Allocate storage I/O resources to virtual machines based on importance by assigning a relative amount of shares to the virtual machine.

Unless virtual machine workloads are very similar, shares do not necessarily dictate allocation in terms of I/O operations or MBs per second. Higher shares allow a virtual machine to keep more concurrent I/O operations pending at the storage device or datastore compared to a virtual machine with lower shares. Two virtual machines might experience different throughput based on their workloads.

1

Select a virtual machine in the vSphere Client inventory.

2

Click the Summary tab and click Edit Settings.

3

Click the Resources tab and select Disk.

4

Select a virtual hard disk from the list.

5

Click the Shares column to select the relative amount of shares to allocate to the virtual machine (Low, Normal, or High).

You can select Custom to enter a user-defined shares value.

6

Click the Limit - IOPS column and enter the upper limit of storage resources to allocate to the virtual machine.

IOPS are the number of I/O operations per second. By default, IOPS are unlimited. You select Low (500), Normal (1000), or High (2000), or you can select Custom to enter a user-defined number of shares.

7

Click OK.

Shares and limits are reflected on the Resource Allocation tab for the host and cluster.