ServerNet Cluster Manual

Upgrading a ServerNet Cluster
ServerNet Cluster Manual—520575-003
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Updating the Firmware and Configuration
Upgrading SANMAN Before Loading New Configuration
Beginning with the G06.12 configuration, all pass-through ServerNet data traffic is by
default disabled on the ServerNet II switch ports. The G06.12 and superseding
versions of SANMAN enable switch ports after ensuring that neighbor checks for the
ports have passed. The neighbor check logic is a new functionality implemented by
SANMAN in G06.12. Neighbor checking ensures that the cluster has been properly
cabled, and the cluster switches properly configured, before enabling pass-through
ServerNet data traffic in ServerNet ports.
Previous versions of SANMAN do not implement the neighbor check logic.
Consequently, a node running a version of SANMAN earlier than G06.12 cannot
enable ports on cluster switches running a G06.12 or later configuration. However,
such a node can perform all switch manageability functions available in versions of
SANMAN earlier than G06.12.
Manageability traffic is always enabled on ServerNet II Switch ports, whether or not
pass-through ServerNet data traffic is enabled or disabled. A node running a version of
SANMAN earlier than G06.12 does not know it must enable ports on the nearest
switches to allow regular (non-IBC) data traffic to and from the cluster to commence.
The SNETMON/MSGMON running on that node cannot discover other remote nodes,
and Expand-over-ServerNet lines for that node will not come up.
To avoid this problem, you must upgrade SANMAN on all nodes to G06.12 or a later
version before loading the new configuration on the switches.
The configuration running on the cluster switch defines the default state for the switch
ports. The firmware starts the ports on the default state set by the configuration as
follows:
In this configuration . . . Ports are . . .
T0569AAA Enabled by default
T0569AAB or superseding Disabled by default