Each shelf has space for 2 modules, module A in the top slot and module B in the bottom slot, empty in the next picture. As we said before, shelves are connected to a loop or stack, each module has an IN port and an OUT port which allow shelf being chained, and between the modules you will see a little green display which will allow you to set the number of shelf inside the loop.
In the following picture you can see a single FAS controller with 2 shelves in loop 0a:. This is a single path configuration, but we will talk on that later. The picture shows how rx receive and tx transfer fibers from 0a port on the filer head are connected to IN port in module A in shelf 1, the from module A in shelf one rx and tx fibers are run from OUT port to IN port in shelf 2 module A.
Well, here we will make a quick stop and just say there are two types of ownership for disks. About the types of ownership, we have:. Software based: The less common one, the ownership of the disks in managed with the disk assign command, disks owned by a filer might be distributed across all shelves belonging to the cluster. Hardware based: The most common one, the filer connected to the A module of the shelves owns the disks.
As said in the previous sections of this post there are other supported configurations, such as metro cluster, but here we will cover the most common ones:. The most simple configuration, this is the less redundant solutions since it has many points of failures, such as a single controller, only 1 loop to each stack and only one module per shelf.
In this configuration, rx receive and tx transfer fibers are connected from any of the FC ports on the controller to IN port in module A in the first shelf of the loop or stack, then from module A in that shelf rx and tx fibers are run from OUT port to IN port in shelf 2 module A, and so on for all the shelves in each stack. This configuration is more secure than the previous one since it reduces all the single point of failures but one there is still only one controller :.
As you can see, in this case shelves have 2 modules each and there are two loops connected to the same stack of shelves 0a, solid line, and 0c, dotted line. Why have we used 0a for primary loop and 0c for secondary? Remember when we talked about disk ownership? Apakah konten ini tidak pantas?
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Sheelnidhi Gupta. Sap Suresh Pathapati. Rodrigo Tocantins. Vinay Kumar. Mohit Garg. Srinivasa Rao S. Basic Concepts for Clustered Data Ontap 8. Populer di Computer Hardware. Anjali Pujar. Ianna Kyla Batomalaque. Yasir Butt. Reginaldo Souza. Scout St. Abdullah Muzammil. Peterfi Zsu. At Express Computer Systems we'll ship the majority of our orders out the same day payment is made.
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