Technical data

5.7 Maintaining Memory Channel Interconnects
The following sections contain information about maintaining Memory
Channel interconnects. See other sections in this chapter or the Memory
Channel
User’s Guide for detailed information about maintaining the
Memory Channel hardware. Topics in this section include:
• Adding a Memory Channel interconnect (Section 5.7.1)
• Upgrading Memory Channel adapters (Section 5.7.2)
• Upgrading a virtual hub configuration to a standard hub configuration
(Section 5.7.3)
5.7.1 Adding a Memory Channel Interconnect
If you want to change from a single Memory Channel interconnect to
redundant Memory Channel interconnects without shutting down the
cluster, follow the steps in Table 5–4, which covers adding a Memory
Channel interconnect and rolling from a dual MC1 interconnect to a dual
MC2 interconnect. Most of the steps are the same.
5.7.2 Upgrading Memory Channel Adapters
If you have a TruCluster Server configuration with redundant MC1
interconnects and want to upgrade to MC2 interconnects, you can do so
without shutting down the entire cluster.
When performing an upgrade from MC1 interconnects, which use 128 MB
Memory Channel address space, to MC2, which uses either 128 or 512 MB
Memory Channel address space, all Memory Channel adapters must be
operating at 128 MB Memory Channel address space (the default) until
the last adapter has been changed. At that time the address space can be
increased to 512 MB if all MC2 adapters are jumpered for 512 MB.
This section covers adding a Memory Channel interconnect and the following
rolling upgrade situations:
• Dual, redundant MC1 interconnects in virtual hub mode (Table 5–4
and Figure 5–2)
• Dual, redundant MC1 interconnects in standard hub mode (Table 5–4
and Figure 5–3 through Figure 5–8)
The figures following Table 5–4 provide two sequences that you can follow
while carrying out the steps of Table 5–4. Figure 5–2 shows a dual,
redundant virtual hub configuration using MC1 hardware being upgraded
to MC2. Figure 5–3 through Figure 5–8 show a three-node standard hub
configuration being upgraded from MC1 to MC2.
5–14 Setting Up the Memory Channel Cluster Interconnect