ISCSI vs iSER vs SRP over Ethernet or InfiniBand

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Overview

ISCSI vs iSER vs SRP over Ethernet or InfiniBand에 대한 기술 문서입니다.

Summary

  • 무엇인가? - ISCSI vs iSER vs SRP over Ethernet or InfiniBand
  • 왜 필요한가? - HPC 및 서버 환경에서 필수 개념
  • 언제 사용하는가? - 서버 구성, 성능 튜닝, 문제 해결 시


Purpose

이 문서가 존재하는 이유

  • Goal: ISCSI vs iSER vs SRP over Ethernet or InfiniBand에 대한 기술 정보 제공
  • Scope: ISCSI vs iSER vs SRP over Ethernet or InfiniBand의 개념, 사용법, 설정
  • Non-goals: 다른 주제로의 확장


Key Concepts

Concept Description Related
ISCSI vs iSER vs SRP over Ethernet or InfiniBand HPC/서버 환경에서 중요한 기술 개념 Linux, Server


Detailed Explanation

In brief - iSER on InfiniBand closed the gap with SRP in some point, it is now showing higher performance

Iservssrp.png

Stands for "SCSI RDMA Protocol", SRP was first published as a standard in 2002. It's very mature and completely stable. Typical usage is connecting head nodes with storage nodes so we can build large (and small) ZFS based clusters (RDMA based SCSI over InfiniBand) . It works beautifully with ZFS since each SRP disk works exactly as if it was plugged directly into the head node. In fact, even better: because the disk is served by a target, we can do SCSI-3 persistent reservations on the disks. Getting it to work on an Ethernet network would be very difficult. Target support is provided by SCST and LIO on Linux, and COMSTAR on Solaris/illumos based systems. SRP was first published as a standard in 2002. It's very mature and completely stable Stands for "iSCSI Extensions for RDMA". It basically extends the iSCSI protocol to include RDMA support. Unlike SRP, you can run it on Ethernet.You can use the same software as IP based iSCSI. You just configure the initiator side to use an iSER interface when performing iSCSI discovery. You don't need to learn anything new. As long as your hardware, initiator and target support iSER, it will work. Target support is provided by SCST and LIO on Linux, and COMSTAR on Solaris/illumos based systems. The protocol specifications were first published in 2004. Like SRP, it is very mature and completely stable


Best Practices

  • 최신 버전 사용 권장
  • 공식 문서 참고
  • 테스트 환경에서 먼저 검증


References


Related Pages

Knowledge Graph

Related

→ Linux → Server → Hardware → Network

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