>But it could take a long time to scan all the online DASD.

Processing SMF data is not a quick process.
We do it successfully with HSM in parallel tasks for 9.5TB.


>An how can you be sure that you really found all the changed files?

If I lost SMF, how can I be sure.
You also have to make an assumption that your definitions and the software are 
both correct.
Either for HSM or for VFI.

When in doubt.
PANIC!!    

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