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RE: AMI megaraid performance (was: RE: Dell release of Redhat 7.2 )

To: "'Seth Mos'" <knuffie@xxxxxxxxx>, Matt_Domsch@xxxxxxxx
Subject: RE: AMI megaraid performance (was: RE: Dell release of Redhat 7.2 )
From: "Gonyou, Austin" <austin@xxxxxxxxxxxxxxx>
Date: Fri, 9 Nov 2001 13:08:49 -0600
Cc: Linux-PowerEdge@xxxxxxxx, linux-xfs@xxxxxxxxxxx
Sender: owner-linux-xfs@xxxxxxxxxxx

-- 
Austin Gonyou
Systems Architect, CCNA
Coremetrics, Inc.
Phone: 512-796-9023
email: austin@xxxxxxxxxxxxxxx 

> -----Original Message-----
> From: Seth Mos [mailto:knuffie@xxxxxxxxx]
> Sent: Friday, November 09, 2001 4:21 AM
> To: Matt_Domsch@xxxxxxxx
> Cc: Linux-PowerEdge@xxxxxxxx; linux-xfs@xxxxxxxxxxx
> Subject: Re: AMI megaraid performance (was: RE: Dell release of Redhat
> 7.2)
> 
> 
> Cross posting to linux-xfs@xxxxxxxxxxx
> 
> At 15:48 8-11-2001 +0100, Seth Mos wrote:
> >On another note, the newer 1.61j firmware for the PERC2/3 
> card is a decent 
> >speed improvement on raid 10 arrays. We just got a 13MB/sec 
> extra read 
> >speed (from 58MB/s to 71MB/s).
> >
> >The amount of Random seeks was significantly reduced from 
> 7500 to 5000
> >
> >Bonnie 1.0    -------Sequential Output-------- ---Sequential Input-- 
> >--Random--
> >               -Per Char- --Block--- -Rewrite-- -Per Char- 
> --Block--- 
> > --Seeks---
> >Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU 
> K/sec %CPU  /sec 
> >%CPU
> >1.61j    2000 15568 100.0 38680 20.9 27593 17.6 13745 91.0 
> 71393 18.5 
> >5001.7 23.8
> >1.57     2000 15572 100.0 38092 19.1 24619 16.0 12786 84.9 
> 58874 14.7 
> >7541.5 26.4
> >
> >RH Linux 7.1+XFS 6x72GB RAID 10 on AMI MegaRaid (493) dual 
> 1.13Ghz 2Gb ram
> 
> As a followup I tested the new firmware against different 
> kernel versions 
> and behold.
> 
> The 2.4.9-12 kernel is the RedHat kernel that was released as 
> a security 
> update.
> The 2.4.14 kernel is the linus kernel. The filesystem is XFS 
> on both versions.
> 
>                -------Sequential Output-------- ---Sequential Input-- 
> --Random--
>                -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- 
> --Seeks---
> Machine   MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU 
> K/sec %CPU  /sec %CPU
> 2.4.9-12 2000 15568 100.0 38680 20.9 27593 17.6 13745 91.0 71393 18.5 
> 5001.7 23.8
> 2.4.14   2000 11999 79.2 34491 23.8 18538 16.7 13615 90.1 
> 89704 22.6 5493.9 
> 23.3
> 
> The read speed with the newer 2.4.14 kernel is 18MB/sec faster then 
> 2.4.9-12 kernel from redhat. Now I suspected that the new 
> Andrea VM should 
> make some difference but this is significant.
> What is odd however is that the write scores are lower across 
> the board.
> 
> 2.4.9-12:       megaraid: v1.17a (Release Date: Fri Jul 13 
> 18:44:01 EDT 2001)
> 2.4.14: megaraid: v1.18 (Release Date: Thu Oct 11 15:02:53 EDT 2001
> 
> When running Bonnie over a ssh modem link where the latency 
> is higher the 
> benchmark scores plummet which suggests that tty latency is 
> affecting disk 
> througput. Very strange.
> 
> Cheers
> 
> --
> Seth
> Every program has two purposes one for which
> it was written and another for which it wasn't
> I use the last kind.
> 


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