What the difference between Independent & persistent and Independent & nonpersistent?

Yes, friend!

The disk has three models in FusionCompute, Dependent, Independent & Persistent, and Independent & Nonpersistent. 

Dependent: A dependent disk is included in the snapshot. Changes are written to disks immediately and permanently.

Independent & persistent: In this mode, disk changes are immediately and permanently written into the disk, which is not affected by snapshots.

The system does not create snapshots for the disks of a VM when creating snapshots for the VM. When the VM snapshot is used to restore a VM, the VM disks are not restored.

Independent & nonpersistent: In this mode, disk changes are discarded after the VM is stopped or restored using a snapshot.

If Independent & persistent or Independent & nonpersistent is selected, the disk data will not be backed up when a snapshot is taken for the VM and will not be restored when the VM is restored using a snapshot.

After a snapshot is taken for a VM, if disks on the VM are detached from the VM and not attached to any other VMs, the disks will be attached to the VM after the VM is restored using the snapshot. However, data on the disks will not be restored.

If a disk is deleted after a snapshot is created for the VM, the disk will not be attached to the VM after the VM is restored using the snapshot.

Constraints:

If the data store type is virtualized local disks and the disk type is Shared, the disk does not support snapshot creation, and independent & persistent is selected by default.

If the disk type is Non-shared, the disk mode can be set to Independent & nonpersistent.

Hope this can help you!