Re: [ADSM-L] VTL and Dedup ( TS7569G)

What Robert said.

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 
W. Curtis Preston
Sent: Saturday, March 21, 2009 11:24 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] VTL and Dedup ( TS7569G)

Funny.

I would say that BAD dedupe is the enemy of throughput.

There IS good dedupe.  I've seen it.  It hurts neither backup, nor restore
performance.

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Clark, Robert A
Sent: Friday, March 20, 2009 4:44 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] VTL and Dedup ( TS7569G)

Dedupe is an errand boy, sent by the storage industry, to collect a
bill.

Dedupe is the enemy of throughput.

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
W. Curtis Preston
Sent: Friday, March 20, 2009 4:25 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] VTL and Dedup ( TS7569G)

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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