Frame Redirection; Adaptive Networking/Flow-Based Qos Prioritization - HP StorageWorks 8/8 - SAN Switch Release Note

Licensing behavior
When operating a switch with Fabric OS 6.2.x, some licenses may be displayed as Unknown. This
is due to changes in licensing requirements for some features that no longer require a license key and
may still be installed on a switch.

Frame Redirection

In Fabric OS 6.2.x, Frame Redirection zoning is not allowed with Default Zoning (all access in
IM0 and default zone in IM2). This was allowed in previous releases. There is no software enforcement
to block the upgrade.

Adaptive networking/flow-based QoS prioritization

When using QoS in a fabric with 4-Gb ports or switches, Fabric OS 6.0 or later must be installed
on all products in order to pass QoS info. E_Ports from the HP StorageWorks DC SAN Backbone
Director or HP StorageWorks DC04 SAN Director to other switches must come up after 6.0 is
running on those switches.
Flow-based QoS is not supported on FC8 blades in the HP StorageWorks 4/256 SAN Director
Any products that are not capable of operating with Fabric OS 6.0 cannot exist in a fabric with
Flow-based QoS. Major problems occur if previous generation 2G products exist in the fabric.
For the HP StorageWorks SAN Switch 4/32 and SAN Switch 4/32B, if all of the ports are E_Ports
and the switch is upgraded to Fabric OS 6.2.x, the buffers on the E_Ports are changed to utilize
the QoS model. If the switch is rebooted, 28 of 32 ports will come up in QoS mode; the last four
ports will come up in buffer-limited mode. Workarounds include disabling long distance configur-
ation for these ports or explicitly disabling QoS on other ports, freeing up buffers for the last four
ports.
This release revises the default behavior of the Adaptive Networking QoS feature:
The default QoS behavior changed to disabled on 4-Gb platforms.
The default QoS behavior changed to disabled on the Extended Fabrics E-ports on both 4-Gb and
8-Gb platforms.
This resolves the following unexpected behaviors that occurred when the Adaptive Networking QoS
feature was enabled by default in the previous FOS releases:
The splitting of a single trunk group into multiple trunk groups upon port toggle, since the toggled
ports come online with QoS enabled while the remaining ports in the trunk group have QoS dis-
abled.
Fewer buffer credits made available to normal E-ports after a port toggle, even when QoS is not
being utilized.
Unexpected change to fill word configuration on an Extended Fabrics E-port after a port toggle.
If an Extended Fabrics E-port originally used IDLE primitives as fill words, and if that port toggles,
the fill word configuration changed to use ARB primitives.
NOTE:
After upgrading to this firmware release, if users want to enable the Adaptive Networking QoS feature
on 4-Gb platforms and on Extended Fabrics E-ports on both 4-Gb and 8-Gb platforms, they must do
so explicitly through the available user interfaces.
HP StorageWorks Fabric OS 6.2.0g release notes 23