By default, your ssh daemon probably will kick you out after a period of no activity. I like to set the following in sshd_config:
TCPKeepAlive yes
ClientAliveInterval 60
#cryptsetup luksOpen /dev/HARDDISK DEVICENAME
#lvmdiskscan
#vgchange -ay
#ls -l /dev/mapper
#mkdir /media/crypt
#mount /dev/mapper/DEVICENAME /media/crypt
