The Open Telekom Cloud (OTC) consists
of several environments; the environment that customers normally get to
see is the production environment. There is also a staging environment
that can be divided into several compartments and is used to test and
validate fixes; it is commonly referred to as PreProduction environment,
or short PreProd.
During this time, the Management/Control Plane (Web Interface and API)
will be unavailable several times for a number of minutes. The User/Data
Plane (Virtual Resources) will be unreachable for a few minutes as well.
In addition, due to the nature of the changes, the Virtual Machines
(ECS) will not be live-migrated during this round of updates; instead
all VMs will be terminated and restarted a few minutes later (cold
migration). The User Plane changes will be performed in AZ1 (eu-de-01)
before changes are started in AZ2 (eu-de-02), so cloud native
applications should not see a service disruption.