I have a 2012 R2 cluster that was just rebuilt from a 2012 cluster. The storage is a Dell MD3200 SAN storage array. To set up access properly to the array multi-pathing has to be setup. MPIO was installed by adding that feature and then Dell's MDSM (modular disk storage manager).
In running the cluster validation I am now getting errors saying that the versions of DSM named Microsoft do not match between the two nodes.
It shows on each node there is a Microsoft DSM and a DSM from the hardware vendor (Dell). The versions of each company's DSM do agree between nodes but the versions between Microsoft and Dell are different of course.
I thought MPIO was needed so the array looked like one disk and that the MDSM was needed to do any management of the array. But now I believe that both DSM's are not needed so now I'm wondering which to get rid of. It seems like I should have the vendor DSM installed rather than MS. I just don't want to mess up anything by uninstalling MPIO.
Since I have both DSMs on there, will there be any problems caused by uninstalling MPIO and leaving the Dell DSM?
Jonathan