How to convert Ext4 to XFS linux debian without data loss?

Question

linux

The bottom line is, there is a mongodb 3.2 base with a WiredTiger storage engine, there is the following in the mongo mana

With the WiredTiger storage engine, use of XFS is strongly recommended to avoid performance issues that may occur when using EXT4 with WiredTiger.

The task is to replace the file structure with ext4 --> xfs
I would like it without the option of backing up the database and reinstalling the server.

Answer 1

no database backup option

Никак. Когда в процессе конвертации все навернется, а у вас не будет бекапа, вы будете сами себе делать депиляцию. Везде.
Создайте второй раздел и скопируйте на него все свое барахло.