On a bus and tag connection on a mainframe the max thruput is 4.5 mb and
that is usually only attainable by high speed disk on the mainframe.
Considering the type of device that the RS/6000 is genned at (CTCA).  You
should be glab you are getting what you are.  IF you want faster spend
$12000 and get an ESCON card.

At 11:09 AM 6/10/96 -0500, you wrote:
>
>     Kevin,
>
>
>
>         We have an RS/9000 model 990 which is channel (bus + tag) attached
>     to our MVS system. I am not familiar with the MVS details (I'm
>     primarily a UNIX hack) but our users claim "BEST" FTP transfer rates
>     of 2.5 - 3 MBYTES/sec over the B&T interface. So your rates with ADSM
>     over fiber seem very slow. This may be due to ADSM overhead and/or
>     possibly overworked systems on either side. Try FTP'ing a large file,
>     see what you get for throughput and go from there. If your FTP
>     throughput is significantly better than ADSM blame ADSM. As another
>     side note... my understanding is the TCP/IP implementation on a MVS
>     system is much slower than UNIX (even Mainframe software vendors
>     selling network backup products admit this). Expect MVS TCP/IP to
>     max-out at 2 or 3 MBytes/sec regardless of your network topology. This
>     issue, I have been told, has to do with the way TCP/IP runs as a task
>     on MVS whereas UNIX has a kernel-level IP implementation.
>
>
>     Tom Mcknerney
>
>
>______________________________ Reply Separator
_________________________________
>Subject:      Transfer rate from RS/6000 to MVS
>Author:  PC:Kevin.Brown AT BCBSKS DOT COM at INTERNET
>Date:    6/7/96 3:16 PM
>
>
>Recently we obtained an RS/6000 with an ESCON card. We are planning on using
> this card to backup the RS/6000 to our host using ADSM and TCP/IP. Does
>anyone have experience with this kind of setup? We ran a preliminary FTP from
>the host to the RS/6000 which transfered 17 MB in 34 seconds. This seems slow
>to us. Should an ADSM backup be faster? Hardware and software are as follow:
>
> Host:   IBM 9672-R83 running MVS/ESA 4.3, DFSMS 1.2, TCP/IP 3.1, ADSM 2.1
> Client: RS/6000-J30 running AIX 4.1.4, ADSM 2.1
>
>Any info would be appreciated.
>
>********************************************************************
>
>Kevin Brown StorAdmin
>Blue Cross/Blue Shield of KS.
>Kevin.Brown AT BCBSKS DOT COM
>
>