(Multiple choice) in use Rainbow, When migrating, which of the following descriptions about the applicable scenarios of file-level migration and block-level migration are correct?
- Block-level migration for hosts with low source disk usage
- File-level migration is suitable for scenarios that need to expand or reduce the capacity of the destination disk
- The destination partition structure of block-level migration needs to be consistent with the source side.
- Block-level migration is suitable for hosts with a large number of small files at the source
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