FCO CI750-1007, The CIXCD requires LO118 or L0100 Min Rev E.

This Field Change Order (FCO CI750-1007) outlines a mandatory upgrade for VAXcluster systems using a CIXCD, specifically for 9XXX or 65XX systems, or when upgrading existing clusters with CI750, CI780, CIBCI, HSC50/70 nodes. The primary issue is that the CIXCD option requires CI-LINK modules to be L0118 or L0100 Minimum Revision E; L0100 Rev D modules are incompatible, particularly in large clusters (over 16 nodes) or those containing HSC60/90. Operating with a mix of "7-TICK-MODE" and "10-TICK-MODE" CI-LINK modules will severely degrade CI-arbitration performance and increase collision rates, posing significant risks to data integrity.

The FCO mandates replacing all L0100 Rev D modules with L0118-** or L0100 Rev E modules. The installation procedure involves:

1. Initially setting up and testing the new modules in "7-TICK COMPATIBLE" mode under VMS.
2. A critical full cluster shutdown is required to safely transition all CI/HSC nodes simultaneously to "10-TICK INCOMPATIBLE, ECO-ENABLED MODE." This step is essential to prevent CI-path failures, cluster member loss, and data integrity risks, as rolling upgrades are not supported for this mode change.
3. Adjusting specific jumpers and DIP switches on L0100-E1, L0100-E2, L0118, and CIBCA backplane modules according to the cluster size and desired tick mode (7-TICK or 10-TICK).
4. Running diagnostics and rebooting the cluster.

The document provides detailed instructions for switch/jumper settings, lists required tools and parts (primarily L0118-** link modules), and stresses the importance of customer involvement in system shutdown and reboot procedures.