We are currently running ESXi 6.0 U3 with CUCM 10.5.2 SU4. We are looking to upgrade to 12.5, however the ESXi requirement of 6.5 is causing us some headaches with our older SAN which does not support 6.5. Is there a way to install CUCM 12.5 on the ESXi 6.0 U3? Has anyone tried it? Does anyone know what issue was found that is forcing the CUCM to only support 6.5 U2?
I just completed upgrading my Call Manager lab to 12.5 and thats on ESXI 5.5, didnt have any issues with the upgrade process, although there was one additional COP file I needed to upload via SFTP for Unity Connection v11.5 upgrade to v12.5, this COP file addresses a defect CSCvi08763.
I haven't discovered any other issues yet but it is a lab and as for production environment I wouldn't consider using anything below ESXI 6.5 for v12.5, triple check recommended design guides etc