Mapping locations of logical volume records on a physical stacked volume

摘要

A system, method and computer program product for accessing host data records stored in a virtual tape storage (VTS) system. The computer program product includes a computer readable storage medium having computer readable program code embodied therewith. The computer readable program code includes computer readable program code configured to receive a mount request to access at least one host data record in a VTS system; computer readable program code configured to determine a starting logical block ID (SLBID) corresponding to the at least one requested host data record; computer readable program code configured to determine a physical block ID (PBID) that corresponds to the SLBID; computer readable program code configured to access a physical block on a magnetic tape medium corresponding to the PBID; and computer readable program code configured to output at least the physical block without outputting an entire logical volume that the physical block is stored to.

主权项

1. A computer program product for accessing host data records stored in a virtual tape storage (VTS) system, the computer program product comprising:
a non-transitory computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising:
computer readable program code configured to receive a mount request to access at least one host data record in a VTS system, the mount request including at least:
a block count field indicating a number of physical blocks to return; anda block size field indicating a size of each physical block to return;computer readable program code configured to determine a starting logical block ID (SLBID) corresponding to the at least one host data record;computer readable program code configured to determine a physical block ID (PBID) that corresponds to the SLBID;computer readable program code configured to access a physical block on a magnetic tape medium corresponding to the PBID based on a value in the block size field; andcomputer readable program code configured to output a number of physical blocks sufficient to encompass the at least one host data record without outputting an entire logical volume that the physical block is stored to based on the block count field.