Installation guide

Advanced Memory Resources
The Advanced Memory Resources page lets you set low-level options that involve distribution of virtual
machine memory to NUMA memory nodes.
This page appears only if the host utilizes the NUMA memory architecture. Because affinity settings are
meaningful only when used to tweak the performance of a specific set of virtual machines on one host, this
page also is not displayed when the virtual machine resides on a DRS cluster. The option values are cleared
when the virtual machine is moved to a new host.
NUMA memory node affinity enables fine-grained control over how virtual machine memory is distributed
to host physical memory. Checking all the boxes is the same as applying no affinity.
Consult the Resource Management Guide for details about NUMA and advanced memory resources.
NOTE Specify nodes to be used for future memory allocations only if you have also specified CPU affinity. If
you make manual changes only to the memory affinity settings, automatic NUMA rebalancing does not work
properly.
Associate Memory Allocations with a NUMA Node
Use the Resources tab in the Virtual Machine Properties dialog box to associate memory allocations with a
NUMA node.
Procedure
1 Select the Resources tab, and select Memory.
2 In the NUMA Memory Affinity panel, set memory affinity.
Disk Resources
The Disk Resources panel lets you allocate host disk I/O bandwidth to the virtual hard disks of this virtual
machine.
Disk I/O is a host-centric resource and cannot be pooled across a cluster. However, CPU and memory resources
are much more likely to constrain virtual machine performance than disk resources.
Change the Disk Settings of a Virtual Machine
You can adjust the host disk allocation for a virtual machine.
Procedure
1 Click the Resources tab.
2 Select Disk in the Settings list.
3 In the Resource Allocation panel, select the virtual hard disk from the list.
4 Click in the Shares field. Use the drop-down menu to change the value to allocate a number of shares of
its disk bandwidth to the virtual machine.
Shares is a value that represents the relative metric for controlling disk bandwidth to all virtual machines.
The values Low, Normal, High, and Custom are compared to the sum of all shares of all virtual machines
on the server and, on an ESX/ESXi host, the service console. Share allocation symbolic values can be used
to configure their conversion into numeric values.
5 Click OK to save your changes.
vSphere Basic System Administration
158 VMware, Inc.