I have a Server 2012 Failover Cluster for Virtual Machines configured and seems to be working fine when testing failovers, etc. This is on two hosts.

My backend SAN is a Dell MD3200 SAN (firmware fully up to date). HBAs are Dell SAS 6Gbps Dual Port with each port filled and connected to both controllers.

I can’t find any clear documentation for how to properly setup the MPIO on the Dell SAS HBA Adapters. There’s plenty of documentation on how to do it with ISCSI but I can’t see anything on SAS.

On one server where I installed the Dell Modular Disk Storage Array, in device manager the two LUNs show up as one disk each and when I right click > properties there’s an MPIO tab (see configuration). On the 2nd server, the two LUNs shows up twice (4 disks in Device Manager) and when I right click > properties there’s no MPIO tab.

1)      How do I get the 2nd server to show only one device in device manager and have the MPIO tab.
2)      What are the optimal settings for the MD3200 in these windows in the attached images? a. Fail Over Only b. Round Robin with subset c. Least Queue Depth d. Weighted Paths.
3)      Do I need to use the MPIO module installed by server manager?
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Muhammad BurhanManager I.T.Commented:
Philip ElderTechnical Architect - HA/Compute/StorageCommented:
The console in the MD3200 will list the initiators from each HBA based cable.

Set up a server group and add the initiators associated with each server to that group. Then go ahead and set up your LUNs to be shared between the nodes.

MPIO is installed using the Install-WindowsFeature Multipath-IO (IIRC).

Then either use the MPIO console to set up the LUNS or MPClaim. We use Least Queue Depth for our MD3220 Dual SAS setups.
andyalderSaggar maker's framemakerCommented:
Isn't there an "add SAS support" in MPIO manager?

I'd suspect that installing Dell MDSM adds MPIO feature and enables SAS support automatically.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.