Steve, we perform weekly full backups and nightly incremental backups to tape 
(LTO5). We are using version 6.4 of the baclient and TSM for VE, which allows 
incremental forever--we do not use that option. The highest daily change I see 
during the nightly incremental backups is about 25%. The average is around 
8-10%.

Ray Storer
NIBCO INC.


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Steven Harris
Sent: Wednesday, May 15, 2013 5:20 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] TSM for VE sizing vs standard incremental forever

Hi All

I've been asked to do some ballpark sizing for a major rework of a TSM 
environment. Clients are linux and Windows under Vmware

This customer has been using standard BA client backups up until now, ie 
incremental forever, and the new env will be TSM for VE with the backend being 
tape rather than disk so no dedup possible.

Given that TSM for VE uses some funky differential backup technology on the 
changed blocks, how much data does your typical VE installation backup per day 
per protected TB?  Anyone with real world data out there?  Sorry it is such an 
open question but anything you can give me is better than a stab inthe dark.

Regards

Steve

Steven Harris
TSM Admin
Canberra Australia


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