Hello FazzaGBR,   You can try uninstall and reinstall MDSM and check results   To get the latest MDSM use the resource DVD: Dell PowerVault MD32/MD34/MD36/MD38 Series Resource DVD [URL]       Do you know if someone copied the config off of 1 unit and applied it to the other which sets the controllers up as the same system ID?   Give this a try:  Add one to MDSM, run logs, remove it, add other, run logs, and then compare "Storage array world-wide identifier (ID)" in the storagearrayprofile.txt file of each. If they are matching  then the only way to fix is to do a factory wipe which would require call in to Support and set up a case.  
We've got 2 PowerVault MD3600f SANs that have previously only been connected to 2 different servers via Fiber only without any of the Ethernet management ports being used. We want to use the 2 SANs (properly this time) using a Fiber switch to connect to 2 servers we are going to cluster. I'm new to SANs so I'm clearly missing a step as I cannot see both of the SANs in the Dell PowerVault Modular Disk Storage Manager at the same time, I have to remove one, power it off and then power on the other SAN and then add it to MDSM and it is then shown correctly and I can then right-click on it and manage it. If I power on both of the SANs at the same time and add them to MDSM (either automatically or manually using their IP addresses of the management ports) then it only lists one of the SANs and if I hover my mouse over the name of the SAN it lists all 4 IP addresses and not just the two that each SAN has.   The first SAN we have is called THISONE and when it's the only SAN powered on it is detected OK: [IMAGE]THISONE If I power off THISONE and power on the 2nd SAN (called THATONE) then it also gets detected correctly: [IMAGE]THATONE If I power on both THISONE and THATONE I just get one of the SANs listed but it hover the mouse over it all 4 management IP address are listed: [IMAGE]THISONE and THATONE What do I need to do to get them both to show up in MDSM so I can manage them both?
PowerVault MD3600f showing up as 1 SAN and not the 2 individual ones we have