*** Original Author:  ADSM-L @ MARIST - ** Remote User **; 06/11/97 03:25pm

>Date:         Wed, 11 Jun 1997 15:02:30 -0600
>Reply-To:     "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
>Sender:       "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
>From:         Tony Pietrusiewicz <PIETRUSIEWICZT AT BCBSIL DOT COM>
>Subject:      MVS Server with OSA2 Adapter on CMOSS Processor
>To:           ADSM-L AT VM.MARIST DOT EDU
>
Hello All,
      I'm currently running on an MVS Server using TCP/IP with a 3172
Controller and ICP. We have a CMOSS processor on order.
      Would ADSM performance improve using an OSA2 adapter on the
CMOSS processor?
      Another alternative would be to use a CISCO router. Does anyone
know the pros and cons?
      Your comments please.

Tony Pietrusiewicz
Blue Cross Blue Shield of Illinois
phone # 312-946-5205
fax # 847-473-1446

*** Comments From: STEWAJM - Stewart, Mike; 06/11/97 04:13pm


We have a CMOS machine and run ADSM/MVS, TCP/IP clients.

We have both an OSA(1) and a 3172 (model 3, w/486 processor).


We recently spent a few hours one Sunday morning swapping
between the two and testing performance.

The first environment we tested was:

  cmos--3172-3  --- tr --- pc
Compared to:
  cmos(osa1)    --- tr --- pc

Moving to the OSA1 produced a 27% reduction in data transfer time.

The second environment we tested was:

  cmos--3172-3 --- tr --- cisco -- ethernet -- pc
compared to:
  cmos(osa1)   --- tr --- cisco -- ethernet -- pc

Moving to the OSA1 produced a 66% increase in data transfer time.

These numbers represent the best we could do with various
settings of TCP packetsize/buffersize.

Because most of our traffic is ethernet routed to the token ring
we decided to use the 3172-3 for our primary IP traffic.

Note, I don't present this as an exhaustive test, just what we
came up with in a few hours testing, playing with the settings
we had easy access to.  There could easily be other knobs to
tweak in the routers that could make a difference.