Disk Based (Random access) lets you have several sessions all sending data
to it.  This removes the need to queue backups like all the competitors.
But it will fragment as data expires and there is no defrag for random
access.

File devices (Sequential access) do also fragment over time, just like
tape, but you are able to run reclamation on them.  But sequential access
would cause queuing.
They each have different pro's and con's which make them suited for
different tasks.  (long term vs short term storage)

Regards,
Shawn
________________________________________________
Shawn Drew


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