I don't believe you are correct. 390 I/O rates are generally orders of
magnitude larger than UNIX as there is simply much more I/O being
performed. Personally, having experience on both, I find 390 much easier to
administer, and the security is much more robust. And I don't work for IBM
either. 390 processor utilization is a product of the workload, and
adjustable via tuning. If your ADSM environment was not being dispatched
properly, then either you had a mistuned 390 system or an undersized
processor, or both. 390 is indeed a transaction processor par excellence,
but is no slouch in the I/O area, but it is indeed "optimized" for this
environment, as DB2 and CICS would not transact very well if it was not.
UNIX may be better at interactive applications, but I don't think it is
better at I/O, transaction, or batch processing. And a 390 is infinitely
more scaleable, and now can run Linux anyway. And one 390 box can replace a
whole bunch of small UNIX servers.
Just my $.02

Doug


At 02:18 PM 3/20/2002 +0100, you wrote:

Hi

As far as I can see, moving do a UNIX platform only has positive effects
such as:

- Higher throughput. Normally, the S/390 guys only allows a minor amount of
memory and processor utilization to be used by ADSM/TSM. This is not a
problem when running a UNIX box.

- The UNIX boxes normally have higher disk and tape I/O than a S/390
system. Dont ask me why, but I have seen this in environments where TSM had
existed on both UNIX and S/390.

- Administration of a UNIX box is normally easier, and you don't have to
have a IBM representative doing all the work.

- S/390 is optimized for transactions, UNIX is optimized for
disk/tape/network I/O.

Best Regards

Daniel Sparrman

snip>>>>>>>>>>>>>>>>>..
Doug Fuerst
Consultant
BK Associates
Brooklyn, NY
(718) 921-2620
doug AT bkassociates DOT net