* What will happens when someone delete the tsm_cache folder without
knowing it? Inside this folder threr are the basefile, the metafile and
the
client_cache_dbfilE
>> I tried this myself, it does no harm. The next backup will create
a new basefile instead of a subfile, that's all. Doesn't affect
restores. .
* Is the option to use the adaptive subfilebackup more burden for The
TSM-Server ? More datavolumes to work with for the server.
>> In terms of performance/throughput it has actually REDUCED the
workload on our server. I am using subfile backup on all files for about
350 desktops. It has reduced the GB per day by 20-25%. Because the clients
send less data, the client sessions are shorter. Resulting in fewer
concurrent sessions, so server is less busy.
>> However, it appears to increase the amount of EXPIRE INVENTORY
objects. But that runs mostly on the weekend, so it doesn't cause me any
problem.
>> Consider also what happens if you need to restore a file: you must
restore a base file PLUS the subfiles to get the most current version. You
will see this on the client, it says "2 objects restored" (or more!) when
you restore 1 file! So consider what it will do to your restores. We use
VERY fast tape (STK9840) with collocation, so it doesn't hurt our restore
times.
* Is a normaly Fullbackup, manually started the same as the server
does when a new basefile will be created?
Does the creation of a new basefile include the cheking of changed
datas, or does it just overwrite all spaces.
>> Sorry, I'm not sure what you are asking.
* When I use this kind of backup with more generations, will be placed
for every new generation a new basefile,
or does realy just the adaptives got newer (so I can use more
generations with less datavolumes) and only just one basefile?
>> Version1 is the base file. Version 2 (when the file changes) sends
just the part of the file that changed. Version 3 (when the file changes
again) sends just the part of the file that changed. Same logical versions,
less data sent to the server.
Simple example:
Suppose you have a 200 MB file; only 10 MB changes each day.
Without subfile backup: 5 versions take up 1 GB on the server.
With subfile backup: version1 (base file) takes up 200 MB, next 4
incrementals take up 40 MB, total 240 MB on the server.
Hope that helps!
************************************************************************
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
************************************************************************
E-Mail: mailto:wolf-christian.luecke AT volkswagen DOT de
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