Change filesystem type in V2 manifest schema

Ponraj E
 

Hi,
 
Here in the bosh docs https://bosh.io/docs/persistent-disk-fs.html, it is mentioned that if we want to change the filesystem type, we have to change the persistent disk size.
Why is the disk size change mandatory for the filesystem change?
 
We have a use case where we want to migrate the deployment from ext4 filesystem to xfs filesystem. But as per the docs, this happens only when the disk size is also changed.

Appreciate the help.

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