Quiesce I/O in application containers before creating a Snapshot/Clone
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enhancement
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Description
It would be amazing if CSI-Addons can provide a way to temporary quiesce I/O while a volume snapshot is made.
The process could look a little like this:
1. a user initiates Quiesce
2. csi-addons execs a command in the application container (flush I/O, pause VM, ...)
3. csi-addons calls `fsfreeze` or similar the NodePlugin where the volume is mounted
4. the user creates a snapshot/clone
6. csi-addons calls `unfreeze` or similar the NodePlugin where the volume is mounted
7. csi-addons execs a command in the application container (resume VM, ...)
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