We will again start with the logging files as we we did in the previous chapters. The log files always provide a distinctive and systematized way of beginning troubleshooting. For storage issues, the most important vSphere host log files are hostd.log, storageRM.log, and vmkernel.log. We briefly reviewed vSphere hosts and vCenter Server log files in Chapter 1, The Methodology of Problem Solving.
The hostd.log files contain the logs of virtual machines, different events and tasks of vSphere hosts, vpxa agent, vCenter Server, and vSphere client logs. Logs related to SDK connections are also logged in these files.
Storage I/O Control (SIOC) related problems are logged into /var/log/storagerm.log. You can check this file if SIOC is not working normally or I/O prioritization is not working for virtual machines, as expected in bottlenecks or otherwise. Sometimes you see a message stating Storage I/O control: connection with vobd failed in...