Advanced FCoE: Extension of Fibre Channel over Ethernet
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1 XX 事業本部 YY 殿 rd Workshop on Data Center Converged and Virtual Ethernet Switching DC CaVES 2011 Advanced : Extension of Fibre Channel over Ethernet September 9, 2011 Satoshi Kamiya, Kiyohisa Ichino, Masato Yasuda, Noriaki Kobayashi, Norio Yamagaki and Akira Tsuji NEC Corporation (kamiya@ak.jp.nec.com) This work was partly supported by Ministry of Internal Affairs and Communications (MIC), Japan.
2 Outline Background: Issues of Proposed Architecture: Advanced Prototype Implementation and Evaluation Page 2 Sept , DC CaVES 2011 NEC Corporation 2011
3 Background In data centers, there is a movement of I/O consolidation and Network Convergence For Reduction of CAPEX and OPEX Network Convergence :LAN (Ethernet) and SAN (IP-SAN, ) Separate Network Converged Network Internet terminals storage Internet terminals storage LAN (TCP) SAN (Fibre Channel: FC) Converged DC transport Converged Enhanced Ethernet servers servers Page 3 Sept , DC CaVES 2011 NEC Corporation 2011
4 for LAN/SAN Convergence Simple Protocol Roadmap toward High-speed Ethernet (40G~100G) Operating System / Applications SCSI Layer FCP iscsi FCP FCP FCP FCIP ifcp TCP TCP TCP IP IP IP FC Ethernet DCB 1,2,4,8G 1,10,40,100G Page 4 NEC Corporation 2011 Sept , DC CaVES 2011
5 System Consists of 4 components : Initiator (Server), Target (Storage), FCF ( Switch), DCB Switch Forwarder (FCF) Initiator DCB Switch Lossless Ethernet Virtual FC Link Physical Ethernet Link Target DCB : Data Center Bridging (specified in IEEE DCB WG) Page 5 Sept , DC CaVES 2011 NEC Corporation 2011
6 Protocol Sequence Initiator DCB Switch FCF DCB Switch Target DCBX Exchange messages between adjacent devices Discovery, Fabric Login, Port Login Port/Process Login SCSI-FCP Send frames Receive frames Forward frames w/o modification Forward frames with modification Page 6 Sept , DC CaVES 2011 NEC Corporation 2011
7 Frame Forwarding Discovery, Fabric Login, Port Login Port/Process Login SCSI-FCP Forwarder (FCF) Initiator Lossless Ethernet DCB Switch Virtual FC Link Physical Ethernet Link All traffic goes through FCF Target Page 7 Sept , DC CaVES 2011 NEC Corporation 2011
8 Technical Issues of and Solution Scalability Limitation Go through all traffic in FCF. FCF is bottle neck point in the system. Hard to scale Solution: Separate U-plane and C- plane function in to realize virtually large-scale L2 Switch and scale-free system. Initiator DCB Switch FCF DCB Switch Target Performance Degradation by Data Loss DCB does not support to retransmit and reorder frames. If frame loss occurs, SCSI-level timeout is long (>1sec). Page 8 Sept , DC CaVES 2011 NEC Corporation 2011 Solution: Dataloss concealment using Datacenter Transport technologies (retransmission:r2d2, Packet order management)
9 Proposed Architecture Advanced (A) U/C Separation Separate U-plane traffic (SCSI-FCP frames) and C-plane traffic (other frames) Flat Data Transport Network by Using L2 Address Forward frames according to Ethernet MAC addresses Large scalability Reliable Ethernet Transport: Edge based reliable Ethernet instead of lossless Ethernet provided by DCB Fast retransmission function and reordering function into Ethernet layer Avoid performance degradation by data loss Reduce CAPEX by using legacy Ethernet switches Page 9 Sept , DC CaVES 2011 NEC Corporation 2011
10 Advanced (A) Architecture Consists of 4 components; (1)initiator, (2) target, (3) FCC, and (4) switch Fabric Controller (FCC) Ethernet network Initiator Target Switch (Legacy Ethernet) U/C separation Retransmission Reordering Virtual FC Link Physical Ethernet Link Page 10 Sept , DC CaVES 2011 NEC Corporation 2011
11 Features of A U/C Separation between User-data and Control-data 1) U-plane / C-plane separation Fabric Controller (FCC) Fabric Controller : Processing c-plane and m- plane of Ethernet network Initiator Target Switch (Legacy Ethernet) Retransmission - Use legacy Ethernet Virtual FC network Link & Reorder - No need Physical switch Ethernet Link 2) Edge-based Reliable Ethernet Transport Page 11 Sept , DC CaVES 2011 NEC Corporation 2011
