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HP OpenVMS Cluster Software
SPD 29.78.27
bridge or the Network Storage Router bridge are sup-
•
VAX-11/7xx, VAX 6000, VAX 7000, VAX 8xxx, VAX
ported. As is true with SCSI, systems connected to a
9000, and VAX 10000 series systems require a sys-
multihost Fibre Channel bus must also be configured
tem disk that is accessed via a local adapter or
with another interconnect to provide system-to-system
through a local CI or DSSI connection. These sys-
communication.
tems cannot be configured to boot as satellite nodes.
Ethernet,
ATM,
and
FDDI
are
industry-standard,
•
All systems connected to a common CI, DSSI, or
general-purpose communications interconnects that can
Memory Channel interconnect must be configured
be used to implement a local area network (LAN). Ex-
as OpenVMS Cluster members.
OpenVMS Clus-
cept where noted, OpenVMS Cluster support for these
ter members configured on a CI, DSSI, or Memory
LAN types is identical. The ATM device must be used as
Channel will become members of the same Open-
an emulated LAN configured device. Ethernet and FDDI
VMS Cluster (this is imposed automatically by the
provide system-to-system communication. Storage can
OpenVMS Cluster software). All systems connected
be configured in FDDI environments that support FDDI-
to a multihost SCSI bus must be configured as mem-
based storage servers.
bers of the same OpenVMS Cluster.
•
An OpenVMS Cluster system can include any num-
OpenVMS Cluster configurations can be configured us-
ber of star couplers. Table 2 shows the number of CI
ing wide area network (WAN) infrastructures, such as
adapters supported by different systems. The num-
DS3, E3, and ATM. Connection to these media is
ber of star couplers that a system can be connected
achieved by the use of WAN interswitch links (ISLs).
to is limited by the number of adapters with which it
is configured.
Memory Channel is a high-performance interconnect
that provides system-to-system communication. Mem-
•
The maximum number of systems that can be con-
ory Channel does not provide direct access to storage,
nected to a star coupler is 16, regardless of star cou-
so a separate storage interconnect is required in Mem-
pler size.
ory Channel configurations.
•
The KFQSA Q-bus to DSSI adapter does not support
Configuration Rules
system-to-system communication across the DSSI;
systems using this adapter must include another in-
•
Mixed-architecture clusters are limited to two types
terconnect for system-to-system communication.
of architecture-based configurations. The first is the
•
The maximum number of systems that can be con-
long-standing VAX and AlphaServer mixed clusters.
nected to a DSSI is four, regardless of system or
The second is a mixed AlphaServer and Integrity
adapter type. Any mix of systems and adapters is
server cluster. These are fully supported configu-
permitted, except where noted in the Hardware Sup-
rations.
port section of this SPD. Depending on the system
•
Support of a VAX server with an Integrity server sys-
model, it may not be possible to configure four sys-
tem in a mixed-architecture cluster (with or without
tems on a common DSSI bus because of DSSI bus
AlphaServers included) is not a formally supported
cable-length restrictions. Refer to the specific system
configuration for production environments. This type
system configuration manuals for further information.
of configuration, however, can be used temporarily
•
The maximum number of AlphaServer systems that
as an interim step for the purposes of development
can be connected to a SCSI bus is 3. If the SCSI
and migration, as applications are moved from VAX
bus includes a five-port or greater Fair Arbitration
to either an AlphaServer or Integrity server platform.
SCSI Hub (DWZZH–05), the maximum number of
Should a problem arise while using this type of con-
AlphaServer systems is increased to 4. Starting with
figuration, the customer will be advised to either re-
OpenVMS Version 8.2-1, a maximum of 2 Integrity
vert back to their VAX-Alpha cluster environment, or
server systems can be connected to a SCSI bus.
remove the VAX from the cluster that contains In-
This configuration has several restrictions, which are
tegrity server systems.
documented in HP OpenVMS Version 8.2–1 for In-
tegrity Servers New Features and Release Notes.
•
The maximum number of systems supported in an
OpenVMS Cluster system is 96.
With OpenVMS
•
The maximum number of multihost SCSI buses to
Version 8.2 for Integrity servers, a restriction exists
which an AlphaServer system can be connected to
where the maximum mixed-architecture cluster node
is 26.
count is 16. For OpenVMS V8.2-1 for Integrity server
systems and later, this restriction has been removed.
•
The configuration size for Fibre Channel storage in-
creases on a regular basis with new updates to
•
Every system in an OpenVMS Cluster system must
OpenVMS. As such, please refer to the Guidelines
be connected to every other system via any sup-
for OpenVMS Cluster Configurations manual for the
ported OpenVMS Cluster interconnect (see Table 1).
most up-to-date configuration capabilities.
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