Caché System Administration Guide - InterSystems Documentation

Using Multiple Instances of Caché
The special considerations for multiple instances are:
• Each instance must be version 4.0 or later of Caché. For example, Caché 5.1 and 3.2.1 cannot run
on the same machine at the same time.
• Multiple instances can share the same multiserver key, but if they do, they must use the same
license server or set of license servers. Each system running an instance of Caché under the auspices
of one or more license servers must have a local copy of the authorizing license key file installed
in every instance.
• Multiple instances can be networked.
• Protection is included against simultaneous database use (that is, each instance must have its own
databases and cannot access or modify another instance’s databases).
• Only one instance per NIC (network interface card) can use DDP (Distributed Data Protocol) or
DCP (Distributed Cache Protocol) over Ethernet. DDP and DCP are older distributed data protocols
that are supported for interoperation with legacy applications. If a machine has more than one
NIC, each instance must point to a unique NIC. This restriction does not apply to DCP over UDP
(User Datagram Protocol).
• Each instance must have unique port numbers. See the next section for information on how to Set
Port Numbers.
Note:
Please see the Multiple Caché Installation Issues section of the Caché Installation Guide for
important facts when installing multiple instances of Caché on the Windows platform.
9.4.1 Set Port Numbers
For a standard, single instance of Caché, the SuperServer port number is 1972 by default. For multiple
instances of Caché 4.0 and later on a single machine, each must have a unique port number. During
installation, subsequent instances are assigned the next available port if you choose to set it automatically,
or you can manually enter port numbers during the installation. A standard installation sets the
following port numbers for your Caché instance as follows:
• SuperServer port number — 1972 or the first available subsequent number equal to or higher
than 56773
• Web server port number — 57772 or the first available subsequent number
• Telnet port number — 23
You most likely do not need to change the SuperServer or Web server port numbers because of the
way the Caché installation assigns them. However, you do need to assign each instance a unique Telnet
port number. You can change the SuperServer port value after installation from the [Home] > [Configuration]
> [Memory and Startup] page of the System Management Portal, and you can change the Web
server and Telnet port values after installation from the [Home] > [Configuration] > [Startup Settings]
96 Caché System Administration Guide