vSphere 5.1 update 1 is released today which contains several updates and bug fixes for both ESXi and vCenter Server 5.1.
This release contains the return of the much requested functionality of renaming VM files by using Storage vMotion. Renaming a virtual machine within vCenter did not automatically rename the files, but in previous versions Storage vMotion renamed the files and folder to match the virtual machine name. A nice trick to keep the file structure aligned with the vCenter inventory. However engineers considered it a bug and “fixed” the problem. Duncan and I pushed hard for this fix, but the strong voice of the community lead (thanks for all who submitted a feature request) helped the engineers and product managers understand that this bug was actually considered to be a very useful feature. The engineers introduced the “bugfix” in 5.0 update 2 end of last year and now the fix is included in this update for vSphere 5.1
--> Please see the rest on the blog : http://frankdenneman.nl/2013/04/26/vsphere-5-1-update-1-release-fixes-storage-vmotion-rename-bug/