Transcript Optical Networks - Lyle School of Engineering

Storage Area Networks
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CSE 8344
What’s SANs
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SAN Solutions
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Server consolidation
Storage consolidation
Port consolidation
Tape consolidation
Distance
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SAN Hardware
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Switches and Hubs
FC-AL and Switching Fabric (non-blocking)
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FibreChannel
• How SCSI Limitations are Addressed
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Speed
Distance
Device Count
Access
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FibreChannel – Speed
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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?
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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
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FibreChannel – Distance
• 1063 Mbps
– 175m (62.5 um
– 500m (50.0 um
– 10 km (9 um
– multi-mode)
– multi-mode)
– single-mode)
• 2125 Mbps
– 500m (50.0 um
– 2 km (9 um
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– multi-mode)
– single-mode)
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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
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Other Features/Issues
• Backup
– LAN-free, server-less
• Replication
– Synchronous/Asynchronous
• Server Clustering
• Volume and File Management
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