HP 4400 HP StorageWorks Fabric OS 6.4.0c Release Notes (5697-0703, September 2 - Page 7

Bottleneck Detection enhancements, Enhanced traffic isolation zones support, Lossless DLS enhancements

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Bottleneck Detection enhancements Fabric OS 6.4.0 enhanced bottleneck detection capability by adding support for congestion detection at E, Ex, and F ports. Bottleneck monitoring configuration was greatly simplified in Fabric OS 6.4.0 by allowing switch-level enablement of this feature for both latency and congestion bottleneck monitoring. New enhancements allow users to configure separate thresholds for detecting latency bottleneck and congestion bottleneck conditions. Bottleneck monitoring alerts can be configured on a per port basis and are delivered through SNMP traps and RAS logs. Fabric OS 6.3.1b introduced several changes and enhancements that are also included in Fabric OS 6.4. These changes are not fully documented in existing administrator guides or other materials but will be captured in future documentation and existing documentation updates and revisions. A brief summary of these enhancements follows: • General improvements to Bottleneck Detection on both 4Gb and 8Gb platforms, including improved accuracy on reporting latency and reporting of latency values in Bottleneck Detection events. • A new option to configure the switch "edge hold time," allowing the switch to timeout frames for F_Ports sooner than for E_Ports. Proper use of this capability (disabled by default) reduces the likelihood of devices with high latencies causing frame drops in the core of the fabric and impacting other unrelated flows. Details on usage and recommended settings will be available in separate documentation. • Support for Class 3 frame transmit (Tx) timeout discard counters on 4Gb platforms (previously, 4Gb platforms supported only receive (Rx) timeout counters. See the Fabric Watch Administrator's Guide for details on use and configuration). The bottleneck detection feature does not need an additional license and is available on all 4Gb and 8Gb capable platforms. Enhanced traffic isolation zones support Several enhancements were made to the TI zone functionality in Fabric OS 6.4.0. Though these enhancements are mainly targeted for FICON environments, they can be used in both FICON and Open Systems environments. These changes include: • Allow same device ports to be part of multiple TI zones with failover disabled or failover enabled. • Allow devices in a failover disabled TI zone to communicate with local devices (devices attached to the same switch) that are not part of the same TI zone. • Ensure that Domain Controller connectivity between switches in a fabric is not affected by TI zone policies. Lossless DLS enhancements • Lossless DLS enables Dynamic Load Sharing for optimal utilization of the ISLs without causing any frame loss. Note that "No frame loss" can be guaranteed only when a new additional path is used to do load rebalance. "No frame loss" cannot be guaranteed on an existing data path that encounters failure. • Fabric OS 6.4.0 added support for the Lossless DLS with DPS (Exchange based routing). The In Order Delivery (IOD) capability can be enabled optionally for both Port Based Routing and Exchange Based Routing policies. In pre-Fabric OS 6.4.0, the Lossless DLS feature was supported only for Port Based Routing and IOD was always enabled. Access Gateway enhancements The following enhancements were made to the Access Gateway functionality in Fabric OS 6.4.0: HP StorageWorks Fabric OS 6.4.0c Release Notes 7

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Bottleneck Detection enhancements
Fabric OS 6.4.0 enhanced bottleneck detection capability by adding support for congestion detection
at E, Ex, and F ports. Bottleneck monitoring configuration was greatly simplified in Fabric OS 6.4.0
by allowing switch-level enablement of this feature for both latency and congestion bottleneck
monitoring. New enhancements allow users to configure separate thresholds for detecting latency
bottleneck and congestion bottleneck conditions. Bottleneck monitoring alerts can be configured on
a per port basis and are delivered through SNMP traps and RAS logs.
Fabric OS 6.3.1b introduced several changes and enhancements that are also included in Fabric OS
6.4. These changes are not fully documented in existing administrator guides or other materials but
will be captured in future documentation and existing documentation updates and revisions. A brief
summary of these enhancements follows:
•
General improvements to Bottleneck Detection on both 4Gb and 8Gb platforms, including improved
accuracy on reporting latency and reporting of latency values in Bottleneck Detection events.
•
A new option to configure the switch
“
edge hold time,
”
allowing the switch to timeout frames for
F_Ports sooner than for E_Ports. Proper use of this capability (disabled by default) reduces the
likelihood of devices with high latencies causing frame drops in the core of the fabric and impacting
other unrelated flows. Details on usage and recommended settings will be available in separate
documentation.
•
Support for Class 3 frame transmit (Tx) timeout discard counters on 4Gb platforms (previously,
4Gb platforms supported only receive (Rx) timeout counters. See the
Fabric Watch Administrator
’
s
Guide
for details on use and configuration).
The bottleneck detection feature does not need an additional license and is available on all 4Gb and
8Gb capable platforms.
Enhanced traffic isolation zones support
Several enhancements were made to the TI zone functionality in Fabric OS 6.4.0. Though these
enhancements are mainly targeted for FICON environments, they can be used in both FICON and
Open Systems environments. These changes include:
•
Allow same device ports to be part of multiple TI zones with failover disabled or failover enabled.
•
Allow devices in a failover disabled TI zone to communicate with local devices (devices attached
to the same switch) that are not part of the same TI zone.
•
Ensure that Domain Controller connectivity between switches in a fabric is not affected by TI zone
policies.
Lossless DLS enhancements
•
Lossless DLS enables Dynamic Load Sharing for optimal utilization of the ISLs without causing any
frame loss. Note that
“
No frame loss
”
can be guaranteed only when a new additional path is
used to do load rebalance.
“
No frame loss
”
cannot be guaranteed on an existing data path that
encounters failure.
•
Fabric OS 6.4.0 added support for the Lossless DLS with DPS (Exchange based routing). The In
Order Delivery (IOD) capability can be enabled optionally for both Port Based Routing and Ex-
change Based Routing policies. In pre-Fabric OS 6.4.0, the Lossless DLS feature was supported
only for Port Based Routing and IOD was always enabled.
Access Gateway enhancements
The following enhancements were made to the Access Gateway functionality in Fabric OS 6.4.0:
HP StorageWorks Fabric OS 6.4.0c Release Notes
7