Information Technology Reference
In-Depth Information
value establishes a relative priority as a ratio of the total number of shares assigned, while the
Limit value dei nes the upper ceiling on the number of I/O operations per second (IOPS) that a
given VM may generate. As with memory, CPU, and network I/O, vSphere provides default set-
tings for disk shares and limits. By default, every VM you create is assigned 1,000 disk shares
per virtual disk and no IOPS limits.
If you need different settings than the default values, you can easily modify either the
assigned storage I/O shares or the assigned storage I/O limit.
Assigning Storage I/O Shares
Modifying the default storage I/O Shares value is done on the VM's Edit Settings dialog box,
just as it's done for modifying memory allocation or CPU utilization. Figure 11.26 shows the disk
shares for a VM.
Figure 11.26
Storage I/O shares
are modifi ed from
the same area as
other resource allo-
cation settings are
modifi ed.
Perform the following steps to modify the storage I/O Shares value for a VM:
1.
Launch the Web Client, if it is not already running, and connect to a vCenter Server
instance.
2.
Navigate to either the Hosts And Clusters or VMs And Templates view.
3.
Right-click the specii c VM for which you'd like to change the storage I/O settings and
select Edit Settings from the context menu.
4.
Click the triangle next to the hard disk. This displays the dialog box shown previously in
Figure 11.26.
