Special tools

Tools for special circumstances that can be used when debugging Linux® on IBM® Z and IBM LinuxONE problems.

s390dbf traces - Use the kernel debug feature
All device drivers and other kernel components write debug log records. These records are available after a system crash. You can read and save them on a running system. After a system crash these records are only available in the dump. A restart clears s390dbf traces.
scsi_logging_level - Use the SCSI logging feature
Use the scsi_logging_level command to create, set, or get the SCSI logging level.
top - See resource usage
The top command provides a dynamic, real-time view of a running system and shows resource usage on a thread level. It can show, for example, CPU usage and detailed memory usage.
hyptop - Display hypervisor performance data
Use the hyptop command to obtain a dynamic real-time view of a hypervisor environment on IBM Z.
ps - Report a snapshot of the current processes
The ps command gives comprehensive statistics data on process level and reports a snapshot of the current processes.
netstat - Show information about the Linux networking subsystem
The netstat command shows information about the Linux networking subsystem.
ss - Display sockets statistics
Use the ss command to analyze the sockets that run on a Linux system.
Collecting data using QETH statistics
You can use the qeth_perf function to collect performance statistics for a specific QETH device.
tcpdump - Collect traffic information for a network interface
The tcpdump network analysis tool dumps traffic collected for a given network interface.

Parent topic: Tools for troubleshooting