This is currently not very clear in the release notes, but if you are already running vSphere Storage Appliance (VSA) version 5.1, you do not need to update to VSA 5.1.1. This is not needed, nor is it supported.
VSA 5.1.1 focuses solely on fixing issues found during the upgrade from VSA version 1.0. If you have successfully upgraded to 5.1, then you do not need to go to version 5.1.1.
You may run into some ‘strange’ upgrade issues trying to get from VSA 5.1 to VSA 5.1.1. For example, on 2 node clusters which use the VSA Cluster Service, the installer will abort during the upgrade with a “could not stop service” error. This is because the VSA cluster service on VSA 5.1 is called “VSAClusterService-5.1″ but the installer tries to stop a service called “VSAClusterService”, which is the name of the VSA 1.0 Cluster Service.
So, just to repeat, if you are on VSA 5.1, you do not need VSA 5.1.1. We are working on getting this called out very clearly in the release notes.
Get notification of these blogs postings and more VMware Storage information by following me on Twitter: @CormacJHogan