IBM Flex System FC5024D User Manual page 14

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Features and specifications
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The feature only works in R_RDY mode and not in VC_RDY mode, therefore it is enabled
with FA-PWWN and forward error correction (FEC), but not supported when N_Port trunking
or QoS are enabled. Note that FEC is supported on 16 Gbps ports only.
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The feature is not supported when a port is in D_Port mode.
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Lost credits are recovered during a link reset.
Diagnostic (D_Port)
When a switch or adapter port is enabled as a Diagnostic (D_Port), electrical loopback, optical
loopback, and link traffic diagnostic tests will initiate on the link between the adapter and the
connected switch port. Results can be viewed from the switch using Fabric OS commands. Results
can be viewed from the adapter using BCU commands and HCM. Once an adapter port is enabled
as a D_Port, the port does not participate in fabric operations, log in to a remote device, or run data
traffic. D_Port testing is supported only on Brocade 16 Gbps switches running Fabric OS v7.1.0 or
later. To configure this feature on adapters, refer to the Brocade Adapters Administrator's Guide.
Enhanced Hibernation support
Before Windows Server 2012, the driver used proprietary logic to pass on special LUN details
through the adapter flash memory. With Windows Server 2012, the driver can reliably identify the
LUN used for booting the operating system and storing the paging file. The paging file can also
reside on a non-boot LUN spanning different adapter ports.
Fabric Assigned Port World Wide Name (FA-PWWN)
This is a feature of Dynamic Fabric Provisioning (DFP). FA-PWWN allows the adapter port to
acquire its port world wide name (PWWN) from the switch port when it logs into the fabric. An
FA-PWWN is a "virtual" port WWN that can be used instead of the physical PWWN to create
zoning and LUN mapping and masking.
FA-PWWN is only supported on Brocade switches running Fabric OS 7.0 and later.
Quality of Service (QoS) feature working in conjunction with the Advanced SAN Fabric QoS
feature on Brocade switches to assign high, medium (default), or low traffic priority to a given
source or destination traffic flow.
Default bandwidth settings for QoS priority levels are 60% for high, 30% for medium, and 10% for
low. You can use BCU commands to change percentages for the different priority levels. Refer to
the Brocade Adapters Administrator's Guide for more information. Note that set percentages are
the percentage of the available link speed. Therefore, setting 25% for an 8 Gb link, would be 2 Gb.
FCP-IM I/O Profiling
This feature, available through HCM, can be enabled or disabled on a physical port. When enabled,
the driver firmware categorizes I/O latency data into average, minimum, and maximum categories.
Use this feature to analyze traffic patterns and help tune Fibre Channel adapter ports, 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 combines
(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:
IBM Flex System FC5024D 4-Port 16Gb FC Adapter User's Guide