Fibre Channel, FCOE and FCIP: Oh My!
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Transcript of Fibre Channel, FCOE and FCIP: Oh My!
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1© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 1
Fibre Channel, FCoE, and FCIP: Oh My!Evaluating Storage Protocols in Distance SolutionsJ Metz, Ph.D – Sr. Product Manager
@drjmetz
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Distance
What do I need to know about storage distance?
How far can I go?
Am I using the right tool for the job?
2© 2013 Cisco and/or its affiliates. All rights reserved.Storage Distance by Protocol Cisco Public
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Don't miss out on any of them!
Know your physical layer
Know your protocol
Know your limitations!
Three Major Things
3© 2013 Cisco and/or its affiliates. All rights reserved.Storage Distance by Protocol Cisco Public
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Let's Get Physical!
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How to Differentiate?Optics
Fibre Channel Optics
Ethernet Optics-Yes, can transmit Fibre Channel too!
Speed
Power (i.e., Strength)-Translates to distance
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Distance Requires Specialized SolutionsOptics
SFP-Up to 4Gbps
SFP+-8 Gbps+
Longer distances often mean lower throughput speeds
km
1 km
5 km
10 km
40 km
100 km
FC-SR
Eth-SR
FC-MR
FC/Eth-LR
FC/Eth-ER
300m
860m
4 km
CWDM DWDM
10 km
40 km
100 km
2000+ km
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Single Mode Fibre
Multimode Fibre
Three Major TypesCables
Copper-based-Generally not suitable for distances greater than 30m-So... not a "long-distance solution"
Optical-SMF: "Single Mode Fibre"
-Small diameter core-Allows only one mode of light to be sent-Longer effective distance - 100 km or less-Need transceivers that have more power
-MMF: "Multi-Mode Fibre"-Larger diameter core-Allows multiple paths (modes) to be sent at the same time-Shorter effective distance - around 16 km or less-Generally uses cheaper equipment and easier to interconnect-Good for general purpose applications (e.g., campus, building deployments)-Often orange in color
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The Dark And Mysterious ForceDark Fibre
Cabling laid out by telecommunication companies that isn't being used (dark vs. 'lit')
Leased lines to companies who wish to communicate over great distances
Follows same rules as we've already gone over
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Use The Proper Protocol
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It's All About the SourceFibre Channel (FC)
Fibre Channel is a source-based mechanism for lossless delivery
Buffer to buffer (B2B) credits keep FC frames in order
1 buffer = 1 frame
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Mo' Buffers Mean Mo' DistanceFC Distance
Longer distances require more time to receive acknowledgements
(Very expensive to not use a pipe)
Ports can "donate" buffer credits to other ports
Can send more data before acknowledgement
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On the Receiving EndFibre Channel over Ethernet (FCoE)
FCoE is a receiver-based mechanism for lossless delivery
Receiving switch has a "high water mark"
Includes frames already "in the bucket" as well as frames in flight.
When threshold is reached, PAUSE frame is sent (IEEE 802.1Qbb)
Distance is proportional to receiver capability
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Go Long! No, Even Longer!Fibre Channel over IP (FCIP)
Other alternatives include running over lossy links
-No buffer credits-No Priority Flow Control
Usually done over 1GbE links
Acceleration tools (like IOA) are available
Best of both worlds:-Uses IP infrastructure and management resources to connect and extend FC SANs-Keep high-performance SAN base; whilst increasing data sharing between SANS transparently
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