What storage are you using? -- An IBM DS3524 - DS3500 series.
What is the Storage Array Type set to for the SAN LUNs on each of the hosts? -- One host is using VMWARE and the other is using vmwaretpgsALUA
What about the Path Selection Policy? -- Both are set to MRU.
My original question is if both host need to be set to ALUA, or having them with VMWARE and vmwaretpgsALUA will cause the issue we are experiencing, where the ALUCA configured host disconnects from SAN completely.