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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Designing Equipment for Real Application Clusters

In addition, the SAN, perhaps a SUN T3, Hitachi or EMC Clariion or Symmetrix, can be configured using redundant disk configurations such as RAID-1, RAID5, or a combination (sometimes called "plaid") of RAID1 and RAID5 that virtually eliminates downtime from the loss of a single disk. However, it should be stressed that application performance can suffer horribly from a disk failure during a disk rebuild with installed spares or a rebuild of the information using parity information from the other disks in a RAID5 set.

What are the effects of component failure? Let's take a quick look at the effects of component failure.

Failure of the Internet or Intranet

While not a component that a DBA usually has control over, failure of the Internet connection (usually due to the provider having a failure) means no one outside the company can access the application. Failure of the intranet or internal networks means no one inside the company can access the application. These components (usually comprised of multiple components) should also have built in redundancy.

Failure of the Firewall

The firewall acts as the gatekeeper between the company’s assets and the rest of the world. If the database is strictly internal (no connection to the web), then a firewall is not needed. If there is only one firewall, a failure will prevent anyone outside the firewall (i.e., the rest of the universe) from contacting the database. Internal users may still have access (those "inside" the firewall) and some limited processing can occur.

For more information, see the book Oracle 11g Grid and Real Application Clusters 30% off if you buy it directly from Rampant TechPress . 

Written by top Oracle experts, this RAC book has a complete online code depot with ready to use RAC scripts.

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Our remote Oracle DBA service provides 100% of the remote Oracle database administration needs for your company, and includes 24x7 access to our staff of 100% OCP Certified Oracle DBAs. 

We require a 12 month service commitment and include the following services:

  • Initial configuration review and problem identification
  • Installation of Oracle statistics collection mechanisms and quarterly database growth summaries
  • Hourly monitoring of your Oracle database for pending problems
  • Periodic performance analysis & identification of tuning activities
  • Twenty Four hour Oracle emergency support
  • Reporting and resolving all serious Oracle alert log messages
  • Free use of the BC TablePack, ServerPack and AuditPack services
  • Quick response emergency support for production database outages
  • Four hours of free remote DBA support every month. You can use these free hours for any DBA activity, including database analysis, system design, production migrations or personal mentoring.

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