nova-zvm-virt-driver/doc/source/topology.rst

Topology

Generic concepts and components

Following picture shows a conceptual view of the relationship between any OpenStack solution and z/VM.

An OpenStack solution is free to run its components wherever it wishes; its options range from running all components on z/VM, to running some on z/VM and others elsewhere, to running all components on other platform(s). The solution is also free to source its components wherever it wishes, either using z/VM. OpenStack enablement components or not.

z/VM ships a set of servers that provide local system management APIs. These servers consist of request servers that accept local connections, receive the data, and then call one of a set of worker servers to process the request. These servers are known collectively as SMAPI. The worker servers can interact with the z/VM hypervisor (CP) or with a directory manager. A directory manager is required for this environment.

Overall architecture

z/VM openstack enablement rely on z/VM cloud connector, the compute service (nova-compute) can either run on remote server other than z/VM itself or run on top of virtual server which hosted on z/VM.

Function Call flow

Following is a picture describe the call routine of spawn function, openstack zvm driver managed zvm through REST API call provided by zvm cloud connector.

actdiag {

nova.spawn -> driver.spawn -> sdk.createuser -> zvm.createuser ->

sdk.adddisk -> zvm.adddisk -> sdk.setupnet -> zvm.setupnet

lane nova-compute {

label = "nova compute" nova.spawn [label = "nova compute driver spawn"]

}

lane zvm-driver {

label = "zvm driver" driver.spawn [label = "zvm driver spawn"]

}

lane zvm-cloud-connector {

label = "zvm cloud connector" sdk.createuser [label = "create zvm user definition"] sdk.adddisk [label = "add disk to created user"] sdk.setupnet [label = "setup network to created user"]

}

lane zvm-system-management {

label = "zvm system management interface" zvm.createuser [label = "use zvm dirmaint to create user"] zvm.adddisk [label = "use zvm dirmaint and cp to add disk"] zvm.setupnet [label = "use zvm cp to setup network"]

}

}

Compare between vmware

Here's architecture comparsion between z/VM and vmware enablement for openstack.