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Immortal

Most probable offset for I/O errors VMFS 6 : 20mb - Coincidence ?

A VMFS volume that reports I/O errors can still be usable - if the I/O errors is located in unused areas of the volume.

If the errors occurs in the first 1200 gbs the volume will very likely be unreadable with ESXi itself.

I just noticed that I/O errors that lock a volume occur surprisingly often at 20 MB into the disk. Thats where the Heartbeat-section of 4 MB starts.

Coincidence ? - dont think so ...

Diagnosis:

dd if=/dev/disks/partition bs=1M count=2048 of=headerdump.2048

reports error and location/offset

Suggested Cure:

dont waste time with trying to fix I/O errors when they occur in metadata range - ESXi does not have the tools to continue - switch to Linux

dump partition and extract data from image

important: reduce errorsize during dump

Ulli


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Do you need support with a VMFS recovery problem ? - send a message via skype "sanbarrow"
I do not support Workstation 16 at this time ...

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