NTSTATUS 0xC03A0009 (STATUS_VHD_BLOCK_ALLOCATION

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: the virtual-disk provider could not allocate a new backing block for a write.

Could be also:
Constant	Type	OS
ERROR_VHD_BLOCK_ALLOCATION_FAILURE	HRESULT	Windows

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STATUS_VHD_SPARSE_HEADER_CORRUPT	STATUS_VHD_BLOCK_ALLOCATION_TABLE_CORRUPT

STATUS_VHD_BLOCK_ALLOCATION_FAILURE

STATUS_VHD_BLOCK_ALLOCATION_FAILURE occurs when a dynamic or differencing virtual disk needs a new backing block and the provider cannot allocate it. The failure is about extending the container mapping for a virtual write, not merely about free sectors reported by the guest operating system.

This differs from STATUS_VHD_BLOCK_ALLOCATION_TABLE_CORRUPT, where the existing mapping table cannot be trusted. It also differs from STATUS_VHD_METADATA_FULL: payload-block allocation and the capacity reserved for VHDX metadata are different resources.

Check the write path, not only guest free space

Record host filesystem free space, quotas, storage errors and the virtual-disk file growth at the time of the write.
Determine whether the disk is dynamic or differencing; a differencing child can grow even when the parent is unchanged.
Do not compact, merge or resize an image that has unverified allocation failures until an offline copy is available.

References

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