Dell Brocade Adapters Installation And Reference Manual page 56

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Adapter features
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LUN masking.
LUN masking establishes access control to shared storage to isolate traffic between different
initiators that are zoned in with the same storage target. LUN masking is similar to zoning,
where a device in a specific zone can communicate only with other devices connected to the
fabric within the same zone. With LUN masking, an initiator port is allowed to only access those
LUNs identified for a specific target.
Enable LUN masking on an adapter physical port through the HCM Basic Port Configuration
dialog box and the BCU fcpim –lunmaskadd command to identify the logical port (initiator) and
remote WWN (target) for the LUN number. Refer to the Brocade Adapter Administrator's Guide
for more information on configuration.
This feature has following limitations.
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Only 16 LUN masking entries are allowed per physical port
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Multiple BCU instances for adding and deleting LUN masking are not supported
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This feature is only supported on Brocade HBAs and on Fabric Adapter ports configured in
HBA mode.
You can configure LUN masking for a particular target even without the actual devices being
present in the network.
When configuring boot over SAN, mask the boot LUN so that the initiator has exclusive access
to the boot LUN. Refer to the Brocade Administrator's Guide for more information.
Quality of Service (QoS) feature working in conjunction with the QoS feature on Brocade
switches to assign high, medium (default), or low traffic priority to a given source or destination
traffic flow.
The following licenses need to be installed on the edge switch connected to each HBA port or
Fabric Adapter ports configured in HBA mode:
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Adaptive Networking (AN) license.
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Server Application Optimization (SAO) license.
To determine if these licenses are installed on the connected switch, execute the Fabric OS
licenseshow command. For more information about Fabric OS commands and QoS support,
refer to the Fabric OS Administrator's Guide.
FCP-IM I/O Profiling
This feature, available through HCM, can be enabled or disabled on a physical port. When
enabled, the driver firmware categories I/O latency data into average, minimum, and maximum
categories. Use this feature to analyze traffic patterns and help tune HBAs, Fabric Adapter port
configured in HBA mode, fabrics, and targets for better performance. Note that enabling this
feature impacts I/O performance.
Interrupt Coalescing
This feature provides a method to delay generation of host interrupts and thereby combine
(coalesce) processing of multiple events. This reduces the interrupt processing rate and
reduces the time that the CPU spends on context switching. You can configure the following
parameters per port to adjust interrupt coalescing:
Brocade Adapters Installation and Reference Manual
53-1002144-01