Nick,
The best practices guide (and experience ) tells that when using a VTL you
should NOT multiplex, as the order in which the blocks are multiplexed are
not always the same. So in order to get a valuable deduce ratio, single
stream backups should be done.
Brecht Arteel
Op 12/05/11 17:11 schreef N.J.Tustain <n.j.tustain AT OPEN.AC DOT UK>:
>I'm trying to figure something out.
>
>Although data from a multiple client backup, is stored in separate files
>(according to SSID) on an AFTD device, which means it is effectively
>de-multiplexed.
>
>One benefit
>of the simple rule that all data in a file belongs to the same save set
>is that it enables
>clean staging of save sets to another medium.
>
>If a datadomain device is being used (non VTL) mode, is the data stream
>it de-duplicates effectively a multiplexed datastream from all the
>clients backing up at any moment.
>
>If so how can any decent de-dupe ratio be achieved, as the data stream
>it's de-duping is a random mix of each clients data, which will change
>each time the backups run.
>
>Thanks
>Nick
>
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