Time delayed auto-premigeration of files in a virtual data stora

Details Time delayed auto-premigeration of files in a virtual data stora Time delayed auto-premigeration of files in a virtual data stora

1997-05-29

2000-05-23

Nguyen, Hiep T.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711118, 711143, 711162, 707204, 714 6, G06F 1208

Patent

active

060675993

ABSTRACT:
A virtual data storage system provides a method and apparatus for premigrating host-originated data files initially stored in a cache storage to selected storage volumes within a storage subsystem. A premigration list includes an entry for each cache data file eligible to be premigrated, or copied, to the storage subsystem. Each entry includes a data file identifier, a cache storage location, and a premigration delay criterion. The purpose of the premigration delay criterion is to ensure that the data files are written to the storage subsystem in a timely manner, but to also allow the host processing system to subsequently re-access data files written to the virtual data storage system without interference and delay from the premigration process. The cache data files are not premigrated until the corresponding premigration delay criterion has elapsed, or exceeded a predetermined threshold. In this manner, the premigration delay criterion can be adjusted as warranted by the performance of virtual data storage system or the host processing system.

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patent: 5634109 (1997-05-01), Chen et al.
patent: 5636355 (1997-06-01), Ramakrishnan et al.

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