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STATUS_VOLMGR_UNEXPECTED_DISK_LAYOUT_CHANGE
STATUS_VOLMGR_UNEXPECTED_DISK_LAYOUT_CHANGE is a concurrency and freshness warning. Volume Manager began an operation against one view of the disk, then detected that the layout had changed outside its control before the operation completed.
Repeating the same request against cached state is unsafe. The change may come from another administrator, an installer, a storage-management agent, a hypervisor, a restore workflow, or a device path that was rescanned underneath the operation.
What to do next
- Stop competing disk-management actions and acquire a fresh layout from the target physical disk.
- Compare the old and current partition/extent maps to identify the external change before retrying.
- Use stable disk identities in automation and record the layout version or signature used to prepare a change.
Microsoft: DRIVE_LAYOUT_INFORMATION_EX
Microsoft: IOCTL_DISK_SET_DRIVE_LAYOUT_EX
Microsoft: Volume Manager error codes
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