We are running an IBM high availability cluster of AIX machines which do
auto fail-over. There is a couple minutes of time lag involved and there
can be broken transactions since the switchover is OS level and not
applications based so this is probably not a good solution for you since
it sounds like you are looking for a truly fault tolerant solution.
Stratus is still out there and probably a good choice for your needs. I
know they have at least one series of boxes which run Red Hat and
therefore are U2 compatible.
I worked on a fault tolerant Sequoia system running Pick OA many years
ago supporting an alarm monitoring application. Amazing machines. True
Story: The operations manager gets a call from the computer operator who
tells him "Theres smoke coming out of one of the disk drawers on the
Sequoia 'A' system" (we had a second redundant Sequoia 'B' system as
well). A couple quick phone calls later 5 of us are huddled together in
the computer room on various phones with Sequoia after hitting the raid
disk drawer in question with a fire extinguisher, trying to decide if we
should switch over to the backup system, when out of the little glass
cubicle where the operators live comes the operator on duty. He walks up
to the smoking system, pulls off a spinning magnetic tape, and mounts
the next reel of a file restore he's doing for someone. We all look at
each other and laugh because the system is still running along just fine
while on fire.
Baker Hughes wrote:
Hey y'all,
I'm interested in hearing from folks who are currently on, or have worked with
fault tolerant MV systems.
We'd like to host our Business Layer on the MV system and serve It to our
e-commerce portals, instead of re-coding our business rules first in Basic,
then in .Net In order to get there though we must meet the primary business
requirement of zero downtime (not even 2 minutes to manually switch). We're
not talking about different levels of Raid - it's assumed the storage array is
up and available. If the MV system has a hiccup of more than a few seconds it
needs to hot failover to a backup twin sister.
Is anyone doing this or something close to it? When I worked in public safety,
Stratus sold such an automatic hot failover. I'm sure the EnRoute folks are
doing something like this still. Maybe Nick G. or Margaret M. is listening in
today.
Thanks,
-Baker
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Jeff Schasny - Denver, Co, USA
jschasny at gmail dot com
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