Network Layer Flow Control via Credit Buffering
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- Hector Phelps
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1 Network Layer Flow Control via Credit Buffering Fibre Channel maintains throughput in the data center by using flow control via buffer to buffer credits Nominally switches provide credit buffering up to 10km distance Any wide bandwidth, long distance movement of data must couple flow control over the WAN System requires end-to-end credit buffering WAN gateway flow Control options Transparent mode - relies on the switches to extend the credits (good up to km) This method is used in all DWDM gateways and some SONET, IP devices Coupled Credit mode The gateway handles the buffer to buffer credits over the WAN. This is extensible up to great distances (1000 s of km). This method is used in most over SONET gateways IP gateways must provide credit buffering in conjunction with PAUSE and TCP/IP
2 Multiple Sources for Latency SAN Gateway Protocol 4 Latency (TCP over lossy network) Gateway SAN Distance Latency 2 Equipment Latency 1 Equipment Latency 3
3 Fibre Channel Over SONET / WDM Throughput (Mb/s) Real data throughput We have measured 536 Mb/s sequential SCSI Read to a disk at 6000 Km OC-12 IP OC-12 SONET OC-12 Routed IP OC-12 /SONET Distance (Kilometers) Data re-transmission due to IP packet loss limits actual IP throughput over
4 Fibre Channel over SONET The High Efficiency, Long Distance Hours Alternative Hours to Send 1 TeraByte OC-12 IP OC-12 SONET Distance (kilometers) New York Boston Chicago Denver Data re-transmission due to IP packet loss limits actual IP throughput over
5 Storage Over IP Using CNT Solutions
6 Joint Solution Overview Continuous Access XP UltraNet Edge, UltraNet Storage Director HP XP Disk Arrays (XP48/XP256/XP512/XP1024) HP Continuous Access software Cluster Extension XP and Continental Cluster All inter-networking options IP, ATM, T3, Metro Fiber optics StorageWorks DRM Enterprise Modular Array (Enterprise Virtual Array) DRM (Data Replication Manager) Software All inter-networking options IP, ATM, T3, Metro Fiber optics
7 Fibre Channel SAN Issues - Extensibility Native can not be transported over most service providers infrastructure. Wide area networks are based on IP or Ethernet and not,, therefore, costly point-to to-point Dark Fiber or DWDM is required to connect SAN. SAN SAN Fibre Channel SAN island
8 HP XP CA Remote Disk Mirroring Over WAN/IP HP Server ESCON / CNT UltraNet ATM/DS3 Compressed/IP CNT UltraNet ESCON / Primary HP XP48/256/512 Secondary HP XP48/256/512 HP Server
9 Storage Over IP Using Nishan IP Storage Solutions
10 Asynchronous Mirroring Going the Asynchronous Mirroring IP Network Production Site 1000s of miles Recovery Site Customer required fast replication with 2 sites 2000 miles apart FASTWRITE technology excels at long-haul optimized performance
11 Extending the Reach of Synchronous Replication Vtesse Networks - Europe Synchronous HDS TrueCopy IP Network Production Site 600 KM Recovery Site Nishan switches convert mirroring traffic to IP Synchronous data replication up to 600KM Expands the reach of Sync TrueCopy => more TC addressable market!!
12 Steinbach Credit Union Wireless IP SAN STEINBACH CREDIT UNION Winnipeg, Manitoba Steinbach, Manitoba 100 Meg Full duplex 16 Miles 16 Miles 100 Meg Full duplex Proxim Wireless Bridge Cisco GE to 10/100 Switch Comm. Tower Comm. Tower Comm. Tower Proxim Wireless Bridge Cisco GE to 10/100 Switch Nishan 4300 GE Nishan 3300 GE Server Server Server Server Server Server Servers Server Server Server Servers
13 Enterprise-class Scalability via SAN Internetworking Chicago New York Tokyo London IP Network (Campus, MAN, WAN) Servers & Disks. Fibre Channel SANs E_Port Fault in one SAN is not propagated to other fabrics E_Port Fibre Channel SANs. Servers & Disks Fault isolation provides router-like scalability Enterprise-class scalability Connectivity between Heterogeneous Fibre Channel switches Extensibility across any distance: campus, metro or WAN
14 High Availability And Disaster Tolerant SAN Considerations
15 Storage WAN (SWAN) Storage WAN (SWAN) Features Manage the WORLD as a single Entity Wide area data sharing/migration Storage Management/Reporting Shadow/Remote Backup Wide area DT Connectivity within standard infrastructure (Network) Span: The World
16 Fabric Extension OC3 Link ( mbs)* Extended Buffer Credits Extended Buffer Credits *Used to specify the speed of fiber optic networks. The base rate (OC-1) is Mbps. OC-2 runs at twice the base rate, OC-3 at three times the base rate ( Mbps), etc. Planned rates are: OC-1, OC-3, OC-12 ( Mpbs), OC-24 (1.244 Gbps), and OC-48 (2.488 Gbps
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