Symptoms
Cannot force to mount a LUN with command esxcli storage vmfs snapshot mount -u VMFS_UUID on the ESXi hostForcing to mount a LUN with command esxcli storage vmfs snapshot mount -u VMFS_UUID on the ESXi host failsYou see the error:
VMFS UUID/label: 5419946d-5e388324-04a4-020eb66da988/LUN01Can mount: No (duplicate extents found)Can resignature: No (duplicate extents found)Extent name: eui.00255c3a2285016e:1 range: 0 - 547583 (MB)Extent name: eui.00255c3a2285001a:1 range: 0 - 547583 (MB)
Any attempt to re-signature via the Add Storage wizard indicates of a complete format of the affected LUN
Cause
This issue occurs when two different LUNS with their own unique NAA ID and have the same VMFS signature.
For example:
VMFS UUID/label: 5419946d-5e388324-04a4-020eb66da988/LUN01Can mount: No (duplicate extents found)Can resignature: No (duplicate extents found)Extent name: eui.00255c3a2285016e:1 range: 0 - 547583 (MB)Extent name: eui.00255c3a2285001a:1 range: 0 - 547583 (MB)
Note:
eui.00255c3a2285001a was the original LUN
eui.00255c3a2285016e was the snapshot LUN
Resolution
To resolve this issue, perform these steps.
Un-present one of the affected LUNs from the ESXi host. For more information, see Unmounting a LUN or detaching a datastore/storage device from multiple VMware ESXi 5.x hosts (2004605).Rescan all HBAs as required.Attempt to re-signature the other affected LUN. For more information, see vSphere handling of LUNs detected as snapshot LUNs (1011387).Present the other affected LUN on the same ESXi host. Confirm that this LUN is visible in the Storage Adapters device list. Rescan all HBAs as required.Attempt to re-signature the other affected LUN.
If the issue persists:
Collect VMware Support information.File a support request with VMware Support and quote this Knowledge Base article ID (2098762) in the problem description. For more information, see Filing a Support Request in Customer Connect (2006985).
Related Information
ESXi 5.x ホストで LUN の強制マウントに失敗し、次のエラーが表示される： duplicate extents found
