Julie,
        From our experience, the processor speed has been the biggest
bottleneck.  When things get really busy, we find TCPIP is running at
about 35-40% CPU while ADSM is at close to 100% - this is on a 3090-500J
(21 MIPS per engine) so I think a faster processor will do better.
Right now we're running flat out with ADSM at night and, many mornings
when I come in there are 5-10 incremental backups still running.  As
background info, we have about 120 clients, mostly Netware, NT, and Unix
servers, and back up about 22-25 GB per night.  The database is about 8
GB (mirrored), the recovery log is 3 GB (mirrored) and ADSM is keeping
track of about 900 GB of data in the various storage pools.  The
database and recovery logs are isolated on their own disk volumes - I
suspect we might be running into bottlenexks with the database also but
haven't had the time to pursue this.  In fact, we are running 2 ADSM
servers on our MVS/ESA system - one is a 'miniature' (if you can call a
4.5 GB database miniature :-)  exclusively used for offsite backups.
The one thing to keep in mind when creating multiple ADSM servers is
that it is a CPU hog so only split it up if you can afford the CPU
cycles.

Tim Pittson
tpittson AT himail.hcc DOT com

>----------
>From:  Julie Phinney[SMTP:julphinn AT EMPHESYS.E-MAIL DOT COM]
>Sent:  Thursday, June 27, 1996 2:37 PM
>To:    Multiple recipients of list ADSM-L
>Subject:       Multiple MVS servers?
>
>I am running 200 clients to an ADSM-MVS server.  It amounts to about
>140 GB backed up and about 7 GB per night.  The database is 2 GB.
>Our clients communicate via LU6.2 since the ADSM mainframe does not
>have TCP/IP on it. We have another mainframe that does have TCP/IP
>on it, but no ADSM.  We are getting ready to start backing up Windows
>95 clients (which require TCP/IP) and MANY more file servers.  So I
>will probably either put TCP/IP on the ADSM mainframe, or move ADSM
>to the other mainframe.  WHAT I WAS WONDERING:  Perhaps I should have
>ADSM on both mainframes, and have 2 ADSM servers.  Does anyone have
>any guidelines as to what point it makes sense to have 2 ADSM servers?
>For ex., how many nodes, what size of database?  Both mainframes are
>ES9000 9X2 models.  We don't need 2 now, but I wonder at what point
>we will.  Having 2 ADSM servers would save me either paying for TCP/IP
>one the ADSM machine or transferring the existing 200 clients to the
>other mainframe.  Any suggestions?
>