406 124

Why are you removing the speed - is it something to be embarased about?

As you found out, bonnie does this without any carbon-based intervention!

quoted

Is this normal? Should running bonnie++ result in the array being dirty
and requiring resyncing?

No - but reading some of the later replies it seems it might not have been
fully synced to start with?

On reflection, I'm pretty sure it wasn't. It is now.

Have you let it sync now and run the tests again?

Yes. It was faster when the array had re-synced :)

Ah right - I've just run that bonnie myself - it's +++'d out the times as
10MB is really too small a file to do anything accurate with and you've
told it you only have 4MB of RAM. It'll all end up in memory cache. I got
similar results with that command.

Don't bother with the -n option, and do get it to use a filesize of double
your RAM size. You really just want to move data into & out of the disks,
who cares (at this point) about actual file, seek, etc. IO. I use the
following scripts when testing:

/usr/local/bin/doBon:

  #!/bin/csh
  @ n = 1
  while (1)
    echo Pass number $n
    bonnie -u0 -g0 -n0 -s 1024
    @ n = $n + 1
  end

/usr/local/bin/doBon2:

  #!/bin/csh
  doBon & sleep 120
  doBon

and usually run a "doBon2" on each partition. Memory size here is 512MB.

OK, I've tried:

    bonnie++ -d /home -u0 -g0 -n0 -s 3096

(I've got 1.5G of RAM here - RAM's so cheap it's daft not to!)

This gave the following results:

Version  1.03       ------Sequential Output------ --Sequential Input-
--Random-
                     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec
%CP
dude.robinbow 3096M 13081  95 34159  75 12617  21 15311  92 40429  30 436.1
3
dude.robinbowes.com,3096M,13081,95,34159,75,12617,21,15311,92,40429,30,436.1
,3,,,,,,,,,,,,,

I don't actually know what the figures mean - is this fast??

R.
-- 
http://robinbowes.com

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