IBM System z10 EC Reference Manual

Also see for System z10 EC: Reference guide

Contents

24OSA-Express2 OSN (OSA for NCP)The OSA-Express2 OSN (OSA for NCP) can help to elimi-nate the requirement to have any form of external medium,and all related hardware, for communications between thehost operating system and the CCL image. Traffic betweenthe two images (operating system and CCL) is no longerrequired to flow on an external Local Area Network (LAN)or ESCON channel.CHPID type OSN supports both SNA PU Type 5 and PUType 2.1 channel connectivity.Utilizing existing SNA support (multiple transmissiongroups), OSA-Express2 OSN support permits multipleconnections between the same CCL image and the samehost operating system image. It also allows multiple CCLimages to communicate with multiple operating systemimages, supporting up to 180 connections (3745/3746unit addresses) per CHPID type OSN. CHPID type OSNcan also span LCSSs. The CCL image connects to theOSA-Express2 feature using QDIO architecture and usesthe Linux QDIO (qeth) support updated to support OSNdevice types.OSA-Express2 OSN (OSA for NCP) support is exclusive toSystem z10 EC and System z9.OSA-Express2 concurrent LIC update – an availabilityenhancementThe OSA-Express2 features have increased memoryin comparison to the OSA-Express features and aredesigned to be able to facilitate concurrent application ofLicensed Internal Code (LIC) updates, allowing the appli-cation of LIC updates without requiring a configurationoff/on of the features. This can help minimize the disruptionto network traffic during the update.OSA-Express2 concurrent LIC update applies to CHPIDtype OSD and is exclusive to the System z10 EC, Systemz9, and z990.OSA Integrated Console ControllerThe Open Systems Adapter Integrated Console Control-ler function (OSA-ICC), which is exclusive to the Systemz10 EC, System z9 and z990 servers since it is based onthe OSA-Express2 and OSA-Express 1000BASE-T Ether-net features, supports the attachment of non-SNA 3270terminals for operator console applications. Now, 3270emulation for console session connections (TN3270E [RFC2355] or non-SNA DFT 3270 emulation) is integrated in theSystem z platforms which can help eliminate the require-ment for external console controllers (2074, 3174), helpingto reduce cost and complexity.The OSA-ICC can be individually configured on a port-by-port basis. The OSA-ICC is enabled using CHPID typeOSC. The OSA-ICC supports up to 120 client console ses-sions per port either locally or remotely.Support for this function is provided with z/OS, z/VM,z/VSE, and TPF.OSA EnhancementsRemove L2/L3 LPAR-to-LPAR RestrictionOSA port sharing between virtual switches can communi-cate whether the transport mode is the same (Layer 2 toLayer 2) or different (Layer 2 to Layer 3). This enhance-ment is designed to allow seamless mixing of Layer 2 andLayer 3 traffic, helping to reduce the total cost of network-ing. Previously, Layer 2 and Layer 3 TCP/IP connectionsthrough the same OSA port (CHPID) were unable to com-municate with each other LPAR-to-LPAR using the MultipleImage Facility (MIF).This enhancement is designed to facilitate a migrationfrom Layer 3 to Layer 2 and to continue to allow LANadministrators to configure and manage their mainframenetwork topology using the same techniques as their non-mainframe topology.