SCTP Handoff for Cluster Servers

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Read this to find out how the internet works!

Presentation transcript:

SCTP Handoff for Cluster Servers Sponsored By : Dreamz Group External Guide : Mr. Nitin Kumbhar Internal Guide : Prof. R. B. Ingle & Prof. Geetanjali Kale Paresh Bafna Amit Khanna Zaki Mulla PICT (Pune Institute of Computer Technology)

Introduction Data intensive services Why Clusters ? E.g. Web, FTP, Multimedia Why Clusters ? Cost effectiveness Scalability Security Optimized servers Fault tolerance

SCTP in Clusters Multistreaming Multihoming Security No multiple connection overhead No Head-of-Line Blocking problem Better response times Multihoming Partial network failure tolerance Security

Current Scenario Proxy Clients Gateways Server Cluster Server 1 Server n Internet Proxy Clients Gateways Server Cluster Request Response

Problems In The Existing Scenario Context Switch + Data Copying Context Switch + Data Copying User Kernel Client Server Proxy

Problems In The Existing Scenario 3 Data Buffers Data copying between kernel and user-space buffers User-kernel context switches Interrupts Bottleneck at proxy Reduced scalability Number of Clients X

Proposed Mechanism Client Server 1 Server 2 Proxy Server n Gateways Internet Proxy Server n Gateways Server Cluster Request Response

Handoff Mechanism Split stack Client Proxy Server Synchronization information - IP, port, vtag, Seq No… Client Proxy Server Content Aware Dispatcher Load Balancer Sync Req Data

Architecture Server Cluster Proxy Server To client Handoff Server Web User Handoff Server Kernel Resource Utilization Daemon Load Balancer Handoff Client Plug-in SCTP Hand Off Layer Content- aware Dispatcher Proxy Server Request or Acknowledgement packet Response packet

Implementation overview Proxy Content-aware-dispatcher Rule based Load balancer Create an association with each server Handoff client Hook SCTP packets from clients Maintain Sync info Send Sync info to server Forward packet to server

Implementation overview (contd) Server Resource utilization daemon Free Memory, CPU idle time, Live associations Handoff server Extract and interpret sync info Replicate half stack on server

Marketability No client side changes needed Generic … Web portal Web server FTP Multimedia server Centralized administration

Demo Setup Client Proxy Server IP addr – 10.10.4.227 H/W addr – 00:50:BA:3D:92:1C Proxy IP – 10.10.4.241 H/W addr – 00:50:BA:3D:92:22 Server IP – 10.10.4.201 H/W addr – 00:50:BA:3E:96:F7

Implementation Features Generic Servers vs Services Includes load balancing and content-aware dispatching Completely inside kernel

Performance Current Scenario Proposed mechanism Improvement Data Buffers 3 1 66.6% Context switches 2 100% Stack traversals 6 4 33.3% Interrupts CPU utilization at proxy Response/ request ratio Improvement 1 50% 2 66.6% 3 75%

Thank You !