Tape drive, tape drive recording system, and method for selecting improved tape speed in response to intermittent read requests

摘要

A tape drive, tape drive recording system, and method are provided for improving tape speed selection during data transfer. The tape drive includes a buffer, a tape for recording the data to be temporarily stored in the buffer, and a read head. The tape drive further includes a reading controller that initially sets a tape speed such that a drive transfer rate matches a host transfer rate as closely as possible and that drives the tape at the tape speed. To address backhitching caused by one or more host transfer halts, the reading controller subsequently adjusts the tape speed such that the drive transfer rate is lower than the host transfer rate by recalculating the host transfer rate in consideration of the host transfer and the host transfer halt and setting the tape speed such that the drive transfer rate matches the recalculated host transfer rate as closely as possible.

主权项

1. A tape drive for transferring data to a host, the tape drive comprising:
a buffer for temporarily storing data to be transferred to the host; a tape for recording the data to be temporarily stored in the buffer; a read head for reading the data recorded on the tape and sequentially storing the data in the buffer; and a reading controller for initially setting a tape speed according to a first host transfer rate, driving the tape at the tape speed, measuring an amount of data stored in the buffer during a host transfer halt subsequent to a host transfer, determining whether the buffer is full of data, and, upon determining that the buffer is full of data, adjusting the tape speed such that a drive transfer rate is lower than the first host transfer rate by calculating a second host transfer rate in consideration of the host transfer and the host transfer halt and setting the tape speed according to the second host transfer rate, wherein the reading controller calculates the second host transfer rate on the basis of measured backhitching attributes resulting from the host transfer halt.