Sql Server On A Cluster

SQL Server on a Cluster Experiences Mike FITZSIMON SYSTEMS ARCHITECT F ITZSIMON IT C ONSULTING PTY LTD

Why use SQL Server on a Cluster?
High Availability
Fault Tolerance (?)
Failback
Manageability
Scalability (?)

Hardware Architecture – Single Tier
Web Server
Business Logic COM Components
SQL Server

Hardware Architecture – Two Tier SQL Server Database Server Web Server Business Logic COM Components

Hardware Architecture – Three Tier SQL Server Database Server Business Logic COM Components Web Server

Hardware Architecture – Scalable Three Tier
SQL Server Database Server
Application Server Farm Web Server Farm

H/w Architecture - OzEvents.com
Router distributes http requests
2-Server Web Farm (Test site on one server)
SQL Server (Production & Test databases)
Exchange Server

Hardware Architecture – Scalable Three Tier
SQL Server Database Server
Single point of failure?
Application Server Farm Web Server Farm

Hardware Architecture - Cluster Server
Two or more Servers
Private LAN (heartbeat, <500ms ping)
Shared SCSI bus (separate to System SCSI bus)
Applications & Data on RAID
Server A Server B LAN Private LAN RAID Applications & Data Shared SCSI SCSI SCSI

IMS Locations Brisbane Sydney Melbourne
Cluster Servers in each State Office
Frame Relay Service

High Availability Cluster Servers
IBM Netfinity 5500 Servers
Physical machines named eaven and ell
Virtual machines named neSQL and neIIS
Required 4 IP addresses !

RAID-1 Mirrored internal disk drives
Can be used as an emergency backup during a system upgrade

External RAID array
StorageTek
Raid-1 9Gb Quorum Disk (persistent arbitration)
Raid-5 18 Gb Data disks

External RAID array:
Dual Power supplies Dual Network adaptors

Hardware Architecture - Cluster Server
Normal Active/Active configuration
Server A: IIS & MTS Resource Groups
Server B: SQL Resource Group
Web pages and SQL MDF files on RAID
Server A Server B LAN Private LAN RAID Applications & Data Shared SCSI SCSI SCSI

Multi-Node Clusters
Still need only two NICs per machine (one for public network, one for private network)
Need a Hub
To support at least 4-nodes, need Windows Server 2003 Enterprise Edition or Windows Server 2003 Datacenter Edition
Windows Clustering is installed by default; configure a cluster by starting Cluster Administrator or Cluster.exe

Writing your own Cluster-Aware Application
LooksAlive (By default, SQL calls this every 5 seconds)
IsAlive (By default, SQL calls this every 60 seconds)

Clustering Resources
Quorum Drive Configuration Information http://support.microsoft.com/?id=280345
Available Features in Windows Server 2003 Clusters http://support.microsoft.com/?id=278007
Step by step guide to install a 2000 Cluster: http://www.microsoft.com/windows2000/techinfo/planning/server/clustersteps.asp

Questions
Mike Fitzsimon [email_address]
This ppt available from www.fitzsimon.com.au/qmsdnug

Sql Server On A Cluster

by Lohit Ahuja

Accessibility

Upload Details

Usage Rights

1 Embed 1

Statistics

Sql Server On A Cluster Presentation Transcript