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Implementation and Evaluation of Iscsi Over RDMA Ethan Burns and Robert Russell

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Implementation and Evaluation of Iscsi Over RDMA Ethan Burns and Robert Russell Implementation and Evaluation of iSCSI over RDMA Ethan Burns and Robert Russell {eaburns,rdr}@iol.unh.edu University of New Hampshire InterOperability Laboratory 121 Technology Drive, Suite 2 Durham, NH 03824-4716 Goal ⊲ Goal Create an iSCSI implementation that makes use of Remote SCSI Direct Memory Access (iWARP) with the iSER extensions. iSCSI RDMA Evaluate the performance of the implementation. iSER Implementation Issues Uncovered Evaluation Future Work Questions 2 / 11 SCSI Goal Create an iSCSI implementation that makes use of Remote ⊲ SCSI Direct Memory Access (iWARP) with the iSER extensions. iSCSI RDMA Evaluate the performance of the implementation. iSER Implementation Issues Uncovered SCSI Evaluation Future Work iSCSI Questions iSER RDMA/iWARP TCP IP Ethernet 3 / 11 SCSI Goal Create an iSCSI implementation that makes use of Remote ⊲ SCSI Direct Memory Access (iWARP) with the iSER extensions. iSCSI RDMA Evaluate the performance of the implementation. iSER Implementation Issues Uncovered Small Computer System Interface Evaluation Architecture for connecting peripheral devices to computers Future Work Questions Client/Server: – Initiator (Client) – Target (Server) Traditionally an internal parallel SCSI bus Limitations on number of devices and cable length 3 / 11 iSCSI Goal Create an iSCSI implementation that makes use of Remote SCSI Direct Memory Access (iWARP) with the iSER extensions. ⊲ iSCSI RDMA Evaluate the performance of the implementation. iSER Implementation Issues Uncovered SCSI Evaluation Future Work iSCSI Questions iSER RDMA/iWARP TCP IP Ethernet 4 / 11 iSCSI Goal Create an iSCSI implementation that makes use of Remote SCSI Direct Memory Access (iWARP) with the iSER extensions. ⊲ iSCSI RDMA Evaluate the performance of the implementation. iSER Implementation Issues Uncovered Internet Small Computer System Interface Evaluation Future Work – RFC3720 (2004) Questions A solution to the scalability issues of traditional SCSI A transport for SCSI commands and data over TCP/IP Two phases – Login Phase – for negotiating connection parameters – Full Feature Phase – for data transfer 4 / 11 RDMA Goal Create an iSCSI implementation that makes use of Remote SCSI Direct Memory Access (iWARP) with the iSER extensions. iSCSI ⊲ RDMA Evaluate the performance of the implementation. iSER Implementation Issues Uncovered SCSI Evaluation Future Work iSCSI Questions iSER RDMA/iWARP TCP IP Ethernet 5 / 11 RDMA Goal Create an iSCSI implementation that makes use of Remote SCSI Direct Memory Access (iWARP) with the iSER extensions. iSCSI ⊲ RDMA Evaluate the performance of the implementation. iSER Implementation Issues Uncovered Remote Direct Memory Access Evaluation Typical CPU becomes bottleneck with 10GigE Future Work Questions – Data copying – Network interrupts – Packet processing Zero-copy data transfers Offloads network processing Makes full utilization of a 10GigE link iWARP protocol suite provides RDMA over TCP/IP – RFC5040 (2007), RFC5041 (2007), RFC5044 (2007), ... 