Networking

LPAR mode z/VM guest KVM guest

Ubuntu Server 20.04.1 includes several network device drivers that are specific to z/Architecture®.

For information about high-performing, secure networking and connectivity, see
www.ibm.com/it-infrastructure/z/capabilities/networking

Restrictions

For prerequisites and restrictions see the IBM® LinuxONE and IBM Z® architecture-specific information in the Ubuntu Server 20.04.1 release notes at
wiki.ubuntu.com/FocalFossa/ReleaseNotes

Example

Figure 1. Networking example
This graphic is described in the text that follows

In the example there are three Linux® instances; two of them run as z/VM® guests in one LPAR and a third Linux instance runs in another LPAR. Within z/VM, Linux instances can be connected through a guest LAN or VSWITCH. Within and between LPARs, you can connect Linux instances through HiperSockets. OSA-Express cards running in either non-QDIO mode (called LCS here) or in QDIO mode can connect the mainframe to an external network.

Table 1 lists which control units and device type combinations are supported by the network device drivers.

Table 1. Supported device types, control units, and corresponding device drivers. A list of supported device types, control units, and corresponding device drivers
Device type Control unit Device driver Comment
1732/01 1731/01 qeth OSA configured as OSD
1732/02 1731/02 qeth OSA configured as OSX
1732/05 1731/05 qeth HiperSockets
0000/00 3088/1f lcs 2216 Nways Multiaccess Connector
0000/00 3088/60 lcs OSA configured as OSE (non-QDIO)