To obtain kernel dumps of Linux® on IBM® Z instances, you can
use the tools described, for example, kdump or VMDUMP. You can use DASD, tape, or SCSI dump
devices.
Updates for kernel 6.3 - 6.6 Linux kernels 6.3 - 6.6.PDF file for Using the Dump Tools on Kernel 6.6 Planning for dumps Using kdump system dumps for instances of Linux on IBM Z .Using a DASD dump device stand-alone CCW DASD dump tool and perform the dump process. Then, copy the dump to a file in a Linux file system.Using DASD devices for multi-volume dump Using an ECKD DASD partition for list-directed dump Using a tape dump device channel-attached tape as a dump device. To use a tape, you need to install the stand-alone tape dump tool and perform the dump process. Then, copy the dump to a file in a Linux file system.Using a SCSI disk dump device stand-alone SCSI dump tool, perform the dump process, and copy the dump to a file in a Linux file system.Using an NVMe disk dump device Linux file system.Using VMDUMP z/VM® systems, using the z/VM reader as the dump medium.Using virsh dump to create dumps on KVM hosts virsh dump command writes KVM guest dumps to a file in the KVM host file system.Creating live-system dumps with zgetdump Processing dumps Obtaining a dump with limited size mem kernel parameter can make Linux use less memory than is available to it. A dump of a Linux system like this does not need to include the unused memory. You can use the zipl size option to limit the amount of memory that is dumped.Command summary