Skip to main content

IBM Systems  >   z Systems  >   z/VM  >  

Description of SELFLGR

Download count: 16 this month, 1251 altogether.

Downloads for SELFLGR:
VMARC archive: v-11K

SELFLGR gives you the ability to relocate your connected VM session from one member of a Single System Image (SSI) to another member. If you are working on member SSIA, for example, and suddenly decide you want to be on member SSIB, you type

                                                                           
                                                                                
         ?LGR SSIB                                                              
                                                                                
sit back and watch a few seconds while your terminal emulator screen blinks a bit, and then you are logged on, connected, to SSIB. Of course, the UserID you are logged on to must be eligible for relocation, other than the fact that it is not disconnected.

As configured for this package, SELFLGR consists of an IDENTITY user SELFLGR, which must be logged on to every SSI member you may wish to relocate from, and a few REXX programs. (User SELFLGR does not need to be logged on the system you are relocating to, but in that case you will not be able to use the tool to get back to where you started.) It also requires availability of MPVM, a component of the PVM product. It would be possible and reasonably straightforward to replace the MPVM requirement with use of a macro associated with your favorite terminal emulator: you need only replace the function of the LGR MPVM program.

Little set up is required. You need to create the SELFLGR UserID (a model directory entry is included in the README file), populate its A disk with the required EXECs, get it logged on, and ensure that the MPVM NAMES and LGR MPVM files are available at the location you will access MPVM from. Typically, these will reside on your A disk on some UserID on some system outside the SSI. You must modify MPVM NAMES to include the SSI members you plan to use.

The essential files in this package are

  • MPVM NAMES -- A sample MPVM NAMES file
  • PROFILE SELFLGR -- PROFILE EXEC for UserID SELFLGR
  • LGR MPVM -- Program to start the tasks required to relocate
  • LGRME EXEC -- Program to talk to the SELFLGR server
  • CONNREL EXEC -- Program run by the SELFLGR server
  • SELFLGR README -- Directions for set up and use

See SELFLGR README for more detailed instructions.

Some comments about security: While this tool was written with security in mind (there are no passwords flying back and forth, for example), its genesis was software testing, on systems where security is not so important as on production systems. Except by the author Tim Greer, no review has been done.