The File Access Redirection Design And Realization In Hierarchical Storage Management System

Now the world information industries rapid development, the numerical information data fast growth causes the enterprise to enlarge unceasingly in the stored expenses.The graduation memory management proposed not the commonly used numerical information will be moved to the price relatively cheaper near line storage device and in the off-line storage device, will automatically carry on the visit frequency analysis through the graduation memory management system management system to the document, and according to the use factor decided will unload and put in storage the relevent position, but the document storage location change to the user will be transparent. Like this effective reduced the memory cost, but is limited to the memory system overall performance influence.This article has analyzed the graduation memory system architecture and the design criterion, designed and has realized a graduation memory management system management system (HSM, Hierarchical Storage Management) under the Linux system document monitoring technology and the file archive redirection detection.Meanwhile through to the data class, the information appraisal, the data migration as well as the data accessing, and so on the key technologies research, enabled HSM to have the very high serviceability and the highly effective performance.This article with emphasis elaborated under the Linux document monitoring technology and the redirectional realization, has analyzed under the existing realization Linux system document monitoring related technology, compared with aspect and so on their performance and serviceability fit and unfit quality, proposed one kind suits the graduation to save the document monitoring method which, the performance optimizes. In order to cause the procedure to have nothing to do with the Linux essence edition, applied one kind of essence to be possible to load the module the way, should monitor the document through the regular scanning the document condition information, and calculates its Hash value, afterwards compares the Hash value which two scannings obtains, in Hash value different situation, explained the document has been visited, again concrete document information item by item comparison which obtains these two scannings, obtains the document operation type.Like this compares with each time directly the quite detailed information, reduced the computation work load greatly, has saved the system resources.The document redirection detection module the information which sends in through the analysis document monitoring module, the judgment document is an ordinary document is an address way namely whether already migrated, if were the ordinary document direct visit. If will be the pathname, then the redirection detection file archive, will operate courses the document actual memory address.