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Table 5–1: MC1 and MC1.5 Jumper Configuration (cont.)
If hub mode is: Jumper: Example:
Virtual: VH0 Pins 2 to 3
123
Virtual: VH1 None needed; store the jumper on pin 1 or 3
123
If you are upgrading from virtual hub mode to standard hub mode (or from
standard hub mode to virtual hub mode), be sure to change the jumpers on
all Memory Channel adapters on the rail.
5.1.2 MC2 Jumpers
The MC2 module (CCMAB) has multiple jumpers. They are numbered right
to left, starting with J1 in the upper righthand corner (as you view the
jumper side of the module with the endplate in your left hand). The leftmost
jumpers are J11 and J10. J11 is above J10.
Most of the jumper settings are straightforward, but the window size
jumper, J3, needs some explanation.
If a CCMAA adapter (MC1 or MC1.5) is installed, 128 MB of address space is
allocated for Memory Channel use. If a CCMAB adapter (MC2) PCI adapter
is installed, the memory space allocation for Memory Channel depends on
the J3 jumper and can be 128 or 512 MB.
If two Memory Channel adapters are used as a failover pair to provide
redundancy, the address space allocated for the logical rail depends on the
smaller window size of the physical adapters.
During a rolling upgrade (see Section 5.7) from an MC1 failover pair to an
MC2 failover pair, the MC2 modules can be jumpered for 128 MB or 512 MB.
If jumpered for 512 MB, the increased address space is not achieved until
all MC PCI adapters have been upgraded and the use of 512 MB is enabled.
On one member system, use the sysconfig command to reconfigure the
Memory Channel kernel subsystem to initiate the use of 512 MB address
space. The configuration change is propagated to the other cluster member
systems by entering the following command:
# /sbin/sysconfig -r rm rm_use_512=1
Setting Up the Memory Channel Cluster Interconnect 5–3