Designating nodes on a LAN to one or more of the above types is application dependent. The following should be considered:
Economy | If the network considerations dictate that a disk is not needed at a |
| particular node, then a minimum system for execute"only capabilities may |
| be a good choice. If this is the case, a Slave Node containing only the Node |
| Manager software File Server module (NMGR, described later) is |
| configured. This module requires approximately 26"pages of physical |
| memory. |
Performance | Software overhead and disk accesses by Node Manager software may |
| impact node performance. Depending on the application, network accesses |
| by Node Manager may add to network traffic, but this should be negligible. |
| Slave Nodes might be considered for high performance, execute"only |
| applications, and are normally configured to update or retrieve file data at |
| a remote disk"based node over the LAN. |
| At least one HP 1000 node on the LAN must be a Manager Node and |
| contain all Node Manager software modules. If file storage for other nodes |
| on the network is required, it may be a File Server node as well. |
Security | The Node Manager software is a powerful utility with significant impact on |
| LAN operations. Security will depend upon the user's selective |
| configuration of Node Manager software modules operating on any |
| particular node. The Node Manager •User Interface" modules (NM and |
| NM2, described later) installed on a node will permit users to reconfigure |
| the network virtually without restriction. For this reason, it is |
| recommended that User Interface modules be configured only on nodes |
| where the person designated as the Network Manager exercises direct |
| control. |
High Availability | Maximum uptime operation for the network or individual nodes may be |
| important. Individual nodes that fail may lose their link configuration data. |
| File Server Nodes maintaining this information on disk should be located in |
| areas least likely to be disturbed. |
| A distribution of File Server Nodes around the network may help to |
| minimize the number of nodes downed by a failed File Server Node. |
| In continuous process applications, battery backup and spare LANIC cards |
| at Manager and File Server Nodes may be considered. |
1%8 Introduction