Tuesday, December 4, 2007

VMs vs. Multiple SQL Server Instances

1. Performance
VM can not provide the same level of performance as the physical machine, most estimated VM overhead is at 10% - 15%.

2. Software Patching
VM will add more OS & software patching and administrative effort.

3. Backup/Recovery & Replication
VM has the advantage on backup/recovery and replication to another machine.

4. Licensing
Multiple SQL server instances don’t require any additional SQL Server licenses. For virtualization, each SQL Server system that’s running in a guest VM must be licensed—unless you’re running SQL Server 2005 Enterprise Edition, which provides unlimited VM usage.

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