• Subject: Re: Access backup system
  • From: Richard Grenham <rgrenham@xxxxxxxxxxxxxxxx>
  • Date: Fri, 01 May 1998 16:45:09 -0400
  • Organization: Grenham Computer Services

Charlie;
I attended a session at COMMON about the AS400 Web site and if I remember
correctly, this is the concept that they use when they are updating or backing 
up
their primary server. The presenters were Jim Powell and Mike Ewen from
Rochester. Sorry, don't have e-mail or phone numbers.

Charles L. Massoglia wrote:

> We have a situation where remote users access the main AS/400 over frame
> relay with PCs using ethernet and dumb terminals attached to a 5494 which
> also uses ethernet.  If the main system is unavailable, we want to redirect
> the PCs and dumb terminals WITHOUT ANY CHANGES TO THE PCs OR THE 5494 to
> another backup AS/400 in a different physical location.  We do not want our
> users to have to select a system.  It should be transparent.  In addition,
> once the main system is back up, we need the backup system to communicate
> with the main system while the users are still connected to the backup
> system.  Upon completion of updates, we want to disconnect the users from
> the backup system and have them reattach to the main system.
>
> We have been told this can be done by having 2 ethernet cards in both
> systems with identical IP addresses, i.e. primary card A on main system with
> same IP address as alternate card B on backup system and alternate card B on
> main system with same IP address as primary card A on backup system.  Card B
> always varied off until primary machine is down.  PCs and 5494 use
> communicate to main system using primary IP address and alternate host name.
> When main system goes down, alternate card B on backup system varied on and
> same alternate host name added to backup system, permitting PCs and 5495 to
> use same IP address and host name to access backup system as they used to
> access main system.
>
> Does any of this make sense?  Is anyone doing this?  Any help would be very
> much appreciated.
>
> Thanks.
>
> Charlie Massoglia, Massoglia Technical Consulting, Inc.
> PO Box 1065, Okemos, MI 48854, USA
> 517-676-9700  Fax: 517-676-1006  EMAIL: cmassoglia@voyager.net
>
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