A vSphere operator finds this error message: Device or filesystem with identifier [naa.1234567890] has entered the All Paths Down state. What should the operator conclude from this error message?
A.
A host failed, and automated recovery of affected VMs is expected.
B.
A storage device is inaccessible and is expected to become available.
C.
A host is inaccessible, and migration of affected VMs is expected.
D.
A storage device has failed and is not expected to become available.
The error message "Device or filesystem with identifier [naa.1234567890] has entered the All Paths Down state" indicates that:
B. A storage device is inaccessible and is expected to become available.
This error message typically means that the storage device associated with the specified identifier (in this case, identified by the NAA - Network Address Authority) has lost connectivity or become inaccessible from the perspective of the ESXi host. The "All Paths Down" state suggests that all paths from the host to the storage device are unavailable or disconnected.
In such cases, the expected scenario is that the storage device might be temporarily unavailable or experiencing issues, and there's an anticipation or hope that it will regain connectivity or become available again, allowing access to the storage resources once the issue is resolved.
All-Paths-Down (APD) situation occurs when all paths to a device are down. As there is no indication of whether this is a permanent or temporary device loss, the ESXi host keeps reattempting to establish connectivity. APD-style situations commonly occur when the LUN is incorrectly un-presented from the ESXi host.
Could be C or B
https://kb.vmware.com/s/article/2032934
" In contrast with the permanent device loss (PDL) state, the host treats the APD state as transient and expects the device to be available again."
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