accessing rarely used files - diskXtender

Question

Hello ! Due to I'm first time here, I hope this is the right place. I have to design application which must walk rarely used files (which all resides on the most outer level - tapes) without changing their state under diskXtender. 'walk' means one pass sequential read of whole file One approach is to pull every file to local system, read it, and then change its state so that disXtender will push it to the outmost place sooner or later.. Better approach is just to get somehow the whole content of the file to some system for processing so that diskXtender is not aware about connection between content and file. The questions are: How to start ? Which documentation to read? Are there any examples? I will use C (gcc). Does it exists something like SDK for diskXtender ? Thanks in advance, Stefan

stefank2 · Answer

Because there is no answer to my questions and I'm in hurry, I made some investigation. Here are answers, maybe will help someone in the audience.

There is no diskXtender API on Linux. I will use commands migin, migout and migpurgestate instead. Procedure is as follows:

- call migpurgestate an remember the answer
- migin the file
- do processing
- regarding the result from migpurgestate either leave the file where it is or do migout and maybe purge.

This procedure will roughly keep the state of file as diskXtender see it. If you see anything wrong in this procedure let me know. Thanks

DiskXtender

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