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Chapter 3 • System Components 2. The second method is without the use of Areserve HA. In this configuration, all Disaster Mobile server configuration files are configured to launch against the Disaster Recovery Inform CAD server. There is no manual failover process nor are changes performed on the Production Mobile server being sent to the Disaster Recovery Mobile server. As a result, any changes to the Production Mobile server such as adding additional devices, modifying HTML files, or changing Mobile database settings have to manually be performed against the Disaster Recovery Mobile Server. 13.3 HOT STANDBY/DISASTER SERVER BEST PRACTICES The Hot Standby/Disaster Server data may not be actively utilized for reporting purposes (like a Reporting Server) when it is in the Target mode. Additionally, replication may need to be restarted after each server failover. The system has been tested through both LAN and WAN connections. The network connectivity for LAN or WAN should be 100Mbps or greater. TriTech has identified some challenges related to customer use of Areserve for Disaster/Hot Standby Server functionality. These best practices have been developed to prevent problems with this system. Recommended Actions: 1. Always perform synchronization prior to failing back to the production database server. 2. Do not failover to your Hot Standby Server in order to do database maintenance. Areserve works by copying data from the disk level. Changes made to your offline database — including reindexing or database defrag — will be overwritten when you resynchronize your servers. 3. If you have problems with a failover or a Tailback, please contact Technical Services, including after hours. Do not attempt to failback and forth between servers if you have a problem as you may damage your most current database if you have missed a step or had an interruption in the process. 4. Always contact Technical Services before elective failovers. This will allow for the designation of a configuration engineer in advance to support you if a problem is experienced. 5. For elective failovers, have users exit CAD and stop interfaces before the cutover. 6. Follow the Areserve maintenance document before you apply Microsoft updates, SQL service pack, or hot fixes. The contents of this material are confidential and proprietary to TriTech Software Systems, Inc. and may not be reproduced, published or disclosed to others without the prior written consent of TriTech Software Systems, Inc. ©2015 TriTech Software Systems