CACTUS Memory Upgrade
Additional memory will be added to the production CACTUS server, which will require a reboot. An estimated 5 minute outage will occur during this maintenance activity. All CACTUS services will be available following the activity. This change is being worked through ServiceNow Change Request CHG0035299.
More information: CACTUS Memory Upgrade
Story added 9. February 2016, content source with full text you can find at link above.