# Technical Details
Maximum disk size local storage defined in QCOW2 image. 
# SOP
DHCP ports gone -> openstack subnet set --no-dhcp, openstack subnet set --dhpc. (toggle) -> they should be recreated. (https://bugs.launchpad.net/ubuntu/+source/neutron/+bug/2015377)
## Maintenance
Announcing maintenance:
* Maintenance that requires customer interaction: at least 14 days ahead of time
* Regular maintenance with few seconds downtime at most: at least 7 days ahead of time
* Emergency maintenance: as soon as possible and preferably before doing anything
Notify MCS: mcs-support@group.one