Presentation on theme: "Storage area Network(SANs) Topics of presentation"— Presentation transcript:
1 Storage area Network(SANs) Topics of presentation What is Storage Area NetworkBenefits of SAN EnvironmentSAN ComponentsPotential Storage Services LocationsChallenges of SAN ManagementWays to Manage a Storage SubsystemWORLD WIDE NAMESSimple Architecture of SANRedundant Architecture of SANFibre channel vs. IP based technologySummary of RAID levelsStorage services requirement
2 STORAGE AREA NETWORKA dedicated network that interconnects hosts and storage devices, usually via fibre channel (FC) switches and optical fiber media. A storage device is a disk sub system array with a set of disk drives.Local Area NetworkFibre Channel ServersFibre Channel Storage Area Network
3 Benefits of SAN Environment Storage ConsolidationConcurrent Access by Multiple HostsUse in Disaster Recovery ApplicationsReduced Total Cost of OwnershipReduction of management complexity/overheadImproved availabilityScalabilityImproved data protectionIncreased capacity usage
4 SAN Components FC cable It is a high-speed data transmission technology used to connect multiple hosts and storage devices over fiber-optic or copper cables.SFP ModuleSmall Form-Factor Pluggable (SFP) modules are transceivers that interface a motherboard with a FC cable and are used to covert electrical signals to optical signals required for fibre channel transmission to and from devices such as RAID controllers, switches and other fibre channel devicesHost bus adapters (HBAs)It is also referred to as FC interface cards are installed into hosts. OS-specific device drivers are usually installed for these adapters.Storage devicesRAID architecture where all disks are independently addressed.Interconnect devices such as fibre channel hubs or switches. Other special-purpose devices are SAN gateways, bridges, routers, and extenders
5 Potential Storage Services Locations Area of IntelligenceHardware PlatformHostServersMainframesFabricAppliancesSwitchesDirectorsSubsystemDisks/RAIDs/ControllersFilersTape Libraries
6 Challenges of SAN Management A SAN must be managed at multiple pointsServer OSHBASwitchStorage ArrayDependenciesThe biggest challenge is understanding the dependencies of the various elements upon each other.Device drivers compatibility issues.ProblemsThe new HBA has a different WWN than the oldone and so zoning information in the SAN.
7 Ways to Manage a Storage Subsystem Out-of-Band Storage SubsystemsThe controllers in the storage subsystem are managed directly over the network through the Ethernet connection on each controller in the storage subsystem.In-Band Storage SubsystemsThe controllers in the storage subsystem are managed through an Ethernet connection on a host instead of using the Ethernetconnections on each controller
8 WORLD WIDE NAMESIt guarantees uniqueness within a large SAN fabric. There are two type of WWNs:Node WWNs—These are allocated to the entire adapter.Port WWNs—These are assigned to each port within an adapter. These are used for SAN zoning
9 Simple ArchitectureThe Fibre Channel switch is an intelligent device that collects information about the SAN network topology and attached devices.Switches Enable simultaneous communication between multiple endpoints (such as a server and storage disk)Provide capabilities for managing those connections between devices so that access is controlled (through zoning)Provide physical connectivity for failover and load balancing
10 Redundant Architecture redundant components—controllers, switches, ports, HBAsCabling to ensure that there is no single point of failure.No cable connection between the two switches.Switches remain independent.
11 Redundancy in various component Redundancy can be on host level Multiple HBA’s.Redundancy can be on switch level two or more switches.Redundancy can be on storage level ,connecting storage controller with Expansion units.
12 Fibre channel vs. IP based technology ServersFibre ChannelCost and complexityFibre Channel networking requires specialized expertise.Fibre Channel networking components are considerably more expensive than IP.Performance4 GB Fibre Channel networking components available todayDeterministic performanceIPCost and complexityEthernet and TC/IP networking technologies are familiar.Ethernet networking components are less expensive.One networking technology to network clients, servers, and storage.Performance1 GB Ethernet networking components available todayNot ideal for SAN solutionFabric devicesStorage arrays
13 RAID levelsRAID 0 is the fastest and most efficient array type but offers no data redundancy or fault-tolerance.RAID 1 is the array technique of choice for performance-critical, fault-tolerant environments and is the only choice for fault-tolerance if no more than two drives are available.RAID 3 is a popular choice for data-intensive or single-user applications that access long sequential records. However, it does not typically allow multiple I/O operations to be overlapped.RAID 5 is generally the best choice for multi-user environments that are not particularly sensitive to write performance. At least three, and typically five or more drives are required to build a RAID 5 array.