Specifications

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OpenVMS Operating System for Alpha and VAX (Versions 7.1, 7.1–1H1, 7.1–1H2, and 7.1–2) SPD 41.87.06

The Lock Manager provides synchronized services be-

tween systems in a cluster, for use both by system com-

ponents such as RMS and XQP, and also for direct use

by applications.

Two or more Alpha and VAX computers connected to the

same Memory Channel, CI, DSSI, or SCSI interconnect

must be conﬁgured as members of the same OpenVMS

Cluster system. Mixed-architecture and mixed-version

clusters that contain both Alpha systems and VAX sys-

tems are supported.

OpenVMS Cluster systems provide a uniform comput-

ing environment that is highly scalable, highly available,

and secure. OpenVMS Cluster software implements a

single-security environment within a cluster conﬁgura-

tion. The security subsystem ensures that all cluster-

visible objects maintain consistent security proﬁles and

that system security auditing controls operate cluster-

wide.

Refer to the OpenVMS Cluster Software Product De-

scription (SPD 29.78.xx) for more information.

Volume Shadowing for OpenVMS

Compaq provides Volume Shadowing for OpenVMS Al-

pha and VAX products for performing disk mirroring op-

erations, using a redundant array of independent disks

(RAID) 1 storage strategy.

Volume Shadowing for OpenVMS is available for Alpha

and VAX systems as a separate licensed System Inte-

gration Product (SIP). Volume Shadowing for OpenVMS

provides high data availability for disk devices by ensur-

ing against data loss that results from media deteriora-

tion or controller or device failure. This prevents storage

subsystem component failures from interrupting system

or application tasks.

The system disk and Files-11 On-Disk Structure (ODS-

2,ODS-5) data disks can be volume shadowed.

Volume Shadowing for OpenVMS supports the cluster-

wide shadowing of Compaq SCSI and DSA storage sys-

tems. Volume Shadowing for OpenVMS also supports

shadowing of all MSCP served DSA disks and Compaq

SCSI disks. All disks in a single shadow set must have

the same number of logical blocks and the same phys-

ical geometry. Shadow set members can be located

on a single system or anywhere in an OpenVMS Clus-

ter system. Disks can be conﬁgured on any MSCP or

Compaq SCSI-compliant controller.

Volume Shadowing for OpenVMS provides fault toler-

ance resulting from disk media errors or controller errors

across the full range of Alpha and VAX processors and

conﬁgurations. Shadow set member units can be lo-

cated on different controllers and OpenVMS Alpha and

OpenVMS VAX MSCP servers, providing conﬁguration

ﬂexibility and a high degree of data availability.

Volume Shadowing for OpenVMS supports an unlimited

number of single-member shadow sets and up to 500

disks in multi-member (two or three member) shadow

sets on a standalone or OpenVMS Cluster system.

Phase I of Volume Shadowing (also known as controller-

based shadowing), which was available in the past on

OpenVMS VAX, is no longer supported.

The binary kit for Volume Shadowing ships with the

OpenVMS Alpha and VAX distribution kits. To run the

software, customers must purchase a license. Refer to

the Volume Shadowing for OpenVMS Software Product

Description (SPD 27.29.xx) for more information.

DECnet-Plus and DECnet Software

The DECnet for OpenVMS VAX and Alpha software is

a System Integrated Product (SIP) that is licensed sep-

arately from the OpenVMS operating system. Refer

to the DECnet for OpenVMS VAX and Alpha Software

Product Description (SPD 48.48.xx) for further informa-

tion on supported communications devices and software

features.

DECnet-Plus (formerly DECnet/OSI) is licensed sepa-

rately from the OpenVMS operating system. The license

for DECnet for OpenVMS VAX and Alpha also grants the

rights to use DECnet-Plus. Note that only one version

of DECnet can be active on a single system at any one

time. Refer to the DECnet-Plus for OpenVMS Alpha

Software Product Description (SPD 50.45.xx) and the

DECnet-Plus for OpenVMS VAX Software Product De-

scription (SPD 25.03.xx)) for further information on sup-

ported hardware conﬁgurations and software features.

DigitalTCP/IP Software

Internet networking is available through the Compaq TCP/IP

Services for OpenVMS layered product. This prod-

uct provides TCP/IP networking, Network File System

(NFS), File Transfer Protocol (FTP), Remote Terminal

Services (TELNET), and other features. Refer to the

Digital TCP/IP Services for OpenVMS Software Prod-

uct Description (SPD 46.46.xx) for further information.

RMS Journaling for OpenVMS

Compaq provides the RMS Journaling for OpenVMS Al-

pha and VAX products as separately licensed SIPs that

enable a system manager, user, or application to main-

tain the data integrity of RMS ﬁles in the event of a

number of failure scenarios. These journaling products

protect RMS ﬁle data from becoming lost or inconsis-

tent.

RMS Journaling provides the following three types of

journaling:

• After-image journaling. Allows users to reapply

modiﬁcations that have been made to a ﬁle. This

type of journaling allows users to recover ﬁles that