Thanks for the response.

This may be a silly question, but where/what is the bottleneck in the re-hydration process?  The CPU on the controller?  The disks?

I don't really see extra CPU activity that matches the time of the dump.

On Dec 21, 2012, at 9:30 AM, Fred Grieco <fredgrieco@yahoo.com> wrote:

Yes.  Dedupe is at the block level, but NDMP is a file level backup.  So an NDMP-based backup is backing up "hydrated" file data.  A block level backup (really only snapvault/snapmirror are available for Netapp) would be faster.  But then again, there are efficiencies with compression during most backups...

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From: Scott Eno <s.eno@me.com>
To: Toasters <toasters@teaparty.net>
Sent: Friday, December 21, 2012 9:12 AM
Subject: question about NDMP dumps

In investigating why an NDMP dump over 10GbE isn't going as fast as it seems it should, a question arose.  Does the data being dumped via netbackup to a data domain device, 1.58TB deduped down to 813GB, have to get re-hydrated as the dump proceeds?  And, if so, would that impact the speed of the dump?
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