leo79901 opened a new issue, #12218:
URL: https://github.com/apache/cloudstack/issues/12218
### problem
While I was trying to create an instance from a backup, it failed.
I have tried both NFS and Linstor storage as target pools when restoring
from an NFS backup, and encountered this error.
`2025-12-10 09:17:21,196 ERROR [c.c.a.ApiAsyncJobDispatcher]
(API-Job-Executor-53:[ctx-29561268, job-857]) (logid:0ad3bb95) Unexpected
exception while executing
org.apache.cloudstack.api.command.admin.vm.CreateVMFromBackupCmdByAdmin
com.cloud.utils.exception.CloudRuntimeException: Failed to create Instance
[i-2-65-VM] from backup
[{"externalId":"i-2-64-VM\/2025.12.10.08.53.42","name":"nfs-0-nfs-0","uuid":"3acd3982-663f-4d2f-874c-364c5bb22a4a"}]
due to: Unable to restore contents from the backup volume
[0c3785e2-9473-4c5f-89d7-7c9e449e8bc7]..
`
I suspect that during the restoration process, the file name being looked
for may not match the actual file name stored in the backup, which could be
causing the failure to locate the backup file.
Here is a summary of some information. I will try to upload the relevant
logs for this part.
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No. | Storage Type | Backup Stroage | Volume ID | Volume Name in backup |
Backup info in database
-- | -- | -- | -- | -- | --
1 | Linstor | NFS | d9283f2c-26e9-4adf-9816-a54537b6e81a |
root.drbd1039.qcow2 |
[{"uuid":"d9283f2c-26e9-4adf-9816-a54537b6e81a","type":"ROOT","size":107374182400,"path":"d9283f2c-26e9-4adf-9816-a54537b6e81a","deviceId":0,"diskOfferingId":"5081ea5d-87ec-4903-a30d-7fab9c378ce8"}]
2 | NFS | NFS | 0c3785e2-9473-4c5f-89d7-7c9e449e8bc7 |
root.0c3785e2-9473-4c5f-89d7-7c9e449e8bc7.qcow2 |
[{"uuid":"0c3785e2-9473-4c5f-89d7-7c9e449e8bc7","type":"ROOT","size":107374182400,"path":"0c3785e2-9473-4c5f-89d7-7c9e449e8bc7","deviceId":0,"diskOfferingId":"880ba876-defd-4bf3-b28b-1a973c9dff53"}]
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### versions
4.22.0
### The steps to reproduce the bug
1. Provision virtual machines using LINSTOR and NFS as the primary storage
types respectively.
2. Back up the VMs to the NFS-based backup repository.
3. Attempt to restore the backup to a new virtual machine → Restore fails.
4. Shut down the original virtual machine, then restore the same backup to
it → Restore succeeds.
### What to do about it?
[log.txt](https://github.com/user-attachments/files/24066762/log.txt)
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