move mailbox path to another harddisk

Hi,
we need to increment the space for our mailboxes because the internal hard disk is filling up. So we want to move the /var/vmail directory to an external hard disk like /mnt/harddisk/var/vmail.

what is the best solution to do this flawlessly with postfix/dovecot and ispconfig 3.1?

Best regards
chico

 

mount the new hdd to /mnt
stop postfix, dovecot and amavis
mv /var/vmail/* to /mnt
set the permissions on /mnt to vmail.vmail
umount /mnt
mount new hdd /var/vmail
start postfix, dovecot and amavis

 

Ah ok,
But what must i do if i want to use the new disk not only for postfix but also for /var/www ?
So that I have /mnt/newdisk/var/vmail and /mnt/newdisk/var/www on this hard disk?

 

stop the webserver, move /var/www to the new hdd and mount the new hdd.
new hdd:
/var/vmail - mail
/var/www - web