For ESXi versions 4.0, 4.1, 5.0, 5.1 and 5.5, VMware highly recommends you to update ESXi hosts to ESXi 5.5 Update 3b while managing them from v Center Server 5.5 Update 3b.Virtual Disk Development Kit (VDDK) 5.5.3 adds support for ESXi 5.5 Update 3 and v Center Server 5.5 Update 3 releases. Virtual SAN does not support clusters that are configured with ESXi hosts earlier than 5.5 Update 1.Organizations running an earlier version of Backup Exec can theoretically still perform an in-place upgrade if Backup Exec is running on a 64-bit OS, but a multistep upgrade would be required.This means the organization would have to perform a preliminary upgrade to version 2010 R3 or higher, and then a secondary . During a silent upgrade, the user is not prompted to download and start the upgrade.However, the user is prompted to confirm that he or she wants to perform the upgrade.
Oftentimes, you can force a service to start by right-clicking on it and choosing the Start command from the shortcut menu.
Make sure all hosts in the Virtual SAN cluster are upgraded to ESXi 5.5 Update 1 or later, before enabling Virtual SAN.
v Center Server should also be upgraded to 5.5 Update 1 or later.
The following services need to be running: Oftentimes, you can force a service to start by right-clicking on it and choosing the Start command from the shortcut menu.
If that doesn't work, check the Application and System logs in the Event Viewer.