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If you need to remove some package from your Debian based system you can do that by this

dpkg --force-depends --purge package_name

and install it back by

apt-get install package_name

*package_name is your package

Using Maildir format in Debian 7:

• mail notification after login
• mail notification after ssh login
• read mail using mailx or mail command

BTW: set delivery agents to use Maildir before

U can see some usefull things below.

XCP:

• VNC console cs_CZ keymap = use en layout(gnome) while connection to DOM0 console(via tunnel like ssh -CN -L 5900(localport):localhost:5901 $HOST)
• no LVM in storage type = create symlink from LVHDSR.py to LVHDSR in /usr/lib/xcp/sm/
• HVC console = /etc/default/grub (CMDLINE_LINUX="console=hvc0") /etc/inittab (co:2345:respawn:/sbin/getty hvc0 9600 linux)

Network bonding on debian:

mode used: balance roundrobin
NICs: 2x 100Mbit
application: ifenslave-2.6 (Debian Wheezy repos)
configs: /etc/network/interfaces
kernel: 3.2 (deb official)

sometimes is need to put "alias bond0 bonding \
options miimon=100 downdelay=200 updelay=200"
to /etc/modules|modprobe.d/