Upgrading from VMFS3 to VMFS5 is seamless and can be performed online with active VMs. Note however, that there are drawbacks to upgrading to VMFS5:
- Datastores are accessible to ESXi 5 hosts only
- The upgrade process will not take advantage of some of the VMFS5 improvements (such as universal block size)
Upgrading to VMFS5
- In VSphere, browse to Datastores and Datastore Clusters
- Select the datastore and click the Configuration tab
- On the right, click Upgrade to VMFS-5
- Click OK to start the upgrade
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