Since XenServer 5.5, LVM storage repositories have used Microsoft's VHD technology, providing support for fast cloning and snapshots.
LVM storage repositories created with older versions of XenServer can be upgraded quickly and simply to LVHD format in XenCenter and using the XenServer xe command line interface (CLI). SRs that can be upgraded will be flagged with the message This SR needs upgrading in the General and Search tabs.
Note that the storage upgrade operation cannot be undone.
Select the SR and do one of the following: