Adapting transfer rate of cached data to prevent stoppage of data transmission

摘要

A file system to controls access to a tape library that selectively loads and unloads a plurality of cartridges from a plurality of slots to a drive for transmitting to the file system archived data retrieved from a particular cartridge. The file system includes a cache and receives a request from a requestor to access the tape library, estimates a first data transfer rate from an anticipated tape library operation completion duration and from a capacity of cached data to be transmitted from the cache to the requestor, initiates access to the tape library, and adapts the first data transfer rate to a second data transfer rate to transmit the capacity of the cached data to the requestor throughout the anticipated tape library operation completion duration.

主权项

1. A method for adapting a transfer rate of cached data in a file system controlling access to a tape library comprising:
receiving, at the file system, a request to access the tape library; estimating, by the file system, a first data transfer rate from an anticipated tape library operation completion duration and from a capacity of cached data to be transmitted from a cache of the file system; initiating access to the tape library; and adapting the first data transfer rate to a second data transfer rate to transmit the capacity of the cached data throughout the anticipated tape library operation completion duration.