Patent ID: 6260110
Filing Date: 2001-07-10
Classification: G06F

Abstract:
In a magnetic disk storage device operating as a virtual tape device responsive to tape requests from a user program including certain tape requests that change the quantity of data on the virtual tape, a method for generating an end-of-tape return code for the user program comprising the steps of:A) defining a magnetic disk storage device volume size corresponding to a selected size of the virtual tape device,B) thereafter responding to the certain tape requests by:i) converting the certain tape request to a corresponding disk request for the magnetic disk storage device,ii) determining whether the corresponding disk request will cause the amount of data in the magnetic disk storage device to exceed the defined volume size,iii) generating a disk return code based upon said determination, andC) generating an end-of-tape return code in response to the generated disk return code when the disk request will cause the amount of data in the magnetic disk storage device to exceed the volume size.