Technical data

startup error message on the ES45 jumpered for 128 MB states:
panic: MC2 adapter has too little memory
See Section 3.5 if you intend to add an ES45 system with dual Memory
Channel adapters jumpered for 128 MB into an existing cluster with
Memory Channel adapters jumpered for 512 MB.
• The Memory Channel API is not supported for data transfers larger than
8 KB when loopback mode is enabled in two member clusters configured
in virtual hub mode.
See the TruCluster Server Version 5.1A
QuickSpecs for more information.
• A mixed-version dual Memory Channel configuration (MC1 and MC2
or MC1.5 and MC2) is not supported in a cluster containing an ES45
because the ES45 only supports MC2.
• If you configure a cluster with a single rail Memory Channel in standard
hub mode and the hub fails or is turned off, every cluster member panics.
They panic because no member can see any of the other cluster members
over the Memory Channel interface. A quorum disk does not help in this
case, because no system is given the opportunity to obtain ownership
of the quorum disk and survive.
To prevent this situation in standard hub mode, install a second Memory
Channel rail. A hub failure on one rail will cause failover to the other rail.
When the Memory Channel is set up in standard hub mode, the Memory
Channel hub must be visible to each member’s Memory Channel adapter.
If the hub is powered off, no system is able to boot.
• If a TruCluster Server cluster configuration utilizes multiple Memory
Channel adapters in standard hub mode, the Memory Channel adapters
must be connected to separate Memory Channel hubs. The first Memory
Channel adapter (mca0) in each system must be connected to one
Memory Channel hub. The second Memory Channel adapter (mcb0)in
each system must be connected to a second Memory Channel hub. Also,
each Memory Channel adapter on one system must be connected to the
same linecard in each Memory Channel hub.
• The maximum length of an MC2 BN39B link cable is 10 meters (32.8
feet).
• You can use a CCMFB optical converter in conjunction with the MC2
CCMAB host bus adapter or a CCMLB hub line card to increase the
distance between systems.
If you use a CCMFB Memory Channel optical converter module, which is
a 5.0V module, it must be plugged into PCI slot 3, 6, 9, or 10.
The BN34R fiber-optic cable, which is used to connect two CCMFB
optical converters, is available in 10-meter (32.8-foot) (BN34R-10) and
2–6 Hardware Requirements and Restrictions