Patent ID: 8078798
Filing Date: 2011-12-13
Classification: G06F

Abstract:
1. A virtual tape server (VTS), comprising: a first host adapter through which a first host is coupled; a second host adapter through which a second host is coupled; a VTS controller; a virtual tape emulation (VTE) through which a first level storage unit is coupled, the first level storage unit having a first partition allocated to the first host and a second partition allocated to the second host; a first hierarchical storage controller (“HSC”) coupled to a first physical tape storage unit (“first tape unit”), the first HSC operable to manage removal of data from the first partition to the first tape unit; a second HSC coupled to a second physical tape storage unit (“second tape unit”), the second HSC operable to manage removal of data from the second partition to the second tape unit; a first free-space controller coupled to the VTS controller and operable to determine a total amount of free space in the first level storage unit; a second free-space controller coupled to the VTS controller and operable to determine an amount of free space in the second partition; a first throttling controller responsive to the first free-space controller and operable to manage the flow of data to the first partition; and a second throttling controller responsive to the second free-space controller and operable to manage the flow of data to the second partition; the VTS controller operable to: