Clustered OnTap

Clustered Data ONTAPMCC DeploymentApril 10th 2013Metro Cluster C-ModeTwo SitesMCC deployment consists of two C-Mode clusters, one cluster at each of two sites. Cross-site synchronous disaster recoveryConnectivity between site:One or more Ethernet Wan link(s)Four Fiber links for FCVI and Storage Traffic

Terminology 1FC - Fiber Channel is a high-speed, low latency network technology primarily used for storage networking.

FC Fabric - a network topology where FC nodes connect with each other via one or more FC switches.Local / Remote - Subjective term referring to one SITE in MCC

Site - Geographical location of the two clusters. There are two (2) SITES in a MCC Cluster Peering - A management relationship between two clusters that allows the clusters to exchange data and request remote operations.FCVI - Fiber Channel Virtual Adapter, FCVI adapter uses RDMA operation to copy the local NVRAM section to remote NVRAM section.

Terminology 2RDMA - Remote direct memory access is a direct memory access from the memory of one computer into that of another without involving either one's operating system. This permits high-throughput, low-latency networking, which is especially useful in massively parallel computer clusters.SAS - Serial attached SCSI. Newer NetApp disk shelfs have SAS connectivityFC-SAS Bridge - Converts SAS traffic into fiber channel traffic. FC overcomes the distance limitations of the SAS interface. Atto Fibre bridge.ISL - Inter-Switch link. A physical link between fiber channel switches used to extend the FC fabric. MCC configurations connect sites with two (2) ISL links.

8-Pack MCC Diagram

Whats Really Different

Atto (Armadillo) Converts SAS to FC. This converts short range SAS traffic on to long range FC media. Each Atto provides a single path to storage. FC Switch (brocade)FC Switch(brocade)Site ASite BFC Bridge (Atto)FC Bridge (Atto)Redundant Fabrics

FC ZoningThink of a FC zone as a VLAN. Nothing more than a traffic isolation zone.MCC requires Hard Zoning (port zoning.)Each Brocade needs to have a different Domain ID.Keep it simple!Brocade zoning exampleGoal: We want ports 0 and 1 on both switches to be in the same zone.Format (domain ID, switch port)zone: mcc_3240_4_storage 1,0 1,1 2,0 2,1

FC ZonesEach Fabric will have two zones:

Effective configuration: cfg: mcc_3240_4 zone: mcc_3240_4_fcvi 1,6