Hi.
I am using verion 7.0b vsan cluster.
one capacity disk failure has occurred in the environment, and the host has entered PSoD state.
In this regard, checked the KB below
https://kb.vmware.com/s/article/71207
However, there are areas that I don't understand.
PSoD may not occur in every situation where a disk failure occurs. Is there a criterion for PSoD to occur?
Additionally, I am curious about th meaning of 'wedged i/o or lost i/o'.
thank you for your guidance. 🙂
@vulpineox PSODs don't occur for the vast vast majority of disk failures, likely far less than 1% judging by how rarely we see cases relating to this GSS vs 'normal' failed disks - additionally, the vast majority of the times we see PSODs there is some unsupported element (e.g. controller/disk not on the vSAN HCL or not using driver/firmware listed on this).
As the kb says, this only occurs in scenarios where the disk or the controller managing it is non-responsive to more graceful attempts of unmounting the device or marking it as PDL for what in storage terms is a very long time (120 seconds). 'Wedged' or 'lost' IOs are those that have been transmitted to the end-device but no acknowledgement of them being received/committed is returned.
@vulpineox PSODs don't occur for the vast vast majority of disk failures, likely far less than 1% judging by how rarely we see cases relating to this GSS vs 'normal' failed disks - additionally, the vast majority of the times we see PSODs there is some unsupported element (e.g. controller/disk not on the vSAN HCL or not using driver/firmware listed on this).
As the kb says, this only occurs in scenarios where the disk or the controller managing it is non-responsive to more graceful attempts of unmounting the device or marking it as PDL for what in storage terms is a very long time (120 seconds). 'Wedged' or 'lost' IOs are those that have been transmitted to the end-device but no acknowledgement of them being received/committed is returned.
Thank you for your detailed and kind answer. Have a good time. 🙂