Glen, Thank you for the good observations, and suggestion to ping Ross, which I will do. It is the MV db paradigm which in this case is hampering us, which drives the solution to either the OS level or some middle ware solution. Pausing the db to flush memory is what keeps us just seconds from a full solution.
Thank you. -Baker -----Original Message----- From: u2-users-boun...@listserver.u2ug.org [mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Glen Batchelor Sent: Monday, July 26, 2010 10:03 AM To: 'U2 Users List' Subject: Re: [U2] 24 X 7 MV systems Hey Stranger, The best way you'll get there is with a transaction/request based redundancy setup. Does U2 have anything that isn't trigger related? Even a block-level DRDB config won't help with databases since transactions in memory aren't committed to disk promptly enough for the replicator to get all of the new data pieces as the fault happens. I've been looking for a remote hosted failover solution myself (not for U2). A truly fault tolerant setup requires that the incoming requests be replicated to multiple machines before anything happens inside. You might think of the user app as a web service consumer that makes requests to a proxy. That proxy mux's the requests to multiple machines, compares all of the responses and then passes back the response of one machine based on failover priority. If one of the responses aren't the same then an error is sent to the admin. Unfortunately, this spits in the eye of MV which is designed to be a stand-alone central data store. Maybe you can do it with your own TCP packets, but if you don't use an encrypted media you may get into security trouble. Web services are horribly bloated, but the security layer is already in there. You should bug Ross Ferris and pick his brain about his DRS product versus other options for U2. DRS supposedly uses a small amount of bandwidth but it isn't encrypted AFAIK. Regards, ---------------------------------------- Glen Batchelor IT Director/CIO/CTO All-Spec Industries phone: (910) 332-0424 fax: (910) 763-5664 E-mail: webmas...@all-spec.com Web: http://www.all-spec.com Blog: http://blog.all-spec.com ---------------------------------------- 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
