You'll need to gather the following info:
1. The number of files and database servers to backup
2. How much data is on your client machines
3. What data will you be backing up
4. How many versions will you be keeping
5. What percentage of data changes on a daily basis

There are additional formulas to use to calculate the ADSM db and storage
pool sizes:
Estimating Tape Pool
one backup version + (number of daily incoming X (number of versions over
time -1) X space for reclamation

Estimating ADSM intermediate disk storage
number of clients X amount of backup data

Estimating Size of ADSM database
files per client X number of clients X 500 bytes

As for performance, estimate how many GB's/hour you'll need to push through
your system based on the business requirements then work on sizing your
hardware.  Remember, your first bottle neck will be most likely Tape
subsystem I/O.  Network and CPU speeds are also very important factors.
Also, keep in mind your DR requirements. (i.e. Can you restore your 20+
systems using just 2 DLT tape drives, in an exceptable amount of time?)

Keenan D. Stratton
Technical Analyst
ISI, Mars Inc.
E-mail: Keenan AT Webname DOT com

> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
> John Schuch
> Sent: Friday, July 24, 1998 12:12 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: RS6000 SERVER HARDWARE
>
>
>    We are currently running ADSM Server Version 3.1.1.3 on
>    an RS6000 7013-570 that has 320MB of memory and 44GB of
>    SSA disk (7133-600).  Our OS is AIX 4.2.1.0.  We are
>    using an OVERLAND tape library robotics setup consisting
>    of LXG2016, LXB2210 and LXC2016 components.  This
>    provides us with robotics, 42 slots and 2 DLT2000XT tape
>    drives. This server is currently backing up 5 Sun Solaris
>    clients which have a combined data size of around 80GB.
>    Our ADSM database is allocated at 1GB and its current
>    utilization stays around 60%.  There wasn't a whole lot
>    of thought put into sizing a processor for this setup
>    because we just used the equipment that we had on hand.
>    Nevertheless this setup seems to work very well.
>
>    We are looking at using this machine to backup 10 to 15
>    additional Netware clients which have a combined data
>    size of around 100GB.
>
>    Additionally, we are considering implementing ADSM
>    Servers at 2 other company locations which will have a
>    client load quite similar to the above mention
>    configuration.
>
>    My questions are...
>
>    How does one size an RS6000 to be used as an ADSM server?
>    Are there any formulas or rules of thumb that say if you
>    have "x" number of clients with "y" amount of data you
>    will need "z" model RS6000 server?
>
>    Any thoughts or comments would be most welcomed.
>
>    John
>