[wplug] Linux multipath tools

[Michael Skowvron]

Keir Josephson wrote:
> I have some experience with this. Whose storage array are you using and
> what distro? Is this on a true dual fabric layout?

The OS is SLES9-SP2 on SGI Altix and the storage is SGI TP9700 (same as 
Engenio 6998). The FC controllers are QLogic 2462 dual port.

The storage has dual controllers with 4 FC host ports/controller. There 
will be 2 luns, 1 owned by each controller. The RAID is configured to 
use automatic volume transfer (AVT). The storage will be direct 
connected to the system using either 4 or 2 paths, whichever makes more 
sense.

The most important feature the customer requires is failover, but 
distributing the luns is important too.  We must be able to manaully 
transfer the path of a lun so we can assure proper lun ownership.

SLES9 SP2 ships with multipath-tools-0.4.4. The customer was planning to 
use LVM, but I'm willing to look at other volume mangers, too. I'm used 
to working with SGI XVM multipath using RDAC mode on the RAID. The 
customer can't use XVM because the application is Oracle and the 
proprietary modules would invalidate their support.

Thanks,

Michael



> 
> -Keir
> 
> 
> 
>>Does anyone have experience using the multipath-tools package and can
>>comment on it's stability? I would be using it to distribute 4 luns of
>>an LVM volume across 4 fibre channel connections.
>>
>>Michael