Why do you hate all things dedupe?

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Kelly Lipp
Sent: Friday, March 20, 2009 10:12 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] VTL and Dedup ( TS7569G)

Funny, but I was researching the TS7650 yesterday and found this article on
the IBM website.  Pretty good detail about the product in a non-TSM
environment.

ftp://service.boulder.ibm.com/storage/tape/ts7650g_esg_validation.pdf

And then this on in the TSM environment. I think this one might have been
written by somebody somewhat less familiar with TSM than we would be.
Seemed a little heavy handed about TSM.

ftp://ftp.software.ibm.com/common/ssi/sa/wh/n/tsw03043usen/TSW03043USEN.PDF

My overall impression, and I hate all things de-dup, was this is a pretty
good product offering.  I'm sure it's way expensive but understand there are
some follow on products coming that will address the lower end of this
market.

Thanks,

Kelly Lipp
CTO
STORServer, Inc.
485-B Elkton Drive
Colorado Springs, CO 80907
719-266-8777 x7105
www.storserver.com


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Alex Paschal
Sent: Friday, March 20, 2009 11:03 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] VTL and Dedup ( TS7569G)

Hi, Sabar.

I couldn't find a TS7569G via Google, but on the TS7650G, also a
deduping VTL, after data goes through the factoring (dedup) algorithm it
is run through a compression algorithm.  You probably won't see much
deduplication, but on the first backup you should see a decrease in size
similar to the decrease you would see from the compression on a tape
drive.

Regards,
Alex

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Sabar Martin Hasiholan Panggabean
Sent: Thursday, March 19, 2009 5:10 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] VTL and Dedup ( TS7569G)

Hi,


Does anyone here has been implementing or know how Dedup works in TSM
using TS7569G ? Let say I have 100 TB of data and backup to this VTL. On
the 1st attempt of backup / full backup, will this data size decrease on
the VTL

BR,

Martin P


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