[Xen-API] VM_REVERT_FAILED

[ka <ka@xxxxxxxx>]

Hello.

I use ZFS-based NFS storage for xen.

I am trying to get safe backup throuhg Xen API with following algorithm:
Before create ZFS snapshot I create XEN VM snapshot, export VM metadata 
and do ZFS snapshot.
After this I delete snapshot and its VDI.

But when I try to revert VM, I have strange behavior of VM.revert operation.

I rollback my ZFS storage, unregister VM, import VM metadata, rescan SR 
and try to call VM.revert function. Its return VM_REVERT_FAILED message.
*The strangeness of the fact that when I ignore VM_REVERT_FAILED 
exception and try to repeat VM.revert call - it works fine.*
I mean that second call of VM.revert works without error (There is no 
pause between them).
Any idea? What can I do to get more information about reason of this error?

--
Many thanks in advance.












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