What is All path down & permanent device loss? How to troubleshoot or which log to check for the event/ sense code?

Question

Accepted Answer

All path down is a condition where all paths to a storage device become unavailable. Permanent device loss refers to a situation where a storage device is permanently inaccessible.

All path down occurs when all paths to a storage device fail, resulting in loss of connectivity.
Permanent device loss happens when a storage device becomes permanently inaccessible due to hardware failure or other issues.
To troubleshoot all path down, check the host logs for any error messages related to storage connectivity.
To troubleshoot permanent device loss, check the storage array logs for any error messages or sense codes indicating the loss of the device.
For all path down, check the vmkernel.log, hostd.log, and vobd.log files for any relevant information.
For permanent device loss, check the storage array logs or event viewer for any error messages or sense codes indicating the loss of the device.

Accepted Answer

Due to the nature of an APD situation, there is no clean way to recover.

The APD situation needs to be resolved at the storage array/fabric layer to restore connectivity to the host.
All affected ESXi hosts may require a reboot to remove any residual references to the affected devices that are in an APD state.
To resolve this issue, identify the cause of the disconnected LUNs by reviewing the environment, such as Storage array, SAN switch, Device failure, etc.

If the virtual machines on the datastores remain responsive, you can power off the virtual machines or migrate them to a different datastore or host.

What is All path down & permanent device loss? How to troubleshoot or which log to check for the event/ sense code?

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What is All path down &amp; permanent device loss? How to troubleshoot or which log to check for the event/ sense code?

Top Rackspace Vmware Administrator interview questions & answers

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What is All path down & permanent device loss? How to troubleshoot or which log to check for the event/ sense code?