storage controller
The component of a storage system that runs the Data ONTAP operating system and controls its disk subsystem. Storage controllers are also sometimes called controllers, storage appliances, appliances, storage engines, heads, CPU modules, or controller modules.
storage system
The hardware device running Data ONTAP that receives data from and sends data to native disk shelves, third-party storage, or both. Storage systems that run Data
ONTAP are sometimes referred to as filers, appliances, storage appliances, VSeries systems, or systems.
Cluster and high-availability terms below:
cluster
- In Data ONTAP 8.x Cluster-Mode, a group of connected nodes (storage systems) that share a global namespace and that you can manage as a single virtual server or multiple virtual servers, providing performance, reliability, and scalability benefits.
- In the Data ONTAP 7.1 release family and earlier releases, a pair of storage systems (sometimes called nodes) configured to serve data for each other if one of the two systems stops functioning.
- In the Data ONTAP 7.3 and 7.2 release families, this functionality is referred to as an active/active configuration.
- For some storage array vendors, cluster refers to the hardware component on which host adapters and ports are located. Some storage array vendors refer to this component as a controller.
HA (high availability)
- In Data ONTAP 8.x, the recovery capability provided by a pair of nodes (storage systems), called an HA pair, that are configured to serve data for each other if one of the two nodes stops functioning.
- In the Data ONTAP 7.3 and 7.2 release families, this functionality is referred to as an active/active configuration.
HA pair
- In Data ONTAP 8.x, a pair of nodes (storage systems) configured to serve data for each other if one of the two nodes stops functioning.
- In the Data ONTAP 7.3 and 7.2 release families, this functionality is referred to as an active/active configuration.
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