Since we write software for 911 systems it is critical for our application to be able to be switched from one system to another. We use Unidata and have written a subroutine that gets called for every write and delete it creates transactions that are sequential and all of our 1000 programs call the same routine. We then use NFA to access the backup system and we have a phantom process that reads each transaction from the primary and writes it to the backup we also use secondary NIC cards to ensure speed. This works very well and the backup is always within a couple of seconds of the primary. (we also do this with 3 and 4 systems together). Anyway you can stop the phantom and do maintenance on the backup then restart the phantom and all the transactions catch up.
The only down side is that you have to log out and back on. We have separate icons so end users can either be on the primary or backup and we also have flags set so someone doesn't log into the backup by mistake. Unidata also has data replication which I hear good things about but we have never taken the time to try to decide if it would be worth it to switch to it. Any interfaces that you might have that are serial we connect to a network terminal server and all we have to do is stop and start the interfaces from the backup and everything works. Nicholas M Gettino | Director of Development | EnRoute Emergency Systems, an Infor company | office: 813-207-6998 | fax: 678-393-5389 [email protected] | www.enroute911.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jeff Powell Sent: Wednesday, March 18, 2009 3:07 PM To: [email protected] Subject: [U2] Does anybody have a hot backup server? I am trying to put together a backup strategy that involves keeping a standby server within two data hours of the primary. The idea is to be able to have users log into the backup server and keep the business running in the event of a crash. I'd like to hear what solutions others have found for this. I've been trying to contact IBM for the last 6 months but they haven't answered and my ERP vendor doesn't know how to do this. Any ideas are appreciated. TIA ------- u2-users mailing list [email protected] To unsubscribe please visit http://listserver.u2ug.org/ ------- u2-users mailing list [email protected] To unsubscribe please visit http://listserver.u2ug.org/
