On Tue, 26 Apr 2005 at 3:05pm, Seth Bardash wrote
> Centos 4.0 has the driver built in.
>
> We recommend you install 4.0 and then build the latest (9.2) driver and
> firmware from source (you must set up your kernel source tree to match the
> running kernel).
>
> Build it with the firmware in the driver so that at the next boot it will
> upgrade the firmware. See 3ware's web site on how to do this. We will be
> adding a page that describes this in detail in the future.
>
> Once built, you need to copy it to the appropriate
> /lib/modules/kernel_version/kernel/drivers/scsi directory.
>
> Then run mkinitrd to create a new initrd image. Name it something else that
> is NOT the default.
>
> edit grub.conf and add a copy of the existing boot entry but change the
> initrd image entry to match the new image created above.
>
> Reboot and test it to make sure it works fine. If it does then save the old
> image as file.old and name the new one the same name as the original old
> one. Then delete the grub.conf entry you made for testing and you will be
> good to go.
>
> After you have all this running then install the latest version of 3dm2 from
> 3ware's site.
All good advice, except for the fact that upgrading my daul 9500-12 system
from the 9.1.5.2 codebase/stock centos-4 driver to the 9.2 codebase
(including driver) utterly killed the performance. The 9500s are set up
as RAID5 w/ a hot spare, and I do a software RAID0 stripe across them.
These are tiobench numbers before "upgrading" (units are MB/s):
Read, 1 thread: 428.8
Read, 2 thread: 586.7
Read, 4 thread: 541.5
Read, 8 thread: 462.9
Write, 1 thread: 151.7
Write, 2 thread: 156.8
Write, 4 thread: 148.6
Write, 8 thread: 148.5
And after:
Read, 1 thread: 433.4
Read, 2 thread: 608.1
Read, 4 thread: 508.6
Read, 8 thread: 398.6
Write, 1 thread: 33.7
Write, 2 thread: 31.6
Write, 4 thread: 31.4
Write, 8 thread: 30.5
The bonnie++ results look even worse:
"Old" codeset:
Read: 340.6
Write: 173.5
"New" codeset:
Read: 134.5
Write: 35.6
I've got a request into 3ware for support, but no response yet.
--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University
