first step

https://wiki.zoneminder.com/Ubuntu_Server_14.04_64-bit_with_Zoneminder_1.29.0_the_easy_way

second, moving the recording partition

https://wiki.zoneminder.com/Using_a_dedicated_Hard_Drive

third

see how the ip camera setting with zoneminder

fourth, set the filter for automatic deletion

http://zoneminder.readthedocs.org/en/latest/faq.html

fifth, set the timer when to record and stop

using crontab