[Dovecot] Maildir feature I'd like to see - SSD for newer messages

[Tom Talpey]

On 12/23/2010 3:13 PM, Marc Perkel wrote:
> I wonder if there's any way to do this. Say there are two different
> storage devices mounted as follows:
>
> /slow-hard-drive/email-directory
> /fast-ssd-drive/email-directory
>
> Now suppose there were a way to join these drives so that you could
> access them as a single directory:
>
> /joined-drive/email-directory
>
> The Dovecot could see the joined drive but my backup/archiving scripts
> could see the drives independently and move old data from the fast
> drives to the slow drives.
>
> I think back in the old DOS days you could do that. Is there a way in
> Linux to do the same thing? Join two directories so as to make them look
> like one?

This is getting rather far from Dovecot, but I believe you're looking
for unionfs: http://en.wikipedia.org/wiki/UnionFS