Hi, may I know how to stop SLA agent?

Our purpose is to stop SLA time counting of all cases during an upgrade.

So I think we need stop SLA agent, right? How?

Another question is, during the SLA agent stopping period, how about the SLA triggered actions that should have been triggered during the period? Are they lost, or just delay to run after SLA agent resumed?

The actions may include: increase case urgency, write case history log, send an email, run an activity, etc...

Thanks.