RE: Twinax, IP and 5250 emulation.. -- MIDRANGE-L

If they go to LAN and blow away the twinax can use a virtual IP address that
a router would send to one of the systems.  That way is one system fails,
the router switches the traffic to the other system.  The two AS400s have
unique IP address and can communicate using them.  You can also reach the
AS400s with there unique IP which would be useful for administration
purposes.  You just have to have a powerful enough router to handle the
traffic.  We use this for people coming in through the internet.  They never
know, or care, what system they are really attached to.  For local users
using CA, they will have to restart their connection in case the primary
system fails.  I don't know all the details for setting up or
hardware/software required but a good network administrator can do that
part.  Good Luck,


Christopher K. Bipes            mailto:ChrisB@Cross-Check.com
Sr. Programmer/Analyst          mailto:Chris_Bipes@Yahoo.com
CrossCheck, Inc.                http://www.cross-check.com
6119 State Farm Drive           Phone: 707 586-0551 x 1102
Rohnert Park  CA  94928         Fax: 707 586-1884



-----Original Message-----
From: Jeffrey Silberberg [mailto:jsilberberg@mindspring.com]
Sent: Thursday, June 24, 1999 10:14 AM
To: MIDRANGE-L@midrange.com
Subject: Twinax, IP and 5250 emulation..



Hey All,

            Have a client with two AS/400 systems tied together in a
redundant configuration with Mimix and LAN's and all the good stuff.
Currently on V3R7 getting ready to do to V4R[3/4]..

            As part of this configuration they have about 15 workstations on
Twinax and a BIG switch that moves the entire operation center from the B
Twinax controller on system-A to the B Twinax Controller on system-B.  Now,
the issue is that it is getting hard to find Twinax emulation support that
does all of the newer functions, so they are looking at IP options, but I
was first wondering what people are using today for this more traditional
configuration on high speed PCI bus Win/[98/NT] workstations.  Synapse,
Netsoft, Full CA/400, Other ??  and what PCI bus adapters out there are ROCK
SOLID ??

            Second, with IP on Twinax available, has anyone used this in a
failover environment where the SWITCH is thrown and the workstations just
reconnect to the B system.   I would assume that both the A and B systems
would have the same IP address, and that the fail over CLP control process
would just bring the interface online/offline.  But what about route entries
?  Can the same IP address be quote active on both systems with the new
HACMP support as long as the actual workstations in the subnet can only get
to one of the controllers. AKA the BIG switch.

            Third, with LPAR and HACMP functions in 4.4 what are the rules /
constraints for IP address definition and failover ? Are they documented
some where, or better yet has anyone installed and tested such a
configuration ?

            TIA,
            Jeff Silberberg..
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