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ERROR_VID_PARTITION_NAME_TOO_LONG
ERROR_VID_PARTITION_NAME_TOO_LONG is HRESULT 0xC0370006 in the VID partition naming limit area of the Windows virtualization stack. The built-in message names the immediate result; the useful custom context is the exact boundary: the internal name assigned to a VID partition during creation or lookup. Record the first returning operation and host-side event before a management layer retries or translates it.
State and ownership model
The partition identifier exceeds the accepted limit after all prefixes, suffixes, or encoding conversions are applied. The visible VM name may be shorter than the final internal string.
Hyper-V architecture documentation identifies VID as the component that provides partition, virtual-processor, and memory-management services., many ERROR_VID_* values describe internal host objects rather than a public API that administrators should call directly. Accordingly, diagnose this result through the named object/state, the VMMS or Worker event chain, and the operation that produced it; do not invent a user-mode VID call from the constant name.
Neighboring result: INVALID_OBJECT_NAME covers malformed syntax; PARTITION_NAME_TOO_LONG isolates length. MESSAGE_QUEUE_NAME_TOO_LONG applies to a different object and may have a different generated prefix.
Capture before changing anything
| Evidence | Why it changes the diagnosis |
|---|---|
| Final internal name | Record UTF-16 length after formatting, not only the UI display name. |
| Name components | Keep VM ID, worker suffix, namespace prefix, and separators individually. |
| Boundary test | Capture last successful and first failing lengths through the same code path. |
| Persistence link | Record whether configuration stores the display name, GUID, or generated partition name. |
Preserve identifiers and counts without dumping guest secrets or unrelated memory. Useful this result timestamps include the last successful operation, first failure, any automatic retry, and the object-generation change that followed.
Reduce the case safely
- Use stable GUID-based identity rather than concatenating unbounded labels.
- Validate length after encoding and all generated decorations.
- Test rename, import, and clone paths for cumulative suffixes.
- Do not truncate identifiers if that can create collisions.
Test the smallest supported create, lookup, initialize, or resource request that preserves the named condition. In the result reproduction, change one count, identity, or lifecycle step at a time and capture the first host event before retry.
What comparison can tell you
Across these controls for it, preserve the internal name assigned to a VID partition during creation or lookup as the boundary under test.
| Control | Interpretation | Hold constant |
|---|---|---|
| Fresh owned object — this result | A clean lifecycle changing this result implicates duplicate initialization, leaked ownership, stale lookup, or incomplete rollback. | Preserve request flags and topology while changing only object generation. |
| Same request on a compatible host — it | If it follows one host, compare resource limits, topology, build, and inventory before altering VM data. | Use the same request and leave virtual disks unchanged in the result comparison. |
| One operation parameter — it | Change one count, name, identity, or state transition. If it moves, the selected boundary is causal rather than the VM as a whole. | Keep host build, VM ID, and returning operation fixed for it. |
Do not erase the evidence
A restart may release internal objects and make it disappear while erasing registration, ownership, resource-count, or teardown evidence. Capture the first result event chain before recovery.
Closure criteria
The corrected naming scheme remains unique and stays within the limit for create, import, restart, and migration scenarios. Repeat the original operation under the original supported conditions and retain one deliberate negative control. A management command succeeding on a different object is not sufficient to close this incident.
Technical references
These sources define it and the public Hyper-V architecture surrounding the internal state. They do not create a public user-mode VID API for the named object.
- Microsoft Open Specifications: HRESULT values — used to interpret the boundary.
- Microsoft: Hyper-V architecture — used to interpret the boundary.
- Microsoft: Hyper-V TLFS — used to interpret the boundary.
- Microsoft: Hyper-V operational troubleshooting — used to interpret the boundary.
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