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Important notes
Table 5 through Table 10 list issues to consider when using XPath OS 7.4.1f and the HP StorageWorks
MP Router.
Table 5 Fibre Channel routing services
Issue
Description
These messages can occur during normal operation. However, if the
MP Router reports numerous occurrences that cannot be correlated to actual
initiated events, such as planned device reconfigurations or reboots, examine
Unexpected LSAN Zone Update
low-level port error counts using the portstatsshow command.
messages or unexpected physic-
Faulty cables and SFPs that cause interruptions in EX_Port connectivity might
al device offline messages
also cause unexpected fabric reconfigurations. In the event of unexpected
fabric reconfigurations, ensure that there are no low-level errors occurring
on ports and focus diagnostic efforts on cables and SFPs.
Remote WWNs cannot be in both a Logical Storage Area Network (LSAN)
zone and a local fabric zone of fabrics that they do not physically reside
in. Putting them in both locations may result in excessive boot times for host
or servers in fabrics connected to the MP Router.
If a remote node WWN is in an LSAN zone, it cannot also be in a local
Zoning restrictions for LSAN
non-LSAN zone in a fabric that it does not physically reside in. For example,
zones and local fabric zones
if you have a host or storage device defined in a remote fabric zone and
want to add either of these devices to an LSAN zone, you must ensure that
these devices are not listed in any local zones other than the physical fabric
they reside in. Local WWNs are allowed in both an LSAN zone and the
local zones of the fabric where they are physically located.
If you configure multiple EX-port connections to the same fabric using different
Fabric IDs, the port error Fabric ID oversubscribed displays. While
Fabric ID oversubscribed mes-
the Fabric ID used for each fabric connected to the MP Router is unique, all
sage
EX-ports connected to the same fabric from the MP Router must use the same
Fabric ID.
In certain large routed fabrics with large numbers of EX_Ports (for example,
8 or fewer) connected to each fabric (usually done for bandwidth for large
numbers of shared initiators and targets across fabrics) and a large number
HBA configuration
of shared devices (for example, 800 or fewer), set the PLOGI timeout
value for 1 Gbps JNI FC HBAs to 3000 ms. This will allow time for the
routed fabric to answer PLOGI requests.
In a non-routed SAN, if there are multiple E_Port links between two switches
and fabric reconfigurations occur due to the loss of a single E_Port link,
traffic around the fabric is generally not interrupted. If interruptions occur,
they are brief (less than one second).
Due to a design decision in this release of the router, traffic disruption for
routed traffic always occurs for a short period (less than one second), even
if EX_Port links remain available. The manager of a non-routed SAN will
Meta-SAN traffic
not expect this performance characteristic.
During testing, applications have been shown to tolerate the traffic disruption
in the routed fabric and to recover based on an application-specific recovery
timeline, which is typically longer than when the fabric allows traffic to flow
again. However, the commonly used I/O test tool, Iometer, is known to
panic or crash under certain circumstances of traffic disruption; this has
occurred in large routed fabric configurations.
Multi-protocol Router XPath OS 7.4.1f
7
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