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Scale-out architecture
Logically, the platform platform is layered into three different zones:
- Access Zone is the layer where users access the system through a graphical interface or command line interface to perform operations and maintenance tasks.
- Control Zone hosts configurations and provides storage and a range of services that are essential to the systemthe MediationZone system.
- Execution Zone is a scale-out layer that provides processing capacity in the system. This layer contains one or several Execution Contexts and Service Contexts, which are distributed over any number of servers.
- Execution Contexts are responsible for executing and supervising workflows.
- Service Contexts host services that workflows running in Execution Contexts can share.
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Platform
- Execution Context (EC)Execution Context Stand-Alone (ECSA)
- Service Context (SC)
- Command Line Tool (mzsh)
- Desktop
EC and ECSA are similar. However, while ECs always depend on a running Platform, ECSAs can run independently.
The Platform, ECs, ECSAs, and SCs run in "containers", that are installed on one or more hosts. Each installation is assigned a container name to identify it uniquely within a system. One host, physical or virtual, may hold several containers, each one with a unique name and installed in separate home (MZHOME) directories.
There are two types of containers:
- The Platform Container runs the Platform and optionally EC, ECSA and SCs. The Platform is always included in a Platform Container installation.
- Execution Containers run ECs, ECSAs and SCs. These pico instances are typically configured after the installation of the container.