6.5.1

Create Intra-VM Anti-Affinity Rules
You can create a VMDK anti-anity rule for a virtual machine that indicates which of its virtual disks must
be kept on dierent datastores.
VMDK anti-anity rules apply to the virtual machine for which the rule is dened, not to all virtual
machines. The rule is expressed as a list of virtual disks that are to be separated from one another.
If you aempt to set an intra-VM anti-anity rule and an intra-VM anity rule for a virtual machine,
vCenter Server rejects the most recently dened rule.
If a virtual machine is subject to a VMDK anti-anity rule, the following behavior applies:
n
Storage DRS places the virtual machine's virtual disks according to the rule.
n
Storage DRS migrates the virtual disks using vMotion according to the rule, even if the migration is for
a mandatory reason such as puing a datastore in maintenance mode.
n
If the virtual machine's virtual disk violates the rule, Storage DRS makes migration recommendations to
correct the error or reports the violation as a fault if it cannot make a recommendation that will correct
the error.
No intra-VM anti-anity rules are dened by default.
Procedure
1 Browse to the datastore cluster in the vSphere Web Client navigator.
2 Click the  tab and click .
3 Select VM/Host Rules.
4 Click Add.
5 Type a name for the rule.
6 From the Type menu, select VMDK .
7 Click Add.
8 Click Select Virtual Machine.
9 Select a virtual machine and click OK.
10 Select at least two virtual disks to which the rule applies and click OK.
11 Click OK to save the rule.
Override VMDK Affinity Rules
VMDK anity rules indicate that all virtual disks in a datastore cluster that are associated with a particular
virtual machine are located on the same datastore in the datastore cluster. The rules apply to individual
datastore clusters.
VMDK anity rules are enabled by default for all virtual machines that are in a datastore cluster. You can
override the default seing for the datastore cluster or for individual virtual machines.
Virtual machines that are subject to VMDK anity rules have the following behavior:
n
Storage DRS places the virtual machine's virtual disks according to the rule.
n
Storage DRS migrates the virtual disks using vMotion according to the rule, even if the migration is for
a mandatory reason such as puing a datastore in maintenance mode.
Chapter 13 Using Datastore Clusters to Manage Storage Resources
VMware, Inc. 103