Wednesday Aug 21, 2013

Resource allocation on vServers

A few facts to keep in mind.

The number of vCPUs to existent vServer cannot be modified. Currently vDC resource management (changing vCPU, memory, etc.) after a vServer has been created is not supported in Exalogic Virtual environments. However, a customer vServer type with required memory can be created and used instead of the default VM types.

Note that the Server pool management is handled by Exalogic, manual management of it is not available. Also, keep in mind that there is no way to control which physical host is assigned a given vServer. The scheduler algorithms are sophisticated but it is fine-grained and there is no reason to assume that the scheduler will not be maximally efficient. EMOC will look at the resources allocated to the vServer that is being planned on creating (CPUs/memory), then look at what is available on each of the compute nodes and make a decision on where to place the vServer. System administrators can try to use Distribution groups and separate the vServers they have to run across different Oracle VM Servers.

If need to increase Root File System and Swap Space of an Exalogic Guest Virtual Machine, then the MOS Note 1575790.1 is useful for that purpose.
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Principal Technical Support Engineer in the Exalogic Enterprise Support Team (EEST).

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