[CentOS] LSI/3ware 9750-4i and multipath I/O

Sat Jan 14 23:55:29 UTC 2012
Vahan Yerkanian <vahan at arminco.com>

On Jan 15, 2012, at 3:52 AM, John R Pierce wrote:

> On 01/14/12 2:32 PM, Vahan Yerkanian wrote:
>> Going back to the LSI website to check if these 9750 have an option to link their caches into one...
> 
> I was curious, *all* the LSI sAS RAID cards say 'single controller 
> multipathing', both the megaraid cards and the 3ware cards (I'm setting 
> up a server that has a 9260-8i now).   I looked at their optional 
> software, and none of it implements any sort of multi-controller failover.
> 
> If you have split or multiple storage backplanes/enclosures, I"d split 
> the disks between the two cards, and multipath between each controller 
> and its respective disks.  this will take another set of SAS cables, of 
> course
> 

At the moment I have two 9750-4i installed, each having a sff8087 x4 cable going to the same backplane containing dual-port sas disks.

This was supposed to be a load balanced, multi-controller failover setup.