Netapp 7-Mode Architecture

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7-Mode is made up of two controllers that is also called HA Pair (High availability Pairs)

 Controller : Controller (also referred to as Node) is the brain of Storage System where Operating System (Data ONTAP  Resides) and which deals with Read and Write operations. And it also contain memory, CPU.

 Disk Shelve: Disk Shelves are connected to the Controller in Daisy-Chained format, Disk shelve contain the actual physical disk on which your data resides.

 HA cable : The cable which connected two controller is called HA cable which is used for sending Keep alive signal between controllers which is used for Fail-over purpose that we will discussed later.


7 Mode Scalability Limitations:

·         You can have maximum 2 FAS Controllers
·         Disks owned by controller 1 can be accessed by controller 1 only
·         Data can be moved amongst the disk of on the same controllers, but moving data between controllers or system is disruptive to client and more complicated.
Limited amount of disks and throughput that can be handled by single node.
Traffic which are owned by controller 1 will always go through controller 1

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