This article discusses how to configure DDP (Distributed Data Protocol) for
peer to peer connections between DSM and Caché.
Important notes before you get started:
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Both your DSM system and your Caché system each needs an Ethernet
card for DDP to work between the boxes. You will require the DDP group number of your
DSM system. Also, the Caché system needs to be in the same subnet as the DSM
system.
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The InterSystems packet driver has to be bound to your Ethernet card
and removed from your virtual cards (dial-up networking, dial-up networking/VPN, MS
virtual private networking). The InterSystems packet driver needs to be one of the
first protocols bound to your Ethernet card. This is also the protocol that is used
for LAT service on Caché.
This article includes procedures for the following processes:
Install Packet Driver on Windows 2000
You should copy both the
.inf and
.sys files
to the same directory for installation on Windows 2000. On the Caché distribution
CD this is the
win2k folder in the
drivers directory.
Installation instructions are as follows:
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Enter the path to the packet driver kit and click
Browse.
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Restart Windows 2000. This is necessary now because there is currently
a problem finding adapters on the first try following installation. An alternative
to restarting Windows 2000 is to start up Caché, then shut down and restart
Caché.
Configure Connection in Caché 4.x
To configure the DDP connection enter the network configuration information
using the
Advanced tab of the Caché
Configuration
Manager:
Enter the information in the following branches of the
Network tree:
To enter the DSM-DDP network configuration information:
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Select
DDP Host and click
Change.
Enter a DDP host three-letter name for the Caché system (
ZZZ,
for example) and click
OK.
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Ethernet Devices Mappings
From the DSM-DDP branch, enter the mapping configuration information for the
Ethernet devices:
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Select
Device and click
Change.
Enter the Caché system Ethernet ID (
ie1 or
elnk31,
for example). It is stated in
IPCONFIG as your Ethernet adapter.
Predefined Remote Volume Sets
Enter all the volume sets on your DSM system that you want to access, one at
a time:
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Select
Volume Set and click
Change.
Enter the name of the volume set on the DSM system that you want to access and click
OK.
Repeat these steps for each volume set. As you enter each one, it is listed
in the volume set list:
If you cannot see the globals on the DSM system, try the following troubleshooting
procedures:
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Make sure your license allows for networking and has enough spare
network connections to have a
RECEIVE and
DMNNET job
running.
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Reinstall the InterSystems packet driver.
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Make sure the packet driver is not bound to a dial-up adapter or other
virtual cards.
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Check to make sure the DDP group matches your Caché configuration.
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Check global protections.
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Check DDP network status.
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Make sure that the account you use to change the DDP settings has
the ability to modify resources correctly. The DDP connection from Caché needs
to be to the node that is the cluster master of the volume sets.
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Make sure that the
BYTLM is set high enough (200,000
is recommended as a minimum).