OpenVMS Cluster Systems - OpenVMS Systems - HP
OpenVMS Cluster Systems - OpenVMS Systems - HP
OpenVMS Cluster Systems - OpenVMS Systems - HP
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Building Large <strong>OpenVMS</strong> <strong>Cluster</strong> <strong>Systems</strong><br />
9.2 General Booting Considerations<br />
• Sufficient network bandwidth<br />
A single Ethernet is unlikely to have sufficient bandwidth to meet the needs<br />
of a large <strong>OpenVMS</strong> <strong>Cluster</strong>. Likewise, a single Ethernet adapter may become<br />
a bottleneck, especially for a disk server. Sufficient network bandwidth can<br />
be provided using some of the techniques listed in step 1 of Table 9–3.<br />
• Installation of only the required layered products and devices.<br />
9.3 Booting Satellites<br />
<strong>OpenVMS</strong> <strong>Cluster</strong> satellite nodes use a single LAN adapter for the initial stages<br />
of booting. If a satellite is configured with multiple LAN adapters, the system<br />
manager can specify with the console BOOT command which adapter to use for<br />
the initial stages of booting. Once the system is running, the <strong>OpenVMS</strong> <strong>Cluster</strong><br />
uses all available LAN adapters. This flexibility allows you to work around<br />
broken adapters or network problems.<br />
The procedures and utilities for configuring and booting satellite nodes are the<br />
same or vary only slightly between Alpha and VAX systems. These are described<br />
in Section 9.4.<br />
In addition, VAX nodes can MOP load Alpha satellites, and Alpha nodes can MOP<br />
load VAX satellites. Cross-architecture booting is described in Section 10.5.<br />
9.4 Configuring and Booting Satellite Nodes<br />
Complete the items in the following Table 9–3 before proceeding with satellite<br />
booting.<br />
Table 9–3 Checklist for Satellite Booting<br />
Step Action<br />
1 Configure disk server LAN adapters.<br />
Because disk-serving activity in an <strong>OpenVMS</strong> <strong>Cluster</strong> system can generate a substantial<br />
amount of I/O traffic on the LAN, boot and disk servers should use the highest-bandwidth<br />
LAN adapters in the cluster. The servers can also use multiple LAN adapters in a single<br />
system to distribute the load across the LAN adapters.<br />
The following list suggests ways to provide sufficient network bandwidth:<br />
Select network adapters with sufficient bandwidth.<br />
Use switches to segregate traffic and to provide increased total bandwidth.<br />
Use multiple LAN adapters on MOP and disk servers.<br />
Use switch or higher speed LAN, fanning out to slower LAN segments.<br />
Use multiple independent networks.<br />
Provide sufficient MOP and disk server CPU capacity by selecting a computer with<br />
sufficient power and by configuring multiple server nodes to share the load.<br />
2 If the MOP server node and system-disk server node (Alpha or VAX) are not already<br />
configured as cluster members, follow the directions in Section 8.4 for using the cluster<br />
configuration command procedure to configure each of the VAX or Alpha nodes. Include<br />
multiple boot and disk servers to enhance availability and distribute I/O traffic over several<br />
cluster nodes.<br />
(continued on next page)<br />
9–4 Building Large <strong>OpenVMS</strong> <strong>Cluster</strong> <strong>Systems</strong>
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