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The object entity-relationship diagram is modeled below:
0..N 0..N 0..N Plugin -----> Device ------> Path <------ Adapter <------ | ------> 0,1 | 1 | | 0,1 \|/ TargetDescription and reasoning behind the relationships:
When a storage device driver is loaded, it claims a PCI device as a host bus adapter. This host bus adapter is represented as an Adapter. The PCI device identifier is a property on the HostBusAdapter in the Adapter.
Once the host bus adapter is on the system, the hardware bus is scanned. If a storage Device is found on the bus, the communication path to the Device from the the host bus adapter is represented by a Path. A Device may have more than one Path. How those Paths are composed to create a Device is determined by a storage Plugin.
When a storage Plugin is loaded, it claims a set of Paths. It groups these Paths into a set of Devices. Devices are hence associated with a set of Paths that might be used to provide a single logical device such as in the case of multipathing. Devices may be also composed of zero Paths meaning that they do not directly use a host bus adapter for communication with underlying storage.
The purpose of this data object is to represent the topology of storage as seen by the base plug-store system. There is some overlap with information in other objects such as ScsiTopology which is only applicable when a particular "native multipathing" plugin is used. This data object provides the complete inventory of Devices and Paths. Hence it provides a superset of Device mappings over data object such as ScsiTopology and Multipa
The use cases that this data object accommodates includes the following non-exhaustive list:
Properties
Name | Type | Description |
---|---|---|
adapter* | HostPlugStoreTopologyAdapter[] |
List of host bus adapters in the plug store inventory.
|
device* | HostPlugStoreTopologyDevice[] |
List of devices in the plug store inventory.
|
path* | HostPlugStoreTopologyPath[] |
List of paths in the plug store inventory.
|
plugin* | HostPlugStoreTopologyPlugin[] |
List of plugins in the plug store inventory.
|
target* | HostPlugStoreTopologyTarget[] |
Partial list of targets as seen by the host. The list of targets
may not be exhaustive on the host.
|
Properties inherited from DynamicData | ||
None |
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