As we all know in the IT world, everything needs to be rebooted at times and CUCM is no exception. What is a good guideline to rebooting CUCM? Does Cisco have a specific guideline? I was trying to look through the SRND's for 7.x and 8.x and did not find any recommendations for maintenance. Any reference to a document would be greatly appreciated too!
Basic troubleshooting should be done first like probing the symptoms, patterns to isolate it to a certain extent. Then only you should get into restarting services or servers.
To reboot the cluster, you reboot the pub first. Use RTMT to verify it is completely back up. Then you reboot any TFTP servers (but if you only have 1 pub and 2 subs, I assume this does not apply to you). Then you reboot the subs. With just 2 subs, I would reboot them one at a time and verify all services are back up before doing the other. Also, check how many phones are registered at the beginning and make sure the same number a registered at the end.
To reboot the cluster you have to check en each Pub:
1-NTP Status( CLI :Utils ntp status, it should be Synchronized.
2-Db replication (CLI: utils dbreplication runtimestate, it should be without issue.
3-Backup from CUCM, CUC Backup for each server is separate, UCCX,IM&P.
4-Using RTMT check how many devices are registered before reboot and compare after rebooted.
Same thing , Cisco Recommended every 6 moths rebooted those Servers.