We are getting ready to deploy Hitachi's HCP archiver which basically archives 
data on our NAS that hasn't been accessed in a certain amount of time. It does 
this by moving the blocks to lower-tier storage and placing a stub file in its 
place on the NAS. Any subsequent reads of that stub file will result in the 
file being "unarchived" (this is all transparent to the client and happens on 
the back end). So to prevent netbackup from causing files to be "unarchived" 
during backups we will need to deploy the following NDMP settings:

NDMP_BLUEARC_EXCLUDE_MIGRATED = Y
NDMP_BLUEARC_EXTERNAL_LINKS = recreate_link

My question is, does anyone know the impact these settings will have on NDMP 
overhead/performance? We have multiple 12TB volumes with large numbers of files 
and I'm concerned this will become even more of an issue. It's gotta add some 
kind of overhead, I'm just concerned on how much.

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