ADSM-L

Re: SUBFILE BACKUPS FOR LAPTOPS

2002-03-18 10:52:27
Subject: Re: SUBFILE BACKUPS FOR LAPTOPS
From: "Prather, Wanda" <Wanda.Prather AT JHUAPL DOT EDU>
Date: Mon, 18 Mar 2002 10:49:52 -0500
Yep, that is what subfile backup was designed for - reduces the amount of
data to be sent over the network for backup, on the assumption that laptops
are usually using a slow link.  (Although I have found there are cases where
subfile backups work great for desktops of all kinds, not just laptops.  And
we have done backups of remote clients over slow links WITHOUT subfile
turned on.  Just depends whichever works best for you.)

There is a white paper on the Tivoli web site that explains how to
implement:
http://www.tivoli.com/products/solutions/storage/storage_related.html#white
Pick the .pdf file titled "Adaptive Subfile Differencing".

It's pretty simple, just a couple of parms to set in the dsm.opt file (or a
client option set on the server).

We are running 400 Win2K clients using the 4.2.0 client, with subfile turned
on for all files on the drive.
Have never had a problem with it, and have successfully done several real
bare-metal restores.
(Have never tested subfile with a 4.1.x client).

Only gotcha is that you may want to think twice if you are NOT using
collocation.  With subfile turned on, for every file you want to restore you
have to restore 2 files:  the base file and the delta file.  If you are
using collocation you won't notice; if you aren't using collocation that
means 2 tape mounts instead of 1.

Hope that gets you started..
************************************************************************
Wanda Prather
The Johns Hopkins Applied Physics Lab
443-778-8769
wanda_prather AT jhuapl DOT edu

"Intelligence has much less practical application than you'd think" -
Scott Adams/Dilbert
************************************************************************










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