Range Extension Sonoma’06 David Southwell, Jason Gunthorpe – Obsidan Linden Mercer – Naval Research Labs Bill Boas – OpenIB/ SC|05.

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Presentation transcript:

Range Extension Sonoma’06 David Southwell, Jason Gunthorpe – Obsidan Linden Mercer – Naval Research Labs Bill Boas – OpenIB/ SC|05

Feb 6th 2006Sonoma'062 Background Encapsulating IB over WANs – concept established at Naval Research Labs, D.C. Developed into prototypes shown at SC|04 by team now known as Obsidian Integrated with SCinet/OpenIB fabric at SC|05, connecting Seattle to Dupont, Livermore and Washington D.C.

Feb 6th 2006Sonoma'063 Longbow prototype Appears on IB fabric as a two-port switch 1.4x SDR CX-4 copper port 2.OC-192c SONET optical WAN port

Feb 6th 2006Sonoma'064 Longbow WAN port Physical layer is not IB conformant, but… …at the link layer has all the required IB attributes with sufficient credits to span very long distances (> circumference of Earth) Interoperates with subnet managers; remote fabric islands unify into a single large subnet

Feb 6th 2006Sonoma'065 Production – Longbow XR Integrates IB router function Tentative support for ATM+10GbE WANs HA architecture

Feb 6th 2006Sonoma'066 Technical issues… 1.Upper Level Protocols 2.Queue Pair timeouts 3.Router support 4.Heterogeneous fabrics

Feb 6th 2006Sonoma' Upper Level Protocols ULPs are built around an assumption of inexpensive round-trip signaling ULPs with RDMA reads tend to use three phase exchanges… …65 milliseconds across the country

Feb 6th 2006Sonoma' Upper Level Protocols ? Rely on custom & proprietary ULPs for long haul applications ? ? Develop new ULPs for efficient long haul IB transport ?

Feb 6th 2006Sonoma' Queue Pair timeouts Long haul links must be accommodated by Queue Pair timeout settings Reliant on manual timeout fudging unless the 1.2 specification’s SM link latency measurement and automatic timeout adjustment mechanism is widely deployed…

Feb 6th 2006Sonoma' Router support Router function routes on IPv6 headers, with LID path and caching… …Subnet manager must be configured with a routing table; applications must be looking up with IPv6 GIDs, not LIDs…

Feb 6th 2006Sonoma' Heterogenous fabrics Long haul merges vendor – homogeneous sites into possibly heterogeneous multi- site subnets Important that interoperability testing supports such configurations!

Feb 6th 2006Sonoma'0612 Evaluation Opportunities… Global data center replication Native IB supercomputer GRID connectivity Remote IB storage Campus/ Metro area IB clustering Remote visualization applications Streaming media transport