CloudSimple provides notification several days prior to a scheduled maintenance interval. Maintenance is done in a non-disruptive way to ensure the availability of your Private Cloud. Maintenance can be of the following types:
CloudSimple infrastructure. CloudSimple infrastructure is designed to be highly available. During this type of maintenance interval, redundant components are updated one at a time to avoid any service interruption. You maintain access to your Private Cloud vCenter, all virtual machines, the internet connection from your Private Cloud, and connections to on-premises or Azure.
CloudSimple portal. During this type of maintenance interval, some features on the CloudSimple portal may be disabled or inaccessible. The notification prior to the maintenance interval includes details on feature limitations while maintenance is taking place.
Source: Azure Documentation FAQ