<Insert Picture Here>

Infiniband enables scalable Real Application Clusters – Update Spring 2008 Sumanta Chatterjee, OracleRichard Frank, Oracle

What is Oracle Real Application Clusters (RAC) Database?

Instance 1 Instance 2 Instance 3 Instance 4

SGA 4SGA 1 SGA 2 SGA 3

Private Network

Public Network to Grid Computing Nodes

Database

…

• Multiple Instances• One Database• SGA database memory of all instances aggregated and appears as

one single database to applications through Cache Fusion.

RAC for SAP Benchmark ResultsScalability

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000

1 Node 2 Nodes 3 Nodes 4 Nodes 5 Nodes

0

5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000

Demonstrated Scalability Ideal (100%) Scalability

Advantages of RAC

• PerformanceIncrease performance of a RAC database by adding

additional servers to the cluster.

• Fault ToleranceA RAC database is made up of multiple instance.

While performance may degrade, loss of an instance does not bring down the entire database.

• ScalabilityScale a RAC database by adding instances to the

cluster database.

Shifting Trend in Deployment Paradigm

Monolithic SMP

•Application•Database

Database Tier

Application Tier on Commodity servers

Mixed Configuration•Commodity Application Servers•SMP Database Servers

Application Tier on Commodity servers

Database Tier on Commodity Servers

Grid Computing•All Commodity Servers

Past Present Future

Application and Database on Same SMP Server

Commodity Cluster Requires Unified Fabric for efficient scalable IPC +

Storage I/O

• RDS / IB shows significant real world application performance gains • 50% less CPU than IP over IB, UDP• ½ latency of UDP (no user-mode acks)• 50% faster cache to cache Oracle block throughput (ping)• Scales well beyond GE (600+ mbytes – ran out of CPU)• Minimal Oracle code change• Supports fail-over across and within HCAs• Certified for 16 nodes (64 processors)• GA in 10g r2 (10.2.0.3).

Current Status

• Several TPC-H benchmarks with RDS and SRP• Large scale deployments at several Oracle customer

sites. • Many pilot projects are in progress.• Folks waiting for RDS on OFED• 16 nodes Oracle 11G RAC certification of OFED

1.2.5.5 submitted for audit• Voltaire and Qlogic have completed platform

certification. Audit in progress.• Certification on Unix in progress

RDS- Communication model

• Works well with existing IPC clients—• Parallel Query communications• Buffer cache fusion

• Working on providing support for additional clients with RDMA plus atomic operations

• We expect significant performance improvements with RDMA

• With Atomics, even greater scalabilities and performance can be gained.

• Incentives for simple NICs to add RDMA + Atomics

RDS - evolution

• RDS v2 with b-copy send, rev in OFED 1.2.5.5• New features in RDS v3 available in OFED 1.3

• supports RDMA read + RDMA write• Introduces cmsgs for asynchronous operation submit and

completion notifications• Large data transfers – presently up to 1 MB. Will go up to 8

MB

RDS v4

• Plans for RDS v4• Masked fetch_and_add• Masked compare_and_swap• Zero copy completions via cmsg• RDS V4 will also be more portable - we will work to abstract

out the generic RDS operations from O/S primitive support and network operations. A platform that provides the O/S + network primitives library - should be able to take all the generic RDS code - as is.

RDS Compatibility

• Linux: request to all IB vendors—• Please ensure compatibility across HCAs, switches

• Ideally RDS driver in OFED ported to all platforms• Advantages include:• One code body– wider testing• Interoperability across platforms

• Towards this end, we plan to:• Abstract RDS protocol driver generically (OS, RDMA)