Patent ID: 8856436
Filing Date: 2014-10-07
Classification: G06F

Abstract:
1. A method for accessing host data records stored on a virtual tape storage (VTS) system, the method comprising: receiving a mount request to access at least one host data record on a VTS system; determining a number of host compressed data records per physical block on a sequential access storage medium by calculating a result of a formula, ((A−B)*C)/D, wherein A is a physical block size on the sequential access storage medium in bytes, B is a header size of a physical block on the sequential access storage medium in bytes, C is a compression ratio for the logical volume on the sequential access storage medium, and D is an uncompressed size of the requested at least one host data record; determining a physical block ID (PBID) that corresponds to the requested at least one host data record; accessing a physical block on the sequential access storage medium corresponding to the PBID; and outputting the physical block without outputting an entire logical volume from the sequential access storage medium that the physical block is stored to.