[Hampshire] Safely unmounting a server's external hard drive

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Author: Chris Dennis
Date:  
To: Hampshire
Subject: [Hampshire] Safely unmounting a server's external hard drive
Hello folks

I'm planning to use one or more external USB hard drives to backup a
headless server running Debian. I'll probably use rsnapshot, with a
script that detects for the presence of the right drive.

But how can the server tell the user when it is safe to unplug the
drive? Or maybe the user should somehow tell the server "I want to
unplug the drive -- stop using it and unmount it".

The user's only way of communicating with the server is by email or
possibly via Webmin.

Has anyone come up with a cunning plan to deal with this?

cheers

Chris
-- 
Chris Dennis                                  cgdennis@???
Fordingbridge, Hampshire, UK