OpenVMS Cluster Systems - OpenVMS Systems - HP

Introduction to OpenVMS Cluster System Management
1.2 Hardware Components
• Controllers and I/O servers, including the following:
Controller Interconnect
HSC CI
HSJ CI
HSD DSSI
HSZ SCSI
HSG FC
In addition, the K.scsi HSC controller allows the connection of the
StorageWorks arrays with SCSI devices on the HSC storage subsystems.
Note: HSC, HSJ, HSD, and HSZ controllers support many combinations
of SDIs (standard disk interfaces) and STIs (standard tape interfaces) that
connect disks and tapes.
1.3 Software Components
The OpenVMS operating system, which runs on each node in the OpenVMS
Cluster, includes several software components that facilitate resource sharing and
dynamic adjustments to changes in the underlying hardware configuration.
If one computer becomes unavailable, the OpenVMS Cluster system continues
operating because OpenVMS is still running on the remaining computers.
1.3.1 OpenVMS Cluster Software Functions
The following table describes the software components and their main function.
Component Facilitates Function
Connection
manager
Distributed lock
manager
Distributed file
system
Distributed job
controller
Member integrity Coordinates participation of computers in the cluster and
maintains cluster integrity when computers join or leave
the cluster.
Resource
synchronization
Synchronizes operations of the distributed file system, job
controller, device allocation, and other cluster facilities. If
an OpenVMS Cluster computer shuts down, all locks that
it holds are released so processing can continue on the
remaining computers.
Resource sharing Allows all computers to share access to mass storage and
file records, regardless of the type of storage device (DSA,
RF, SCSI, and solid state subsystem) or its location.
Queuing Makes generic and execution queues available across the
cluster.
MSCP server Disk serving Implements the proprietary mass storage control protocol
in order to make disks available to all nodes that do not
have direct access to those disks.
TMSCP server Tape serving Implements the proprietary tape mass storage control
protocol in order to make tape drives available to all nodes
that do not have direct access to those tape drives.
1–4 Introduction to OpenVMS Cluster System Management