5 / 11 iSER Goal Create an iSCSI implementation that makes use of Remote SCSI Direct Memory Access (iWARP) with the iSER extensions. iSCSI RDMA Evaluate the performance of the implementation. ⊲ iSER Implementation Issues Uncovered SCSI Evaluation Future Work iSCSI Questions iSER RDMA/iWARP TCP IP Ethernet 6 / 11 iSER Goal Create an iSCSI implementation that makes use of Remote SCSI Direct Memory Access (iWARP) with the iSER extensions. iSCSI RDMA Evaluate the performance of the implementation. ⊲ iSER Implementation Issues Uncovered iSCSI Extensions for RDMA Evaluation Future Work – RFC5046 (2007) Questions Allow iSCSI to use RDMA hardware Translate and encapsulate iSCSI over RDMA Transition from streaming TCP to RDMA enabled – Negotiate use of iSER during iSCSI negotiation phase – Transition to RDMA mode before iSCSI data transfer phase 6 / 11 Implementation Goal SCSI iSCSI RDMA iSER ⊲ Implementation Issues Uncovered Evaluation Future Work Questions 7 / 11 Implementation Goal Extend UNH-iSCSI to support the iSER extensions SCSI iSCSI – Set of Linux kernel modules RDMA – Created and supported at UNH ⊲iSER Implementation Issues Uncovered Use the OpenFabrics Alliance Stack Evaluation Future Work – Access to RDMA hardware Questions – Included in Linux kernel – Provides a user-space API Create both a kernel-space and user-space solution 7 / 11 Issues Uncovered Goal Current RDMA hardware does not support TCP stream SCSI transitioning iSCSI RDMA iSER Bring up connection in RDMA mode Implementation ⊲ No run-time selection for iSER v.s. traditional iSCSI Issues Uncovered Evaluation Additional iSER operational primitives for connection Future Work establishment Questions 8 / 11 Issues Uncovered Goal Standard iSER header for iWARP does not contain fields for all SCSI data required by current hardware. iSCSI RDMA iSER We added additional iSER header fields to advertise missing Implementation information ⊲ Issues Uncovered Evaluation Future Work Questions 8 / 11 Issues Uncovered Goal SCSI iSCSI RDMA iSER Implementation ⊲ Issues Uncovered Evaluation Future Work Questions 8 / 11 Evaluation Goal MEMORYIO mode (on the target) SCSI iSCSI Four 2.6GHz Intel 64-bit cores RDMA 4GB main memory iSER Implementation Chelsio R310E-CXA 10Gigabit Ethernet iWARP adapters Issues Uncovered ⊲ Evaluation Future Work Questions 9 / 11 Evaluation Goal Kernel-Space iSCSI Reads Over 10 Gigabit Ethernet SCSI 10000 iSCSI RDMA iSER 8000 Implementation ⊲Issues Uncovered Evaluation 6000 Future Work Questions 4000 2000 Theoretical Max RDMA Throughput (9363 Megabits/sec) Throughput (Megabits/second) iSER-assisted iSCSI Over iWARP/TCP Traditional (Unassisted) iSCSI Over TCP 0 0.1 1 10 Size (Megabytes) 9 / 11 Evaluation Goal Kernel-Space iSCSI Writes Over 10 Gigabit Ethernet SCSI 10000 iSCSI RDMA iSER 8000 Implementation ⊲Issues Uncovered Evaluation 6000 Future Work Questions 4000 2000 Theoretical Max RDMA Throughput (9363 Megabits/sec) Throughput (Megabits/second) iSER-assisted iSCSI Over iWARP/TCP Traditional (Unassisted) iSCSI Over TCP 0 0.1 1 10 Size (Megabytes) 9 / 11 Evaluation Goal User-Space iSCSI Writes Over 10 Gigabit Ethernet SCSI 10000 iSCSI RDMA iSER 8000 Implementation ⊲Issues Uncovered Evaluation 6000 Future Work Questions 4000 2000 Theoretical Max RDMA Throughput (9363 Megabits/sec) Throughput (Megabits/second) iSER-assisted iSCSI Over iWARP/TCP Traditional (Unassisted) iSCSI Over TCP 0 0.1 1 10 Size (Megabytes) 9 / 11 Future Work Goal Further Performance Evaluation SCSI iSCSI – Response time RDMA iSER – CPU utilization Implementation Issues Uncovered Further Comparisons Evaluation ⊲ Future Work – Infiniband Questions – TCP offloading – iSCSI offloading iSCSI Parameters – Immediate/Unsolicited data – Multiple outstanding commands – Multiple connections 10 / 11 Questions Goal Source Available at: SCSI http://sourceforge.net/projects/unh-iscsi iSCSI RDMA iSER Implementation Issues Uncovered Evaluation Future Work ⊲ Questions 11 / 11.
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