Creating and reading a guest memory dump

Red Hat Enterprise Linux 9.2 z/VM guest

You can use the vmur command to read a guest memory dump that was created, for example, with the vmcp command.

Procedure

  1. Produce a memory dump of the z/VM® guest virtual machine memory: 
    # vmcp vmdump
    Depending on the memory size this command might take some time to complete.
  2. List the spool files for the reader to find the spool ID of the dump file, VMDUMP.
    In the example, the spool ID of VMDUMP is 463. 
    # vmur li

ORIGINID FILE CLASS RECORDS  CPY HOLD DATE  TIME     NAME   TYPE DIST
T6360025 0463 V DMP 00020222 001 NONE 06/11 15:07:42 VMDUMP FILE T6360025
  3. Read and convert the VMDUMP spool file to a file in the current working directory of the Linux® file system: 
    # vmur rec 463 -c linux_dump