Re: [Veritas-bu] Deduping with Tape as a final destination

All of the deduplication products available currently provide
deduplication only at the disk STU. Whether you use their mechanisms or
NetBackup Vault to later copy that data off onto tape media, the data
written to tape will be "reduplicated".

A DataDomain sales rep mentioned, when a coworker pursued this same
question some time ago, that they knew of various customer requests to
maintain deduplication on tape media, but it's not something NetBackup
currently provides a way to manage (remember that deduplication devices
are essentially black boxes for NetBackup: they're taking care of the
hashing of data, but on recovery they're recovering the full data set,
and the same thing when you run a duplication job to tape), and it's a
questionable desire with regards to DR strategy.

I certainly see how it sounds attractive for media purchasing and slot
space at Iron Mountain, but it does change the meaning of a tape back
for DR purposes and the way you'd use that backup.


--
gabriel rosenkoetter
Radian Group Inc, Unix/Linux/VMware Sysadmin / Backup & Recovery
gabriel.rosenkoetter AT radian DOT biz, 215 231 1556 


-----Original Message-----
From: mbpettis [mailto:netbackup-forum AT backupcentral DOT com] 
Sent: Saturday, April 26, 2008 3:55 PM
To: VERITAS-BU AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Deduping with Tape as a final destination


So, ultimately, the data copied to the tape will be the full amount of
the data and not the deduped data?  For example, the original 100GB
deduped down to 20GB will be the full 100GB and not the 20GB? Or will it
be the 20GB, with Netbackup referring back to the index and/or base
data?

Thanks,
Michael

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