IBM RDAC or multipathd?
 

Greetings!
İ'm planning to build a RHEL ( 6.3) server with multipath to SAN storage ( IBM). What you'd advice to use, native OS multipath tools or install RDAC driver?
In RHEL 5, i always used RDAC drivers, as native tools were not functioning correctly. Has anything changed in latest version of RHEL?

That question would be best asked of IBM, honestly. The way they change things and what the consider 'compatible', varies wildly. And given it's IBM, you may need the $870,000 firmware upgrade to get things working (well, may be exaggerating a bit about the price...but they are expensive).

I'd go with RDAC personally, but I'd get something from IBM (IN WRITING) about native multipathing being supported, and find out about any known bugs/issues before trying it. I've been left twisting in the wind by IBM before.

A bit late I know but I did want to mention we use native multipath extensively in RHEL5 and RHEL6 for our Hitachi VSP array and don't have issues.

That suggests as did the prior poster that if you're having issues with IBM storage it is an issue of incompatibility between IBM and native multipath rather than an issue with multipath itself.

Installed OS with native multipath tools. It works. But taking into consideration not having enough time and resources to test extensively, remote location of servers and lack of experts with linux knowledge at that location, i chose to stop on a solution that work on production servers no - IBM RDAC.
Thanks, guys, for comments!