12 A Protocol Sequence Initiator VN_port Switch FCC Switches Switch Target VN_port C-plane DCBX Exchange messages between adjacent devices Discovery, Fabric Login, Port Login Port/Process Login SCSI-FCP U-plane Cut through Forwarding only via Switches Send frames Receive frames Forward frames w/o modification Forward frames with modification Page 12 Sept , DC CaVES 2011 NEC Corporation 2011
13 A Frame Forwarding (1) MAC:A MAC:FCC MAC:X MAC:FCC MAC:FCC MAC:A MAC:FCC MAC:X FCC Discovery, Fabric Login, Port Login Ethernet network Server A Storage X Server B Switch (Legacy Ethernet) Virtual FC Link Physical Ethernet Link Storage Y Page 13 Sept , DC CaVES 2011 NEC Corporation 2011
14 A Frame Forwarding (2) MAC:A MAC:FCC MAC:X MAC:FCC MAC:FCC MAC:A MAC:FCC MAC:X Address Conv. FCC Port/Process Login Ethernet network Server A Storage X Server B Switch (Legacy Ethernet) Virtual FC Link Physical Ethernet Link Storage Y Page 14 Sept , DC CaVES 2011 NEC Corporation 2011
15 A Frame Forwarding (3) MAC:A MAC:X MAC:X MAC:A Read Address from X Conv Dst MAC FCC X. FCC SCSI-FCP Address Read Data Conv to A Ethernet network Dst MAC FCC A. Server A Cut through Forwarding only via Switches Storage X Server B Switch (Legacy Ethernet) Virtual FC Link Physical Ethernet Link Storage Y Page 15 Sept , DC CaVES 2011 NEC Corporation 2011
16 Edge-based Reliable Ethernet Transport Fast Retransmission and Reordering Function instead of DCB R2D2 : Rapid Reliable Data Delivery - Rapid Retransmission technology Conceal packet loss Reordering Packet reordering function Easy to Implementation Enable low cost NIC. No change switch. R2D2 System Diagram 3 1 Layer 3 (IP) Sending queue 5 2 Layer 2.5 (R2D2) L3 Data Add R2D2 Header Set sequence number Calculate checksum Note: No per-flow state Seq# 1 4 R2D2 Header L3 Data Tx Queue Wait Queue Process R2D2 ACK Get sequence number Remove packet copy from wait queue R2D2 ACK Layer 2(Ethernet) Page 12 NEC Confidential [Ref] B. Atikoglu, M. Alizadeh, J. S. Yue, B. Prabhakar and M. Rosenblum, R2D2: Rapid and Reliable Data Delivery in Data Centers, April 2010, Page 16 Sept , DC CaVES 2011 NEC Corporation 2011
17 Prototype Implementation Gigabit Ethernet U/C Separation Network Fast Retransmission FCC C-plane frame D-plane frame CNA Server Gateway Switch Page 17 Sept , DC CaVES 2011 NEC Corporation 2011 Gateway Storage Equipment Vendo r,model OS Server IBM x3650 M2 XeonQuadcore2.53GHz RHEL5.3(32bit) (CNA:QlogicQLE8142-SR) 4GB Storage NetAppFAS3140 ONTAP7.3.2P5 Mobil ecelelon2.2ghz 4GB(NVRAM 512MB) Switch NECQX-S5828 T - Gateway NECMateMY33A/E7 CentOS5.5(64bit) Core2Duo3.33GHz4GB FCC NECMateMY24A/B4 Fedora13(32bit) Core2Duo2.4GHz2GB We confirmed the whole sequence of A.
18 Performance Evaluation: Reliable Ethernet in A Reliable Ethernet improves throughput under lossy situation Throughpu t Mbps] [ Retransmission:OFF D-plane line speed: 1000Mbps Packet drop rate: 1% (random drop) FC link timeout: 10 seconds Retransmission timeout: 100 micro seconds Page 18 Sept , DC CaVES 2011 NEC Corporation 2011 Retransmission:ON Experimental Condition BlockSize[MB]
19 Comparison between A and FC-BB-6 A does not need FDFs (FC-aware switches). A makes network simple and flat compared to FC-BB-6. A FC-BB-6 FCC FCF FDF U/C separation DCB support L2 SW or DCB SW U/C separation Retransmission Reordering DCB SW DCB support Page 19 Sept , DC CaVES 2011 NEC Corporation 2011
20 Next Enhancement: OpenFlow-based A System - LAN/SAN unified management with OpenFlow - Makes (SAN) network more efficient : - Multi-path setup for redundancy and bandwidth - Rapid reroute in network failure Fabric Management FCC Transmits FPMA Route setup Administration control etc. OpenFlow Controller Initiator OpenFlow Switches Virtual FC Link Physical Ethernet Link Target Page 20 Sept , DC CaVES 2011 NEC Corporation 2011
21 Conclusion Advanced (A) has been proposed Enhanced system Addresses s issues: Scalability and performance degradation Confirmed correct operations of basic A system Future Work Evaluations in more complex network OpenFlow-based A system Page 21 Sept , DC CaVES 2011 NEC Corporation 2011
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