| 摘要 |
<p>In order to decrease the overall cost of storing large amounts of data, systems have been developed that use a hierarchy of storage devices from fast local disks (118) to archival off-line storage (122). Such storage devices (118, 122) may be managed in a hierarchy where data that is accessed only infrequently can be moved to archival storage (122). The present invention relies on a tight integration of a hierarchical storage manager (110) into the I/O system so that remotely stored attributes (112) can be identified and tracked internally to the I/O system just like any other attributes. Implementations of the present invention may relay on a layered driver model where lower level drivers (104) detect the existence of files with remotely stored attributes (112) and then transfer control for processing I/O requests involving files with remotely stored attributes (112) to higher level drivers (100). The higher level drivers (100) then assume control to finish processing the I/O request.</p> |
