OS/390 2.5 TCP/IP 3.4 - same as you it would appear. What sort of
filesystems are your clients? If they typically contain a lot of large files
then this would explain the peformance increase you're experiencing compared
to ours.

It's also possible that we are being limited by our Escon controller, I
found out the other day that over the weekend our Escon Channel reached 89%
utilisation - 70% on an Escon Channel is a very high utilisation. This maybe
another bottleneck in our configuration.


Nahtan
        -----Original Message-----
        From:   Sam Sheppard [SMTP:SHS AT SDDPC.SANNET DOT GOV]
        Sent:   Tuesday, March 02, 1999 10:11 AM
        To:     ADSM-L AT VM.MARIST DOT EDU
        Subject:        Re: MVS ADSM Server

        ---------------------------- Top of message
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        >>--> 03-02-99  08:02  S.SHEPPARD     (SHS)    Re: MVS ADSM Server
        >>--> 03-02-99  08:02  S.SHEPPARD     (SHS)    Re: MVS ADSM Server

        I would be curious to know what levels of MVS or OS/390 you are
running.
        We are getting 2-3+G/hr over FDDI when running OS/390 2.5 (the
rewritten
        TCPIP stack). If you are running anything below this, your
performance
        will not be that good.  We backup 200+ clients a night with 60-70G
        transferred and are not seeing any big problems.
        Sam Sheppard
        San Diego Data Processing Corp.
        shs AT sddpc.sannet DOT gov

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        >>--> 03-02-99  06:00  ..NETMAIL     ()     Re: MVS ADSM Server
        >>--> 03-02-99  06:00  ..NETMAIL     ()     Re: MVS ADSM Server
        Date: Tue, 2 Mar 1999 07:46:33 -0600
        From: "Nathan King" <nathan.king AT USAA DOT COM>
        Subject: Re: MVS ADSM Server

_________________________________Top_of_Message_____________________________
____

        We're also in this scenario. ADSM MVS (Open Edition) with ATM
backbone and
        again rarely see over 1.5 - 2Gb/hr on backups, the only exception is
in the
        case of large flat files such as database dumps where we have seen
it go as
        high as 4Gb an hour! wow! We have a very small Risc/6000 server
        (Uniprocessor w/512Mbyte Ram) on the same ATM backbone which peforms
about 6
        times better!!!

        We know that there are defnitely a lot of issues with TCP/IP
performance on
        MVS. We backup over 1,000 clients each night to 5 ADSM Servers
spread
        throughout the sysplex and frequently get lost client tcp/ip
sessions during
        the course of the night and generally poor performance. TCP/IP on
MVS just
        plain stinks. I've lost count of the fixtests, ptfs and hipers that
have
        been applied to both TCP/IP and ADSM in an attempt to get around
these
        problems. IBM really seem to be chasing their own tail on this one
and I
        don't expect TCP/IP on MVS to improve for some time.

        One thing we did do which helped a lot was reserving the appropriate
tcp/ip
        sockets on MVS for use exclusively by ADSM. This did provide a lot
more
        stability. Perhaps you've been smart enough to do this already. The
even
        smarter thing to do would be to migrate off MVS to AIX / NT.

        Regards,

        Nathan


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