We are looking at upgrading from ESX 4.1 U1 -> 5.1 in the coming months and im wanting to know if the database can be placed on a SQL cluster. I cant find much about this on the web.
I cant find any documentation on this,
From this blog it states its NOT Supported - http://longwhiteclouds.com/2012/10/22/clustering-support-on-vcloud-director-and-vcenter-databases/
But from this communities it say Supported - http://communities.vmware.com/thread/400259
suggest to check with VMware Support to get a definite answer
You may choose to protect VMware vCenter Server using third-party clustering solutions including, but not limited to, MSCS (Microsoft Cluster Services) and VCS (Veritas Cluster Services). VMware does not certify these third-party solutions. VMware will offer best effort support for any issues encountered with an environment that uses third-party solutions for protecting against VMware VirtualCenter downtime. However, if your issue is determined to be related to the third-party clustering solution, VMware will refer to our third-party software policy.
Running vCenter Server with a clustered database (be it RAC or SQL with Microsoft Failover Clustering) although it may work, it is not tested and therefore not supported by VMware (as from vSphere 4.0). This situation may well change in upcoming releases of vCenter so it would pay to look out for changes in the release notes. The supported protection options currently are VMware HA and vCenter Server Heartbeat.