Writing and Reading Data in Tape Media

摘要

A mechanism is provided for determining storage device speed based on a ratio of data compression. A bandwidth (B) is identified between a storage device accessing storage medium and a host application requesting access to data on the storage medium. A host side transfer rate is identified, where the host side transfer rate (HSTR) is a rate of data transfer between the host application and the storage device. For each data set in a set of data sets of a record, a ratio of data compression (R) is identified for the data set; a compression considered host side transfer rate (CCHSTR) is determined; and the storage device speed is set to the compression considered host side transfer rate (CCHSTR) for transmitting the data set to the host application.

主权项

1. A computer program product comprising a computer readable storage medium having a computer readable program stored therein, wherein the computer readable program, when executed on a computing device, causes the computing device to:
identify a bandwidth (B) between a storage device accessing storage medium and a host application requesting access to data on the storage medium; identify a host side transfer rate, wherein the host side transfer rate (HSTR) is a rate of data transferred between the host application and the storage device; and for each data set in a set of data sets of a record:
identify a ratio of data compression (R) for the data set;determine a compression considered host side transfer rate (CCHSTR), wherein the compression considered host side transfer rate (CCHSTR) is determined utilizing: CCHSTR=max (B, HSTR/R); andset a storage device speed to the compression considered host side transfer rate (CCHSTR) for transmitting the data set to the host application.