Brad and John, [ad] Since, we work with both UD and UV we found replication is not the same. We wrote a simple Java program that runs using UOJ and does the replication to one or many sites. The software can even replicate from Universe to Unidata or the other way. Additionally, we added support for TCL/ECL commands such as CREATE.FILE, BASIC, and most others. We don't have any problems with any release of Unidata 6.0 or greater or Universe 9.6 or greater. We don't have any issues with dynamic or hashed files since everything is replicated at the record level.
This is all part of our amazing U2WebLink(tm) product that runs on Apache Tomcat. We even added native support for PHP. The product handles thousand upon thousand of transactions per hour without even a hiccup at our clients for many many years. [/ad] Regards, Doug www.u2logic.com/tools.html BTW: We heard that soon UD and UV will be using the same replication engine. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of John Hester Sent: Tuesday, December 15, 2009 11:01 PM To: U2 Users List Subject: Re: [U2] Unidata 6.1 Replication Brad is right. You can get bitten by OS-level replication with U2 because hashed files require more than one write when a record has to go to overflow space. If the primary box crashes when only one of these writes is done, the secondary box will have a corrupted file. There are also issues with UV dynamic files (don't know about UD) because some of the file structure information is cached in memory and not immediately flushed to disk. We do OS-level replication on UV and got around these issues by sizing all files to use no overflow and only using dynamic files for temp report work files. -John _______________________________________________ U2-Users mailing list [email protected] http://listserver.u2ug.org/mailman/listinfo/u2-users
