Increasing mail server /home partition size

To increase mail server /home partition size use following steps:

Create and attach a new larger drive
mount <new-device> /home2
rsync -aH --delete /home/ /home2/
service postfix stop
service dovecot stop
rsync -aH --delete /home/ /home2/
umount /home
umount /home2
Edit /etc/fstab by running blkid and copying UUID for /home entry
umount /home
Test using mount -a
df -h #and verify
service dovecot start
service postfix start
Optionally disconnect and delete old /home partition. Format drive if it is going to untrusted sources as private emails are present.

Anonymous