Don't forget that you are not supposed to backup your client while creating
the backupset.
This limits their usefulness IMO
>>> jpohlman AT CA.IBM DOT COM 14/02/2003 12:37:05 >>>
Graham, an estimate is the sum of (capacity * percent utilized) for the
filespaces for a given client if you are including all filespaces in your
GENERATE BACKUPSET. Realize that if you are using a tape device class, the
minimum amount of media is one tape cartridge per backupset. So, for small
clients, you may have a low utilization for backupset tapes. In your case,
you will have a minimum of 700 tapes for the backupsets. You may want to
consider a non-tape device class, such as a server device class if you
have multiple TSM servers, or even setting up a virtual volume environment
on a single TSM server as backupsets are then archive objects (that is
virtual volumes) that can co-reside on a physical tape. The amount of
space is then the sum of capacity * percent utilized for all 700 clients
in MB - you can then take the capacity of the tape media to calculate the
actual amount of space required. Use the capacity you achieved for full
tapes as a realistic capacity.
Joerg Pohlmann
604-535-0452
Graham Trigge <Graham_Trigge AT ENTERPRISESERVICES.COM DOT AU>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
2003-02-13 14:35
Please respond to "ADSM: Dist Stor Manager"
To: ADSM-L AT VM.MARIST DOT EDU
cc:
Subject: Estimating size of backup sets
TSMers,
Is there anyway people know of to estimate how large a backupset is going
to be? I have close to 700 nodes I want to generate backupsets for and I
want to know
what sort of space I will be using up with them. I am assuming it will be
some sort of SQL statement looking at active files, but I can't figure it
out past that.
Any help would be appreciated.
Regards,
------------------------------------------------------------------------------
Graham Trigge
IT Technical Specialist
Server Support
Telstra Australia
Phone: (02) 9882 5831
Fax: (02) 9882 5993
Mobile: 0409 654 434
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