CentOS - Nov 2008 - kickstart install on SAN with multipath

Using CentOS 5.1, though with a few hours work I could update
to 5.2.. I can install to SAN with a single path no problem
but I'd like to be able to use dm-multipath. From the kickstart
docs it seems this is supported but there is no information
as to what the various options mean

http://www.centos.org/docs/5/html/5.1/Installation_Guide/s1-kickstart2-options.html

--
 multipath (optional)

    multipath --name= --device= --rule--

I have a multipath.conf which works fine when I install to local
disk, I'm not sure what I should put in the options above, perhaps
something like

multipath --name=mpath0 --device=sda --device=sdb --rule= ???

Done tons of searches and can't find anything. Any idea what
"rule" would map to in multipath.conf ? I've even installed the
anaconda package and grepped through the code and can't find
anything useful.

thanks

nate

On Fri, 2008-11-14 at 15:06 -0800, nate wrote:
> Using CentOS 5.1, though with a few hours work I could update
> to 5.2.. I can install to SAN with a single path no problem
> but I'd like to be able to use dm-multipath. From the kickstart
> docs it seems this is supported but there is no information
> as to what the various options mean
> 
>
http://www.centos.org/docs/5/html/5.1/Installation_Guide/s1-kickstart2-options.html
> 
> --
>  multipath (optional)
> 
>     multipath --name= --device= --rule> --
Ah! I just ran through this exact scenario a week ago. Turns out in
inspecting the anaconda code I couldn't actually find any support for
that directive, it looks to be more of a placeholder, but I'm no python
wizard. 

What is does support though is auto detecting and creating a simple
multipath.conf, good enough configure lvm with during the install.

This setup can be triggered by passing 'mpath' as a kernel parameter
during kickstart.

Only other thing I had to do was add a bit of %post scripting to tweak
multipath.conf and lvm.conf for our particular drive/controller setup.
-- 
Matthew Kent \ SA \ bravenet.com