Strategies for Data Protection - Brocade

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Chapter 1: Building the FoundationIn a SAN environment, a mesh topology provides any-to-any connectivityby using inter-switch links between each switch or director in thefabric, as shown in Figure 3. As more device ports are required, additionalswitches and their requisite ISLs are connected. Because eachswitch has a route to every other switch, the mesh configuration offersmultiple data paths in the event of congestion or failure of a link, portor switch. The trade-off for achieving high availability in the fabric, however,is the consumption of switch ports for ISLs and increasedcomplexity of the fabric cable plant.Mesh topologies are inherently difficult to scale and manage as thenumber of linked switches increases. A mesh topology with 8 switches,for example, would require 28 ISLs (56 if 2 links are used per ISL). Asthe switch count goes higher, a disproportionate number of ports mustbe devoted to building a more complex and expensive fabric. Consequently,as a best practice recommendation, mesh topologies for SANsshould be limited to 4 switches.A more fundamental problem with mesh topologies, though, is theassumption that storage networks need any-to-any connectivitybetween peers. Although this model may be valid for messaging networks,it does not map directly to storage relationships. SAN enddevices can be active participants (initiators) or passive participants(targets). Initiators do not typically communicate with one another aspeers across the SAN, but with storage targets in a master/slave relationship.Storage arrays, for example, do not initiate sessions withservers, but passively wait for servers to instigate transactions withthem. The placement of storage targets on the SAN, then, should be tooptimize accessibility of targets by initiators and not to provide universal,any-to-any connectivity. This goal is more readily achieved with acore-edge design.8 Strategies for Data Protection
Storage-Centric vs. Network-Centric SAN ArchitecturesCore-Edge SAN TopologiesCore-edge SAN topologies enable a storage-centric, scalable infrastructurethat avoids the complexities of mesh topologies and limitedcapacity of flat SAN topologies. The core of the fabric is typically providedby one or more director-class switches which provide centralizedconnectivity to storage. The edge of the fabric is composed of fabricswitches or directors with ISL connections to the core.Figure 4. A core-edge SAN topology with classes of storage andserversAs shown in Figure 4, the heavy lifting of storage transactions is supportedby the core director since it is the focal point for all storageconnections, while the edge switches provide fan-in for multiple serversto core resources. This design allows for connectivity of differentclasses of servers on paths that best meet the bandwidth requirementsof different applications. Bandwidth-intensive servers, forStrategies for Data Protection 9
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STRATEGIES FORDATA PROTECTIONFIRST
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