qrcoder c# Storage Area Networks (SAN) Scenarios in Objective-C

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Storage Area Networks (SAN) Scenarios
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Many corporations are dispersing critical data over wide geographic areas using storage networking concepts (SAN) Again, there are various applications of interest here Foremost is disaster recovery (via remote backup) to ensure mission-critical operation during natural disasters, power outages, and so on Another requirement is for real-time, synchronized mirroring (replication) of data at different sites for load-balancing, business scaling/productivity, and so on Finally, the storage-on-demand market is also being explored by some provider organizations In all of these settings, geographic diameters are generally limited to 100 km, although these are expected to scale over the years Today, Fibre Channel is the most prevalent SAN technology, delivering extremely reliable transfers via a low-latency block transfer protocol Related interface speeds range from 10 to 10 Gbps, and most setups are of a closed nature, implemented over dark fiber Given its specialized nature, Fibre Channel requires skilled technical staff, yielding a high total cost of ownership (TCO) It is here that new IP/Ethernet-based standards are helping to open up this sector to improved economies of scale, namely, Fibre Channel over IP (FCIP), which allows organizations to recoup their SAN investments and extend interfaces over ubiquitous IP domains Meanwhile Internet SCSCI (iSCSI) and remote direct memory access (RDMA) move a step further by directly implementing SAN-type transfers at the IP/Ethernet layer
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IP/Ethernet-based storage will inevitably drive high-end EPL service growth Namely, EoF and EoWDM are much better positioned (versus EoS, EoMPLS, or EoRPR) given the multigigabit speeds of most SAN interfaces For example, many corporations may consider lower-cost EoF solutions using Gigabit Ethernet FCIP (iSCSI) interfaces to complement (replace) Fibre Channel in leased or owned-fiber scenarios Alternatively, EoWDM is more compelling since corporations can preclude costly fiber infrastructure builds and instead purchase guaranteed hard-QoS EPL services for storage extension This approach also gives much larger geographic coverage for SAN applications Note that many SAN vendors also offer Fibre Channel DWDM interfaces (50 100 km reach) that will inevitably compete with EoWDM strategies Nevertheless, carriers can leverage WDM technology to transparently host both types of storage networking solutions over metro/regional networks a key advantage
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Residential and Backhaul Scenarios
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The growing scalability and convergence in the access space (highlighted in Solution Drivers for Ethernet over Fiber/WDM ) is driving the need for bulk data backhaul In particular packet-video services represent a primary growth area and residential providers are offering a very broad range of related services, for example, IP TV, videoon-demand (VoD), personal video recorder (PVR)/playback, and so on Now typical broadcast quality video requires about 4 Mbps per stream, whereas higher-end DVD quality requires about 9 10 Mbps per stream Aggregating these figures over large user populations gives genuine multigigabit requirements, and hence many VoD servers already support Gigabit and 10 Gigabit Ethernet interfaces In response to this growth, nearly all cable operators have moved to HFC setups, using fiber to interconnect master head-ends with dispersed local hubs Meanwhile incumbents are actively pursuing the residential video market to offset declines in longdistance voice Here video delivery architectures are being overlaid on top of entrenched metro/edge fiber-plants Namely localized video switching offices (VSO) at smaller edge ring sites are being interconnected to video hub offices (VHO) at larger metro core/ regional hubs The former sites connect to DSL access multiplexers (DSLAM) or PON optical line terminals (OLT) units for last-mile delivery Meanwhile, the latter sites house large VoD servers Overall EoWDM is ideal for native packet-video backhaul over existing cable/incumbent fiber plants Scalability is the paramount concern here, and only multi-channel DWDM can realistically provision large head-end flows with thousands of homes crossed Moreover, because head-end/hub or VSO/VHO locations are largely fixed, lower-cost static OADM setups are also very feasible Additionally, the wireless sector is seeing very strong growth with the induction of 35G technologies and new service types Most notably, web access and video streaming /casting are the key bandwidth drivers, and wireless operators are also converging to IP/Ethernet packet-switching architectures However, most wireless access devices, such as base-station controllers, still use older T1/E1 private lines for data backhaul over SONET/SDH networks Here, related legacy private line service costs can consume about 40 60 percent of a typical wireless operator s operational expenditures,
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