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OpenVMS cluster software version 7.3-1

Summary of OpenVMS Cluster Software Enhancments

This section provides an overview of the following new OpenVMS Cluster Software features that are available in Version 7.3-1.

Fibre Channel I/O New Features


Multipath Failover to MSCP served path

  • Provides automatic and manual failover from a direct Fibre Channel or SCSI storage path to an MSCP served path
  • Provides Cluster-aware applications the ability to continue running and access necessary data even if all direct links to the storage have been broken (automatic failover to the served path)
  • Allows a cluster system manager to manually redirect storage access from a broken direct path to the cluster MSCP served path for Fibre Channel and SCSI Storage
  • Enhances the already robust OpenVMS Disaster Tolerance capabilities with a more powerful failover capability, resulting in access to necessary data regardless of the type of data access failure in the cluster environment

Multipath Tapes on Fibre Channel

  • Implement multipath for tapes on Fibre Channel
  • All possible paths from an Alpha system to a Fibre tape will be configured and made available
  • The exact path will be selectable via a DCL command.
  • In the event of a broken connection, automatic failover will take place
  • Provides multi-path capability for Fibre Channel tapes
  • Supports the same multipath failover model for tapes that is supported for FC-attached disks
  • Provides for true “High Availability” model for both Tape and Disk devices in an FC SAN Environment

Performance enhancements for KGPSA Fibre Channel Adapter

  • Multiple device interrupts combined into single interrupt
  • Various other driver enhancements for the KGPSA
  • Improved throughput for frequent cluster operations due to a more efficient method of handling I/O interrupts
  • Less CPU Overhead per I/O on very heavy I/O loads (up to 25-40% reduction)
  • Reduction in overall driver CPU usage by 10-30%

Improved System and Application Performance


Cluster Performance Improvements

  • Significant reduction in system overhead for various components of cluster communications, cluster I/O, and the VMS lock manager, for both distributed and local locking
  • Improved throughput for cluster locking, messages, data transfers
  • Reduced system overhead for frequent cluster operations
  • Improved throughput for local locking
  • Reduction in nonpaged pool overhead and image sizes