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2.8.4 Deciding Whether to Run the Agents in Protected
Memory
On a NetWare server, using protected memory allows you to create isolated memory spaces where
NLM
programs can run without affecting other NLM programs running on the same node. This
TM
contributes to the high availability of the cluster. Using protected memory has the following
advantages:
When using protected memory, the node can restart a specific memory space if any NLM
program within that memory space abends. This allows for recovery without failing the entire
node, which enhances both up time and database integrity.
Using protected memory gives you the ability to unload a single instance of an agent, rather
than all instances.
If you use protected memory, you can run the agents in active/active mode, rather than active/
passive mode.
If you have any possibility of the same type of GroupWise agent loading multiple times on any node
in the cluster, you must use protected memory so that you can unload agents individually. Check
your failover paths
multiple instances of the same type of agent might need to run on the same node.
Protected memory does result in higher memory utilization (about 5% to 10%) and a slight
performance penalty. Make sure your nodes have sufficient memory to handle the number of
memory spaces that might reside on them. Keep in mind that if you load the MTA and the POA in
different memory spaces, the agent engine (
provide memory for any GroupWise volumes that could fail over to a node, in addition to that
node's regular processing load.
IMPORTANT: For optimum stability, we strongly recommend that you run the agents in protected
memory, with one agent per memory space.
AGENT CLUSTERING WORKSHEET
Under
Item 8: Load Agents in Protected
GroupWise agents in protected memory.
If you will use protected memory, provide one or two unique protected memory space names. If you
will create the domain and post office on the same GroupWise volume, the MTA and POA can use the
same memory space, although this is not recommended. If you will create the domain and post office
on different GroupWise volumes, the MTA and POA must use different memory spaces.
2.8.5 Planning the NetWare Agent Installation
Aside from the cluster-specific issues discussed in the preceding sections, the considerations
involved in planning to install the GroupWise NetWare agents are the same in a clustering
environment as for any other environment. Review
and fill out the
in the
GroupWise 8 Installation Guide
and/or POA.
Fill out the NetWare Agent Worksheet, taking into account the following cluster-specific issues:
34
GroupWise 8 Interoperability Guide
(Agent Clustering Worksheet items 3 and
Memory?, mark whether or not you need to run the
"GroupWise Agent Installation Summary
for each location where you will install the NetWare MTA
6) for failover combinations where
) will load twice on the node. Remember to
gwenn5.nlm
"Planning the GroupWise
Sheet" in
"Installing GroupWise
Agents", then print
Agents"
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