After upgrading from VMware vSphere 5.5 Update 1 to vSphere 6.0 or a later release, you must also upgrade the Virtual SAN disk format.
VMware recommends that you upgrade to vSphere 6.0 or later because the Virtual SAN feature available with vSphere 6.0 and later releases contains many performance improvements over the feature that was available with vSphere 5.5 Update 1. With vSphere 6.0 this feature also has broader HCL (hardware compatibility) support.
Upgrading a VMware Virtual SAN datastore is a multi-phase process that includes upgrading the vSphere software on each ESXi host, and then upgrading the disk format, one disk group at a time. An entire chapter of the vSphere 6 document Administering VMware Virtual SAN is devoted to the upgrade process. The steps in the following procedure outline the order of tasks to do at the ESXi host level, in vCenter Server, and at the desktop pool level, in View Administrator.
Prerequisites
- Verify that your desktop pools are using View Agent 6.0 or a later version. If your virtual machines use View Agent 5.3.x on Virtual SAN datastores, see Upgrade from Horizon View 5.3.1 on a Virtual SAN Datastore.
- In vCenter Server, verify that the following privileges are added to the Composer role:
Profile-Driven Storage: All Folder: Create Folder & Delete Folder Host: Configuration: Advanced settings
- Familiarize yourself with the Virtual SAN upgrade process. See the chapter about upgrading Virtual SAN in the Administering VMware Virtual SAN document, available at https://www.vmware.com/support/pubs/virtual-san-pubs.html.