Hi Radek ,
I do not see any showstoppers to the configuration that you had mentioned above. Keep in mind that SQL 2012 AlwaysOn AG is supported by only SMSQL 6.0 .
With this version of SMSQL 6.0 you have the Availability Group Database Backup option .This feature will allow you to back up AG databases across servers in a single operation and no need to take
backups on each individual node.
The backup job is assigned to the SQL Server agent on the driving server or from the host from where the SMSQL wizard launches the backup . Also keep in mind to have the secondary replicas Readable Secondary property for the replica to Yes.
There were few points which I had discussed in TR 4003
AlwaysOn introduces the following enhancements:
Provides enhanced failover functionality using Windows Server Failover Clustering (WSFC)
Eliminates the requirement for shared storage and removes the single point of failure.
Offers multiple availability databases, compared to database mirroring.
Features AlwaysOn listener service, which accepts all requests to database availability groups .
Can expand over multiple subnets
Gives the option to offload backup and maintenance operations to a read-only replica database
Offers support for both synchronous and asynchronous nodes
Using this version of SnapManager 6.0, users can:
Create Snapshot based full backup and transaction log backup on SQL Server 2012 user databases
Create stream-based full backup and transaction log backup on SQL Server 2012 system databases (except tempdb)
Perform restore on SQL Server 2012 databases, including restoring a Snapshot full backup and applying transaction log backups
Perform up-to-the-minute restore, point-in-time restore, and restore-to-mark restore .
Create federated full backup and federated log backup with SQL Server 2012 databases included in one or more federated groups along with databases from other versions of SQL Server instances .
Create clone databases on SQL Server 2012 instances.
Automatically refresh the clone database on a SQL Server 2012 instance
Automatically delete the cloned database on a SQL Server 2012 instance when it is no longer needed
I would also recommend you to check IMT for the latest supported configurations for Vsphere,VSC ,SDW and other softwares for SQL 2012 AG on VMware.
Regards,
AB