Formulas:

You want your primary backup space to be large enough to write a "decent
sized filesystem" without having to start writing to your tapes.  There
was one guy on here who tossed forth his method of modifying his high
and low thresholds in the daytime (to 1 and 0, respectively) so that
when his backups started at night, they went like gangbusters because
his local storage pools were empty.
For secondary backup space, the formula is:

BackupSpace = (
AverageWorkstationSize)(NumberOfWorkstations)(%UtilizationOf
WorkstationDisk)(VersionsPerFileToKeep)

Unfortunately, with respect to the model number, there is no such info
to my knowledge.  In your situation, though, if the amount of disk is
substantial and your network isn't snail slow, I would assume your
limiting factor is going to be how fast your tape drive can write to
tape.

Regards,

Hilary Whitehead
IBM Global Services

> -----Original Message-----
> From: John Schuch [SMTP:John.Schuch AT ADVOCATEHEALTH DOT COM]
> Sent: Friday, July 24, 1998 9:12 AM
> 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