Date: Thu, 6 Nov 2003 12:10:35 -0500 From: "Prabhakaran, Rajesh" <rajeshpr@lsil.com> To: "'Jesse Guardiani'" <jesse@wingnet.net>, "Moore, Eric Dean" <Emoore@lsil.com> Cc: freebsd-scsi@freebsd.org Subject: RE: performance problem with amr driver and Perc 2/SC Message-ID: <0E3FA95632D6D047BA649F95DAB60E570345DE91@exa-atlanta.se.lsil.com>
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Even the data from our I/O performance analysis records shows similar
figure.
PERC 2/SC(466) IO processor has no hardware XOR engine,so their will be
performance lag for RAID 5.Hence adding RAM might not help, migrating to
latest U320 controller, will significantly help.
-----Original Message-----
From: Jesse Guardiani [mailto:jesse@wingnet.net]
Sent: Thursday, November 06, 2003 11:44 AM
To: Moore, Eric Dean
Cc: freebsd-scsi@freebsd.org
Subject: Re: performance problem with amr driver and Perc 2/SC
On Thursday 06 November 2003 10:58, you wrote:
> Those are the optimal performance settings for
> those respective raid levels. Please go into
> control M and makesure those are your settings.
OK. I did this, and it more than doubled my sustainable
write speed!
I went from this:
write read
2.05 MByte/Sec 12.59 MByte/Sec
To this:
write read
6.31 MByte/Sec 13.49 MByte/Sec
Also, my peak Write went from about 3MB/Sec to 11MB/Sec,
and my peak Read went from about 13 MB/Sec to 18MB/Sec.
However, this still seems slow to me for an Ultra 2 SCSI
RAID-5 array. Is there anything else I can do to speed
things up? More RAM on the Perc 2/SC? A different SCSI
RAID controller altogether?
The PowerEdge 4300 only has a 32-bit PCI bus, but I
should still be able to achieve 20 MB/Sec Write and
20-40 MB/Sec Read with the right hardware, right?
> If your still having issue, please contact
> Atul or Rajesh as they are now maintaining this driver.
>
> Eric
>
> > On Thursday 06 November 2003 10:02, you wrote:
> > > My suggestion is to go into Control M Configuration Utility:
> >
> > OK. I understand that.
> >
> > > RAID5: Write Back Cache, Normal Read Ahead, and Direct I/O
> > > RAID1: Write Through Cache, Normal Read Ahead, and Direct I/O
> >
> > I'm not sure what you're trying to say here. As I stated in
> > my original
> > post, I'm running RAID5. What do you want me to do with the Write Back
> > Cache, Normal Read Ahead, and Direct I/O?
> >
> > Thanks!
> >
[...]
--
Jesse Guardiani, Systems Administrator
WingNET Internet Services,
P.O. Box 2605 // Cleveland, TN 37320-2605
423-559-LINK (v) 423-559-5145 (f)
http://www.wingnet.net
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