HP Cisco MDS 8/24c Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Rel - Page 25

New Features in Cisco MDS NX-OS Release 5.0(4) Send documentation comments to [email protected] New Features in Cisco MDS NX-OS Release 5.0(4) Cisco MDS NX-OS Release 5.0(4) is a maintenance release. It includes bug fixes and the following new feature: • Slow Drain Device Detection and Congestion Avoidance The slow drain feature provides various enhancements to detect slow drain devices that cause congestion in the network and lead to an ISL credit shortage in the traffic destined for these devices. The credit shortage affects the unrelated flows in the fabric that use the same ISL link even though destination devices do not experience slow drain. The slow drain feature also includes a congestion avoidance function. The slow drain feature is not supported on the following Cisco MDS 9000 Family hardware: - The Supervisor-1 module - Generation 1 switching modules - The MDS 9216 switch, MDS 9216i switch, MDS 9120 switch, and the MDS 9140 switch Documentation for this feature is available in the "Configuring Interfaces" section of the Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide. NX-OS Feature Descriptions This section includes descriptions of the major new features of MDS NX-OS Release 5.0(4) and indicates where the feature is documented. Discontinued Software Features As of NX-OS Release 5.0(1a), support for Fabric Congestion Control (FCC) is discontinued. If you are currently using FCC in your SAN environment, you should turn it off before upgrading to NX-OS Release 5.0(1a) or later. Use the no fcc enable command to turn off the FCC feature. Hardware Changes There are no hardware changes associated with NX-OS Release 5.0(4). Licensed Cisco NX-OS Software Packages Most Cisco MDS 9000 family software features are included in the standard package. However, some features are logically grouped into add-on packages that must be licensed separately, such as the Cisco MDS 9000 Enterprise package, SAN Extension over IP package, Mainframe package, Fabric Manager Server (FMS) package, Storage Services Enabler (SSE) package, Storage Media Encryption package, and Data Mobility Manager package. On-demand ports activation licenses are also available for the Cisco MDS Blade Switch Series and 4-Gbps Cisco MDS 9100 Series Multilayer Fabric switches. OL-21012-02 Cisco MDS 9000 Family Release Notes for Cisco MDS NX-OS Release 5.0(4) 25