OpenVMS Cluster Systems - OpenVMS Systems - HP

OpenVMS Cluster Interconnect Configurations
3.6 Multihost SCSI OpenVMS Cluster Systems
Figure 3–8 Three-Node OpenVMS Cluster Configuration Using a Shared SCSI
Interconnect
Shared SCSI Storage
SCSI bus
T T
Client
Server
Server
Client Client
LAN
ZK−7479A−GE
3.7 Multihost Fibre Channel OpenVMS Cluster Systems
OpenVMS Cluster systems support FC interconnect as a storage interconnect.
Fibre Channel is an ANSI standard network and storage interconnect that offers
many advantages over other interconnects, including high-speed transmission and
long interconnect distances. A second interconnect is required for node-to-node
communications.
3.7.1 Design
OpenVMS Alpha supports the Fibre Channel SAN configurations described in
the latest Compaq StorageWorks Heterogeneous Open SAN Design Reference
Guide and in the Data Replication Manager (DRM) user documentation. This
configuration support includes multiswitch Fibre Channel fabrics, up to 500
meters of multimode fiber, and up to 100 kilometers of single-mode fiber. In
addition, DRM configurations provide long-distance intersite links (ISLs) through
the use of the Open Systems Gateway and wave division multiplexors. OpenVMS
supports sharing of the fabric and the HSG storage with non-OpenVMS systems.
OpenVMS provides support for the number of hosts, switches, and storage
controllers specified in the StorageWorks documentation. In general, the number
of hosts and storage controllers is limited only by the number of available fabric
connections.
Host-based RAID (including host-based shadowing) and the MSCP server are
supported for shared Fibre Channel storage devices. Multipath support is
available for these configurations.
For a complete description of these configurations, see Guidelines for OpenVMS
Cluster Configurations.
OpenVMS Cluster Interconnect Configurations 3–13