Online migration of arbitrary filesystems, possible?

[Daniel Hilst]

On 29-03-2013 18:06, Valdis.Kletnieks at vt.edu wrote:
> 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'?
>
because I can't use dest-fs while rsynching

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