Table of Contents
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Introduction
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Interrupt time delay. There is a time delay during which the host generates interrupts. You can
increase this delay time and thereby coalesce multiple interrupt events into one. This results in
fewer interrupts for interrupt events.
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Interrupt latency timer. An interrupt is generated when no new reply message requests occur
after a specific time period. You can adjust this time period and thereby minimize I/O latency.
16 Virtual Channels (VCs) per port. VC-RDY flow control can use these multiple channels for
Quality of Service (QoS) and traffic prioritization in physical and virtualized network
environments.
Target rate limiting.
You can enable or disable this feature on specific ports using BCU commands and HCM. Target
rate limiting relies on the storage driver to determine the speed capability of discovered remote
ports, then uses this information to throttle FCP traffic rates to slow-draining targets. This reduces
or eliminates network congestion and alleviates I/O slowdowns at faster targets.
Target rate limiting is enforced on all targets that are operating at a speed lower than that of the
target with the highest speed. If the driver is unable to determine a remote port's speed, 1 Gbps is
assumed. You can change the default speed using BCU commands and HCM. Target rate limiting
protects only FCP write traffic.
For more information on BCU commands to control target rate limiting, refer to the Brocade
Adapters Administrator's Guide.
Target Reset Control. As part of error recovery for I/O requests, operating systems rely on logical
unit reset, target reset, and bus reset in that order. While logical unit reset affects the logical unit
where the I/O request encountered an error, target reset affects all logical units configured for the
specified target. In configurations with a tape target, a target reset issued while a backup job is
running can cause the job to abort on all logical units created for the target. Target Reset Control
allows you to specifically disable resets for specific targets, thereby preventing effects on other
logical units.
You can use BCU commands to enable target reset, disable target reset for a remote port, and
display a list of initiator vs. target WWNs with target reset disabled, For more information on BCU
commands, refer to the Brocade Adapters Administrator's Guide.
A bus reset issues target resets to all targets on a specific bus. Targets are not reset for which target
reset has been disabled with a BCU command.
N_Port ID Virtualization (NPIV)
Allows multiple N_Ports to share a single physical N_Port. Multiple Fibre Channel initiators can
share this single physical port and reduce SAN hardware requirements.
Server Application Optimization (SAO). When used with Brocade storage fabrics with enabled
SAO licensing, Fibre Channel ports can use advanced Adaptive Networking features, such as QoS,
designed to ensure Service Level Agreements (SLAs) in dynamic or unpredictable enterprise-class
virtual server environments with mixed-SLA workloads.
Boot over SAN. This feature provides the ability to boot the host operating system from a boot
device located somewhere on the SAN instead of the host's local disk or direct-attached Fibre
Channel storage. Specifically, this "boot device" is a logical unit number (LUN) located on a
storage device.
Fabric-based boot LUN discovery, a feature that allows the host to obtain boot LUN information
from the fabric zone database.
Features and specifications
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