Lets not call it compression. Compression is still 2x typically.

I can claim 500x or 1000x deduplication if my data "rarely" changes.


-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Jeff
Lightner
Sent: Tuesday, April 08, 2008 2:57 PM
To: Michaels, Keith R; veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Measuring redundant backup data


I don't know a way to measure how much is "redundant" easily.  Maybe the
much vaunted Aptare would have that - I'll wait for their fan club to
comment on that.  :-)

However, the fact that deduplication devices (block level) seem to be
providing reported compressions from 40 to 1 to 80 to 1 on this list would
seem to indicate there is one heck of a lot of "redundancy".  

So far it appears to us the deduplication devices are living up to or
exceeding expectations.

Of course for critical systems and DR purposes you still want an offsite
strategy.   Either duplicating to tape or having a remote unit to which
you can transfer the deduplicated data.


-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Michaels,
Keith R
Sent: Tuesday, April 08, 2008 5:44 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Measuring redundant backup data

In a traditional Netbackup shop with monthly fulls and daily incrementals,
there could be 12 copies of files over the course of a year.  There are
various ways to eliminate duplication but the first step is to measure it.
Is there an effective way to measure how much of the backup volume is
actually redundant?  There may be a minimum number of copies needed in case
a tape fails, and there may be offsite copies needed as well.  I am just
interested in the redundant copies to justify further investigation into
deduplication technologies.  What tools can measure it? Thank you!


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