HP DECram for OpenVMS

HP DECram for OpenVMS SPD 34.26.12
Cluster Environment
DECram Versions 8.3, 8.2, 3.2 and 2.5 are fully campat-
ible and there can be any combination of these versions
of DECram in a VMScluster.
DECram Alpha Version 3.2 or higher will run only on
OpenVMS Alpha systems and DECram for Integrity
servers Version 8.2 or higher will run on both Alpha and
Integrity server systems; however, the RAMdisk can be
accessed by OpenVMS VAX and Alpha systems in an
OpenVMS Cluster system.
DECram Versions 8.3 will run in the following configu-
rations:
• AlphaServer systems with OpenVMS Galaxy con-
figured with one or more instances as nodes in an
OpenVMS Cluster
• Standalone OpenVMS Alpha systems
• Standalone OpenVMS Integrity server systems
• OpenVMS Cluster systems consisting of all Alphas
or all Integrity server systems or a combination of
Integrity server, Alpha and VAX systems.
DECram Version 3.2 will run in the following configura-
tions:
• AlphaServer systems with OpenVMS Galaxy con-
figured with one or more instances as nodes in an
OpenVMS Cluster.
• Standalone OpenVMS Alpha systems.
• OpenVMS Cluster systems consisting of all Alphas
or a combination of Alpha and VAX systems.
DECram Version 3.2 can be installed over a previously
installed copy of DECram Version 2.5, on Alpha systems
only. If DECram Version 3.2 is removed for any reason,
DECram Version 2.5 is automatically removed as well.
If you want to continue to run DECram Version 2.5, it
must be reinstalled.
If this is an initial installation of DECram Version 3.2,
using OpenVMS Version 7.2-2 or higher on an Alpha-
based system in a clustered environment, and all nodes
that will be using DECram have a common system disk,
then only one installation of the DECram software on
the cluster is required. However, for each node in the
cluster that will be using the DECram product, a license
key must be installed. If you are installing DECram in
a cluster, be sure there is only one installation active at
any given time.
If this is an initial installation of DECram Version 3.2
using OpenVMS Version 7.2-2 or higher in a clustered
environment and there is no common system disk, the
DECram Version 3.2 software must be installed on each
node of the cluster where you want to create a DECram
disk.
If this is an upgrade of a clustered environment from
DECram Version 2.5 to DECram Version 3.2, the
DECram Version 3.2 software must be installed on all
nodes in the cluster where you want to create a DECram
disk.
Installation of DECram versions prior to DECram Ver-
sion 3.2 on a clustered system requires installation of
the DECram software and a license key for all nodes
that are members of the cluster.
DECram Versions 8.3 is fully supported when installed
on any valid and licensed stadalone or clustered Alpha
or Integrity server system.
DECram Version 3.2 is fully supported when installed
on any valid and licensed standalone or clustered Alpha
system.
DECram Version 2.5 is fully supported when installed on
any valid and licensed standalone Alpha or VAX system,
or any clustered VAX system.
A minimum of DECram Version 2.3 is required for
any OpenVMS Cluster systems running any version of
OpenVMS Alpha.
DECram for OpenVMS Version 3.2 supports operation
in an Adaptive Partitioned Multi-Processing (APMP) en-
vironment, also known as HP Galaxy Software Architec-
ture on OpenVMS. Previous versions of DECram must
not be used if RAM disks are being served, or served
and shadowed, across nodes within a cluster, or if DE-
Cram is being used in an Adaptive Partitioned Multi-
Processing instance.
Multiple DECram devices can be members of a Vol-
ume Shadowing for OpenVMS shadow set. The MDA
devices are compatible across the cluster, but the ac-
tual data is hosted by a single node and that is served
across the cluster via the mass storage control protocol
(MSCP) server.
With DECram Version 3.2 or higher, Volume Shadow-
ing for OpenVMS will support shadow sets composed of
DECram devices and other disk class devices. Removal
of the last non DECram device will cause the shadow
set virtual unit to abort and become unavailable. Please
refer to the Volume Shadowing for OpenVMS Software
Product Description (SPD 27.29.xx) for more informa-
tion.
With DECram Version 3.2 or higher, you can use the
new DECram command interface or continue using the
same familiar commands from SYSMAN for creating,
initializing, and mounting DECram disks.
With DECram Version 3.2 or higher, the disk is config-
ured using the DECRAM> user interface to create and
format the Random Access Memory (RAM) disk. The
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