"Auto assign enables or disables (default) auto assign for a LUN. Auto assign controls the ownership of the LUN when an SP fails in a storage system with two SPs. You enable or disable auto assign for a LUN when you bind it. You can also enable or disable it after the LUN is bound without affecting the data on it.  With auto assign enabled, if the SP that owns the LUN fails and the server tries to access that LUN through the second SP, the second SP assumes ownership of the LUN to enable access. The second SP continues to own the LUN until the failed SP is replaced and the storage system is powered up. Then, ownership of the LUN returns to its default owner. If auto assign is disabled in this situation, the second SP does not assume ownership of the LUN, and access to the LUN does not occur.  If you are running failover software on a server connected to the LUNs in a storage system, you must disable auto assignment for all LUNs that you want the software to fail over when an SP fails. In this situation, the failover software, not auto assign, controls ownership of the LUN in a storage system with two SPs."  Next point - Yes, you can change SP ownership of your LUNs, but (and it is a huge but) if your LUNs are currently presented to a host, you could lose access if you do not have failover software properly running (e.g. PowerPath). Your zoning must also be correct or you may not be able to access the LUNs.  If you right click on a LUN and go to Properties, there are options related to ownership. You can change the default owner of each LUN you want to move, but that will not move the LUNs to the other SP. If you right click a LUN and select Trespass, the LUN will immediately change ownership.  You should do the necessary research to make sure you do not cause DL/DU during your ownership configurations.  Thanks Sameeksha
I have set the LUN Default Owner to SP B, but its current owner is still SP A.  How can I make its current owner switched to SP B?
CX3-10c LUN Current Owner and Default Owner