Online migration of arbitrary filesystems, possible?

[Valdis.Kletnieks at vt.edu]

On Fri, 29 Mar 2013 17:09:14 -0300, Daniel Hilst said:

> The idea is, mount both filesystems "together", and make write/read
> operations go on this way
> Read operations:
>      1. See if data is already on dest fs,
>      2. If is then read data and bright back to caller (lets call this
> cold read)
>      3. If is not, then read file from source fs, put it on page cache,
> and change the backstorage of that page..
>      3.1 So when this page get dirty or too old, it will be writed to

Any reason you can't just 'rsync /source-fs /dest-fs'?

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