Jeff, Thank you for giving your experience with HA AIX and a cluster. We are also doing the HA but not clustering. The couple minutes time lag you mention and the possibility of broken transactions make one wonder if it's worth going that distance.
I didn't know Stratus was still out there so thanks for that. What about Sequoia? That was also a very coveted system in the 911 offices back in the day. Awesome story about the Sequoia still tooling right along while the disk is on fire. So did the system switch itself over to 'B' or did y'all do it, when? I can't match that one, but even with Reality 7 (sorry to mention this on the U2 list) we could throw a manual switch (took me about 30 seconds to get from my office to the switch in the computer room) and when the dispatchers logged in, there were their sessions with screens looking identical to system A. That's why I gotta believe we can do better, 20 years later. Thank you. -Baker -----Original Message----- From: u2-users-boun...@listserver.u2ug.org [mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Jeff Schasny Sent: Monday, July 26, 2010 10:24 AM To: U2 Users List Subject: Re: [U2] 24 X 7 MV systems 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 > > > > ________________________________ > This communication, its contents and any file attachments transmitted with it > are intended solely for the addressee(s) and may contain confidential > proprietary information. > Access by any other party without the express written permission of the > sender is STRICTLY PROHIBITED. > If you have received this communication in error you may not copy, distribute > or use the contents, attachments or information in any way. Please destroy it > and contact the sender. > _______________________________________________ > U2-Users mailing list > U2-Users@listserver.u2ug.org > http://listserver.u2ug.org/mailman/listinfo/u2-users > > -- ------------------------------------------------------------------------ Jeff Schasny - Denver, Co, USA jschasny at gmail dot com ------------------------------------------------------------------------ _______________________________________________ U2-Users mailing list U2-Users@listserver.u2ug.org http://listserver.u2ug.org/mailman/listinfo/u2-users _______________________________________________ U2-Users mailing list U2-Users@listserver.u2ug.org http://listserver.u2ug.org/mailman/listinfo/u2-users
