Sizing Considerations
Some Cisco UCS Central customers have scaled their UCS environments from dozens to hundreds of domains and from hundreds to thousands of servers. The scaling metric to determine your needs is not the number of registered UCS domains, but rather the number of blades and servers. Cisco UCS Central has been tested to support up to 10,000 servers. There is no software limit.
If you have a large environment, analyze the performance of the Cisco UCS Central virtual machines (VMs) to determine if you need to increase the CPU and memory resources.
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Creates 2 x 40-GB disks
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Allocates 4 x vCPUs
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Allocates 12-GB RAM
For small to medium-size environments, those settings provides sufficient performance. However, for large environments we recommend increasing those resources by a factor of two. (Cisco IT runs at least 4 vCPUs and 24-GB RAM for their instance of Cisco UCS Central, which exceeds 200 UCS domains and 6,000 servers.)
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Monitor the performance metrics of your Cisco UCS Central VM in your new or growing infrastructure.
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Adjust CPU and RAM resources accordingly.
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Verify vCPU and memory usage if performance is noticeably inadequate.
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Make needed changes with your virtualization administrator.