Bug#678110: [squeeze] LSI 926x w/ CacheCade 2.0 Pro feature activated requires updated megaraid_sas driver module

[Jonathan Nieder <jrnieder@gmail.com>]

Thomas Baetzler wrote:

> We've recently decided to try LSI's CacheCade Pro 2.0 software
> feature package on some systems utilizing their Megaraid 9260
> controller. This feature package implements tiered storage that
> utilizes SSD drives as additional non-volatile cache. It has been my
> experience that enabling this feature with the standard Debian
> kernel leads to filesystem corruption and data loss. A kernel log
> that demonstrates this happening is attached to this bug report. It
> was created by booting from an older GRML live cd but I can vouch
> for the same thing happening with a plain Squeeze install. 
>
> I have since built a new kernel module using dkms from LSI's own
> updated driver for Ubuntu "Lucid Lynx" available at
> http://www.lsi.com/downloads/Public/MegaRAID%20Common%20Files/Ubuntu_10.04_LTS_05.30.zip.

More details:

The module version was updated from 05.29-rc1 to 05.34-rc1 in mainline
in v2.6.39-rc1~440^2~19.

 3.0.y has 05.38-rc1.
 2.6.34.y has 04.17.1-rc1.
 2.6.32.y has 04.01.
 Debian squeeze has 04.01 + some, but not all, changes up to 04.12.

I assume 3.0.y works fine.  I suppose what would be most interesting
is to try 2.6.34.y; if that doesn't work, we can work with upstream to
get it working (and if it does work, we have a much narrower range to
search for the fix).

Instructions:

 0. prerequisites:

	apt-get install git build-essential

 1. get the kernel history if you do not already have it:

	git clone \
	  git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

 2. add point releases:

	cd linux
	git remote add stable \
	  git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
	git fetch stable

 3. configure, build, test:

	git checkout stable/linux-2.6.34.y
	cp /boot/config-$(uname -r) .config; # current configuration
	scripts/config --disable DEBUG_INFO
	make localmodconfig; # optional: minimize configuration
	make deb-pkg; # optionally with -j<num> for parallel build
	dpkg -i ../<name of package>; # as root
	reboot
	... test test test ...

Sorry for the slow start, and hope that helps,
Jonathan