The contest z/OS is a virtual machine controlled by a single LPAR running z/VM
IBM Z is computer hardware, the mainframe
- z/OS - flagship operating system used for this contest
- Linux - if you know Linux, you know Linux that runs on IBM Z
- z/VM - hypervisor operating system
- z/TPF - Transaction Processing Facility
- z/VSE - similar to z/OS with less features and functions
IBM Z Operating Systems
IBM Z supports 2 types of hypervisors:
- LPAR - Logical Partition, a type 1 hypervisor
- z/VM - z/Virtual Machine, a type 2 hypervisor
Types of Hypervisors
IBM Z unparalleled server capability
- LPAR hardware hypervisor is assigned CPU's, Memory, and Peripheral Devices such as disk, network, tape, etc, from the total available resource pool.
- Any of the 5 operating systems can run in an LPAR.
- A single IBM Z is capable or running up to 85 LPARs.
- z/VM is a software hypervisor.
- Any of the 5 operating systems can be a guest virtual machine within the z/VM environment.
- It is common to use z/VM hypervisor to run 100's and even 1000's of Linux operating systems.
- Communication between the operating systems in the IBM Z frame eliminates the requirement for extra cables and the response time between operating systems is near zero.
- Running 8,000+ operating systems within a single IBM Z frame with network delay between the operating systems near zero is industrial strength architecture.
Information about the contest IBM Z mainframe
While previous years' contests exposed contestants to other IBM Z operating systems, 2018 contest is all z/OS. However, the contest z/OS is running as virtual machine under z/VM where the z/VM is running in one of several LPARs on the contest IBM Z hardwere - contest system is using a very small fraction of the IBM Z frame.
As a result of the contest z/OS running as a virtual machine under z/VM, it is possible to 'query' z/VM from z/OS.If you want free access to Linux running on IBM Z:
Start your trial now
z/VM query command output in preparation for challenge
- q cplevel
z/VM Operating System Level hosting the contest z/OS virtual machine
- q n
Number of virtual machines currently active as guests of z/VM
- q nic
Network Interface Controller
Observe the NIC Adapter device number (400) and the NIC Adapter Name
Write down the NIC Adapter Name - you will need it to complete challenge
The NIC adapter device number is the first of three z/VM device addresses used to
communicate with z/OS virtual machine
- q 400-402
z/VM defined NIC Adapter Devices 400 to 402
Gather z/OS system definitions used to communicate with z/VM hypervisor
- z/VM NIC adapter device addresses 400-402 are used to communicate with z/OS
- z/VM NIC adapter name is known - you were asked to write it down previously
- View 'v' vendor.tcpparms partitioned data set
- Select 's' member name S0W1
The data is the z/OS TCPIP definitions which includes the z/OS HOME IP address and NIC adapter name
No worries - any attempt to save changes will fail due to read-only authority
- Delete all lines except the 3 lines with the NIC adapter name
- After 'a' the third and last line, enter ISPF edit primary command
You are looking at additional z/OS definitions used to establish connection with z/VM
- Type ISPF line command c99 over top of the first line number
and enter ISPF primary command
rep p3.output(#12) to copy all lines to p3.output(#12)
- Enter ISPF edit primary command cancel to exit view session.
If done correctly, p3.output(#12) has 7 lines consisting of z/OS definitions used to connect to z/VM.
Great progress! Only 3 more challenges to be a candidate for winner or honorable mention status.