HP 4400 Release Note page 21

Other important notes and recommendations
This section contains additional information that you should consider before you use this Fabric
OS release.
Virtual Fabrics
On VF-capable platforms, the VF feature must be enabled after upgrading to Fabric OS 6.2.x
in order to utilize the related capabilities, including Logical Switches and Logical Fabrics.
When creating Logical Fabrics that include switches that are not VF-capable, it is possible to
have two Logical Switches with different FIDs in the same fabric. Be sure to verify that the FIDs
match for all switches in the same Logical Fabric.
The aptpolicy can be configured per logical switch. The Administrator Guide indicates it is a
chassis-level setting.
In order to support nondisruptive Hot Code Load on an HP StorageWorks 8/40 SAN Switch
with VF enabled, the total zoning DB size for the entire chassis should not exceed 1 MB.
A switch with VF enabled cannot use Port Mirroring or participate in a fabric that uses IP filter
or password database distribution or administrative domains. You must disable the VF feature
before deploying it in a fabric that uses these features.
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
The following restriction in Fabric OS 6.2.0x has been removed for Fabric OS 6.2.1 and later.
In Fabric OS 6.2.0, Frame Redirection zoning is not allowed with Default Zoning (all access
in IM 0 and default zone in IM 2). 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-G 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 any 8-Gb FC 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 2-Gb 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
Other important notes and recommendations 21