If you configure the object space reservation then reservation will be done on the vsan datastore for the specified object or the vm on which this policy is assigned.
Vsan storage policy change.
When editing the policy you cannot change the name of the policy or the vsan storage provider specification.
Because the managed storage policy for non elastic vsan clusters varies based on cluster size adding or removing hosts will trigger a storage policy reconfiguration if it changes the size of the cluster so that it requires a different policy.
One scenario is when a new policy that requires a change in component number and or layout is assigned to a vm.
How vsan manages policy changes.
When you modify a policy the change is accepted but not applied immediately.
You cannot apply the default storage policy to non vsan datastores such as nfs or a vmfs datastore because the default virtual machine storage policy is compatible with any vsan datastore in the vcenter server you can move your virtual machine objects provisioned with the default policy to any vsan datastore in the vcenter server.
It is actually really straight forward.
Prerequisites verify that the vm storage policy you want to assign as the default policy to the vsan datastore meets the requirements of virtual machines in the vsan cluster.
Virtual san fails to provision a virtual machine when the policy requirements are not met but it successfully creates the user defined storage policy.
You can change the default storage policy for a selected vsan datastore.
Transient capacity is generated when vsan reconfigures objects for a policy change.
In both cases vsan will use additional capacity to make the necessary changes to components to comply with the assigned storage policy.
Another scenario is when an existing storage policy that is assigned to one or more vms is modified.
The vsan default policy only applies to vsan datastores.
Vsan 6 7 update 3 and later manages policy changes to reduce the amount of transient space consumed across the cluster.
You can see the list of virtual machines that use this storage policy.
You can change the default storage policy for a selected virtual volumes or vsan datastore.
In the vsphere web client.
Now the question remains how do i change the policy of a single vm.
On the vm storage policies tab click the storage policy you want to change.
All other parameters including rules are editable.
For virtual volumes and vsan datastores vmware provides storage policies that are used as the default during the virtual machine provisioning.
The policy is editable.
To edit the policy you must have the storage policy privileges that include the view and update privileges.
By changing the policy as demonstrated in the video you can simply increase the stripe width for all virtual machines.
Create a new policy go to vm storage policies.
From the vsphere web client home click policies and profiles vm storage policies.
