24.2 An example of server consolidation based on Linux

Figure 24-2 shows an example of a consolidated server environment that is based on Linux. There are two mainframes: A and B. Mainframe A is an IBM zSeries 900 machine, in which z/VM runs in an LPAR.

  • z/VM is required to manage the three VM guests, one is used to run Linux for zSeries, a second is used to run Linux for S/390, and a third is used to run TCP/IP. The Linux for S/390 guest acts as a router for routing information between the internal network that connects the three z/VM guests and the external Ethernet LAN.

  • The Linux guests and TCP/IP guest are connected by means of virtual HiperSockets, ensuring fast and efficient communication among these guests.

  • The z/OS and Linux for zSeries that run in LPARs communicate with each other via a hardware HiperSockets function. They can also communicate with each of the Linux guests of Mainframe A through the OSA-Express adapter and the Linux for S/390 guest.

  • The OSA-Express adapter, which uses a high-speed I/O protocol called Queued Direct Input/Output (QDIO), enables communication to take place between the 1-Gigabit Ethernet LAN and the:

    - Linux for zSeries operating system running in an LPAR of Mainframe A.

    - z/OS operating system running in an LPAR of Mainframe A.

    - Linux guests of Mainframe A, through the Linux for S/390 guest.

Mainframe B represents a technology that is slightly older than that of Mainframe A. It is either an IBM 9672 G5 or G6 computer, where z/VM runs in native mode.

  • z/VM manages the five VM guests, each of which is used to run a Linux for zSeries operating system.

  • The VM guests are connected by means of virtual CTC connectors.

  • The Linux guest called Linux for zSeries (3) acts as a router between the Gigabit Ethernet LAN and the Token-Ring network.

  • Any of Mainframe A's Linux systems, or Mainframe B's Linux systems, can communicate with the Token-Ring through Mainframe B's:

    1. OSA-Express adapter

    2. Linux for zSeries (3) router

    3. OSA-2 adapter

    This assumes, of course, that the routing table of the TCIP/IP guest in Mainframe A contains an appropriate routing entry.

In the "real world," however, companies might configure their mainframe to have a hundred or more Linux guests and LPARS, used for running a wide range of applications. Such configurations are considerably more complex than that shown in Figure 24-2.

Linux on the Mainframe
Linux on the Mainframe
ISBN: 0131014153
EAN: 2147483647
Year: 2005
Pages: 199

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