I am upgrading from SDL Tridion 2013 SP1 HR1 to SLD Web 8.1.1 release within a clustered env.
Node 1 upgrade in Acceptance has been successful and is now considered "upgraded'.
Node 2 upgrade failed due to CMEnvID error below.
TRIDION_CM_ENVIRONMENT_ID="TCMDBUser_DB" WEBSITE_ROOT_URL="http://SERVER.DOMAIN.com:80" AUTHENTICATION_TYPE="Windows" CORE_SERVICE_ROOT_URL="net.tcp://localhost:2660" ADDLOCAL="FeatureTopologyManager"' [16F4:4EA4][2017-01-27T13:19:34]i000: Property 'CoreServiceRootUrl' of the item of type 'CmEnvironmentData' must be unique. Source of conflict: 'TCMDBUSER_DB'.
[5E50:17C4][2017-01-27T13:19:05]i301: Applying execute package: TopologyManager, action: Install, path: C:\ProgramData\Package Cache\{8F6A09B9-1190-4359-B3B4-2BC8FBC15663}v8.1.1312\TopologyManager.msi, arguments: ' ARPSYSTEMCOMPONENT="1" MSIFASTINSTALL="7" TRIDIONHOME="E:\Tridion" DB_SERVER="DBSERVER" DB_TYPE="Oracle" DB_NAME="Tridion_Topology" DB_INTEGRATED="False" DB_USER="TTMDUSER" DB_PASSWORD="*****" WEB_ID="5" WEB_DESCRIPTION="SDL Web Topology Manager" WEB_IP="(All Unassigned)" WEB_PORT="81" WEB_HEADER="" ROU_NAME="CMSERVERNODE2\Topology Manager Users" ROS_NAME="CMSERVERNODE2\Topology Manager Service Users" ADMINS_NAME="CMSERVERNODE2\Topology Manager Administrators" SYSTEM_ACCOUNT_NAME="MTSUSER" SYSTEM_ACCOUNT_DOMAIN="DOMAIN" SYSTEM_ACCOUNT_PASSWORD="*****" TRIDION_CM_ENVIRONMENT_ID="TCMDBUser_DB" WEBSITE_ROOT_URL="http://SERVER.DOMAIN.com:80" AUTHENTICATION_TYPE="Windows" CORE_SERVICE_ROOT_URL="net.tcp://localhost:2660" ADDLOCAL="FeatureTopologyManager"
[16F4:4EA4][2017-01-27T13:19:34]i000: Property 'CoreServiceRootUrl' of the item of type 'CmEnvironmentData' must be unique. Source of conflict: 'TCMDBUSER_DB'.
[16F4:4EA4][2017-01-27T13:19:34]i000: ExecuteError: e.UIHint=0
[16F4:4EA4][2017-01-27T13:19:34]i000: ExecuteError: ErrorCode=-2147483648
[16F4:4EA4][2017-01-27T13:19:34]i000: ValidateIis: prerequisite was detected: file 'InetMgr.exe' exists; sysnative=C:\Windows\Sysnative
[16F4:4EA4][2017-01-27T13:19:53]i000: ExecuteError: user's action: Ok
[5E50:17C4][2017-01-27T13:20:18]e000: Error 0x80070643: Failed to install MSI package.
[5E50:17C4][2017-01-27T13:20:18]e000: Error 0x80070643: Failed to execute MSI package.
[16F4:4EA4][2017-01-27T13:20:18]e000: Error 0x80070643: Failed to configure per-machine MSI package.
[16F4:4EA4][2017-01-27T13:20:18]i319: Applied execute package: TopologyManager, result: 0x80070643, restart: None
[16F4:4EA4][2017-01-27T13:20:18]e000: Error 0x80070643: Failed to execute MSI package.