Consolidating multiple SQL Server systems onto
Dell PowerEdge R610 Servers using Microsoft’s Hyper-V
9
Sizing and baseline performance. Sizing is one key to a
successful consolidation. The process of sizing involves gathering
different performance baselines so you have at least an
approximate set of requirements the new consolidated servers
must meet. You do this by looking at the performance
characteristics of existing hardware during normal business
operations, and then applying growth and scalability estimates. The
performance baselines you gather are useful when setting the
configuration options on your Hyper-V virtual machines when it
comes to the number of virtual processors and the amount of
memory.
Among the characteristics to examine on each server are the
following:
• Processor utilization
• Memory requirements of the OS and applications
• Disk layout
• Database size
• Expected database growth
• Maximum concurrent users
• Types and rates of transactions against the databases
The server you choose for virtualization and consolidation must do
more than match the combined capacity of all the other current
servers today. It must have enough excess capacity to still perform
well at the end of its expected life span. Fortunately, given the
improvements we note below, finding such servers is entirely
possible. Also, given the flexibility that virtualization provides,
future hardware upgrades are easier; you can move virtual
machines from host to host and even migrate them to newer
equipment if you so choose.
Another reason for consolidation is one that plays a role in sizing:
the typical enterprise is not using its servers at anywhere near
capacity. As Ben Pring, Research Vice President for Gartner, noted
at the Gartner Symposium ITxpo 2007, “Server utilization was also
low—at an average 18 percent in large organizations.”
In recent years, server capabilities have greatly increased. Here
are some of the improvements that make it possible to consolidate
multiple servers into a single system:
• More processors. Modern quad-core processors double or
even quadruple the number of processing cores available
per socket without increasing the physical size of the server.
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