Major Description
Hi lads,
This is a kind of blocker bug: editing a VDI snapshot will remove its "snapshot-of" value. Let me give you a simple example.
First, let's create a VM snapshot:
# xe vm-snapshot uuid=ad87ecf7-0ce8-498f-355f-1ebbdfd55702 new-name-label=test d389271f-609b-603c-1dac-5c0e95274505
Let's get its VDIs:
# xe snapshot-disk-list uuid=d389271f-609b-603c-1dac-5c0e95274505 Disk 0 VBD: uuid ( RO) : c61b5e80-ebbd-b976-1392-6232a5041f9b vm-name-label ( RO): test userdevice ( RW): 0 Disk 0 VDI: uuid ( RO) : 2956e278-614a-4581-9e51-6a85cf9838ec name-label ( RW): root sr-name-label ( RO): ZFS SSD virtual-size ( RO): 4294967296
Okay let's check the VDI in detail:
# xe vdi-param-list uuid=2956e278-614a-4581-9e51-6a85cf9838ec uuid ( RO) : 2956e278-614a-4581-9e51-6a85cf9838ec name-label ( RW): root name-description ( RW): root disk is-a-snapshot ( RO): true snapshot-of ( RO): 928badfe-1f06-4385-8efe-62f53132e8d7 snapshots ( RO): snapshot-time ( RO): 20170515T09:24:37Z allowed-operations (SRO): forget; generate_config; update; resize; destroy; clone; copy; snapshot current-operations (SRO): sr-uuid ( RO): e6616eb6-d719-b7a3-95a8-73881b90c25e sr-name-label ( RO): ZFS SSD vbd-uuids (SRO): c61b5e80-ebbd-b976-1392-6232a5041f9b crashdump-uuids (SRO): virtual-size ( RO): 4294967296 physical-utilisation ( RO): 12800 location ( RO): 2956e278-614a-4581-9e51-6a85cf9838ec type ( RO): User sharable ( RO): false read-only ( RO): false storage-lock ( RO): false managed ( RO): true parent ( RO) [DEPRECATED]: <not in database> missing ( RO): false is-tools-iso ( RO): false other-config (MRW): xenstore-data (MRO): sm-config (MRO): vhd-parent: a21c8e06-8b5b-4411-9cbe-22698bacf5a1 on-boot ( RW): persist allow-caching ( RW): false metadata-latest ( RO): false metadata-of-pool ( RO): <not in database> tags (SRW):
Okay, now, let's edit the description of this VDI:
# xe vdi-param-set name-description=foobar uuid=2956e278-614a-4581-9e51-6a85cf9838ec
And re-display the VDI details:
# xe vdi-param-list uuid=2956e278-614a-4581-9e51-6a85cf9838ec uuid ( RO) : 2956e278-614a-4581-9e51-6a85cf9838ec name-label ( RW): root name-description ( RW): foobar is-a-snapshot ( RO): true snapshot-of ( RO): <not in database> snapshots ( RO): snapshot-time ( RO): 20170515T09:24:37Z allowed-operations (SRO): forget; generate_config; update; resize; destroy; clone; copy; snapshot current-operations (SRO): sr-uuid ( RO): e6616eb6-d719-b7a3-95a8-73881b90c25e sr-name-label ( RO): ZFS SSD vbd-uuids (SRO): c61b5e80-ebbd-b976-1392-6232a5041f9b crashdump-uuids (SRO): virtual-size ( RO): 4294967296 physical-utilisation ( RO): 12800 location ( RO): 2956e278-614a-4581-9e51-6a85cf9838ec type ( RO): User sharable ( RO): false read-only ( RO): false storage-lock ( RO): false managed ( RO): true parent ( RO) [DEPRECATED]: <not in database> missing ( RO): false is-tools-iso ( RO): false other-config (MRW): xenstore-data (MRO): sm-config (MRO): vhd-parent: a21c8e06-8b5b-4411-9cbe-22698bacf5a1 on-boot ( RW): persist allow-caching ( RW): false metadata-latest ( RO): false metadata-of-pool ( RO): <not in database> tags (SRW):
As you can see, the snapshot-of field is now missing. In other word, this VDI is not linked anymore to the VM snapshot, and therefore you can't revert it.
