There are limitations in switch zoning for the SAN Volume Controller and
the HP MA and EMA systems.
Attention: The HP MA and EMA systems are supported
with a single HSG80 controller or dual HSG80 controllers. Because
the SAN Volume Controller only
supports configurations in which the HSG80 cache is enabled in write-back
mode, running with a single HSG80 controller results in a single point
of data loss.
Switch zoning
For SAN Volume Controller clusters
that have installed software version 1.1.1, a single fibre-channel
port that is attached to the system can be present in a switch zone
that contains SAN Volume Controller fibre-channel
ports, whether the HP MA or EMA system uses one or two HSG80 controllers.
This guarantees that the nodes in the cluster can access at most one
port on the HSG80 controller.
For SAN Volume Controller clusters
that have software version 1.2.0 or later installed, switches can
be zoned so that HSG80 controller ports are in the switch zone that
contains all of the ports for each SAN Volume Controller node.
Connecting to the SAN
Multiple ports from
an HSG80 controller must be physically connected to the fibre-channel
SAN to enable servicing of the HP MA or EMA system. However, switch
zoning must be used as described in this topic.
Note: If the HP Command
Console is not able to access a fibre-channel port on each of the
HSG80 controllers in a two-controller system, there is a risk of an
undetected single point of failure.