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Storage Area Networks

Storage Area Networks. What’s SANs. SAN Solutions. Server consolidation Storage consolidation Port consolidation Tape consolidation Distance. SAN Hardware. Switches and Hubs. FC-AL and Switching Fabric (non-blocking). FibreChannel. How SCSI Limitations are Addressed Speed Distance

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Storage Area Networks

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  1. Storage Area Networks CSE 8344

  2. What’s SANs CSE 8344

  3. SAN Solutions • Server consolidation • Storage consolidation • Port consolidation • Tape consolidation • Distance CSE 8344

  4. SAN Hardware CSE 8344

  5. Switches and Hubs FC-AL and Switching Fabric (non-blocking) CSE 8344

  6. FibreChannel • How SCSI Limitations are Addressed • Speed • Distance • Device Count • Access CSE 8344

  7. FibreChannel – Speed • 266 Mbps – ten years ago • 1063 Mbps – common in 1998 • 2125 Mbps – available today • 4 Gbps – near future products • Backward compatible to 1 & 2 Gbps • 10 Gbps – 2005? CSE 8344

  8. I/O Protocols over IP • IP Networking is ubiquitous • Gigabit ethernet is here • 10Gbps ethernet is just becoming available • Don’t have to invest in a second network • Just upgrade the one you have • IP & Ethernet software is well understood • Existing talent pool for vendors to leverage • Developers, not end-user Network Engineers CSE 8344

  9. FibreChannel – Distance • 1063 Mbps • 175m (62.5 um – multi-mode) • 500m (50.0 um – multi-mode) • 10 km (9 um – single-mode) • 2125 Mbps • 500m (50.0 um – multi-mode) • 2 km (9 um – single-mode) CSE 8344

  10. FibreChannel - Topology • Point-to-Point • Direct Connection of Server and Storage Node • Arbitrated Loop • Up to 126 Devices in a Loop via NL_Ports • Token-access, Polled Environment (like FDDI) • Fabric • Arbitrary Topology • Requires At Least One Switch • Up to 15 million ports can be concurrently logged in with the 24-bit address ID. • Dedicated Circuits between Servers & Storage • via Switches CSE 8344

  11. Other Features/Issues • Backup • LAN-free, server-less • Replication • Synchronous/Asynchronous • Server Clustering • Volume and File Management CSE 8344

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