Troubleshooting paths
LUNs masking can be used to troubleshoot a storage device. To troubleshoot, you can disable storage paths temporarily for a particular vSphere host. This can save you a lot of time during troubleshooting of storage issues.
A vSphere host can declare two states about a storage device loss: All Paths Down (APD) or Permanent Device Loss (PDL). An APD signal is triggered when a storage device loses communication with a vSphere host. In this case, a vSphere host believes that the path will be restored shortly and the storage device will be reconnected.
A PDL signal is triggered once a vSphere host identifies that the I/O cannot be queued for the storage device anymore. Once the device is declared to be in a state of permanent loss, ...
Get VMware vSphere Troubleshooting now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
