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2007-10-08
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2KB
From: roland <devzero@web.de>
To: rick@linuxmafia.com
Date: Thu, 23 Nov 2006 00:11:28 +0100
X-Mailer: Microsoft Outlook Express 6.00.2900.2869
Subject: SAS Drivers
Hi Rick,
regarding http://linuxmafia.com/faq/Hardware/sas.html
>HP Smart Array 6x and 5x Series plus P600, P400, P400i, E200, E200i,6400,6400EM
>(and no doubt other) HBAs: Compaq cciss driver. Note that some other(non-SAS?)
>Smart Array cards use the mptlinux driver set, being based on MPT Fusion
>chipsets; there may be some SAS variants based on that chip family.
Yes, for example HP LSI 3041E (PCI-Express) or 3041X (PCI-X)
regards
Roland Kletzing
System Engineer
Date: Wed, 02 Aug 2006 12:59:49 -0500
From: "Mr. Berkley Shands" <bshands@exegy.com>
To: Rick Moen <rick@linuxmafia.com>
Subject: lsi 8408e SAS fix
I stumbled upon a fix for the lsi8408e SAS controller and high write
rates:
Turn off read ahead in hardware. :-)
I lose 300MB/Sec in performance, but not having to powerfail machines to
clear hangs makes quite a difference :-)
LSI agrees there is a problem, they have given me 3 sets of BIOS for the
cards and two new drivers. But just disabling read ahead did the trick.
758MB/Sec write down to 581MB/Sec, and 780MB/Sec to 820MB/Sec on the
reads.
berkley
Date: Fri, 18 Aug 2006 08:55:06 -0500
From: "Mr. Berkley Shands" <bshands@exegy.com>
To: Rick Moen <rick@linuxmafia.com>
Subject: lsi 8408E fix
The best fix (you can update your sas web page now) is under 2.6.17 or
2.6.18 to re-enable cache, set write through, and disable read ahead in
hardware. Use 128KB stripe size. There is a bug in the supermicro
h8dc8/lsi8408e interaction. The bug is not seen on tyan motherboards.
Write performance of up to 700MB/Sec and read performance back up
1.1GB/sec with 7200.10 seagates. Older sata-2 drives yield slower
numbers. the command line utility MegaCli has more functionality than
the GUI, but the GUI is better for creating the raid devices.
berkley
--
E. F. Berkley Shands, MSc