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Oracle Tips by Burleson

Disk I/O Tuning

Chapter 4: RAID Technology

Unless you’ve been living in seclusion from the computer mainstream, you will have heard of disk striping, shadowing, and RAID. Let’s take a brief look at them and how they are used in Oracle.

Disk Striping 

Disk striping is the process by which multiple smaller disks are made to look like one large disk. This allows extremely large databases, or even extremely large single-table tablespaces, to occupy one logical device. This makes managing the resource easier since backups only have to address one logical volume instead of several. This also provides the advantage of spreading I/O across several disks. If you will need several ten's or hundreds of gigabytes of disk storage for your application, striping is the way to go. One disadvantage to striping: If one of the disks in the set crashes, you lose them all unless you have a high-reliability array with hot swap capability. Striping is RAID 0.

Figure 4-1 shows an example of 4 disks using 3 stripes per disk. This allows larger logical disks that would be allowed from a single disk. It also spreads the data across more platters allowing a higher IO rate. All of the stripe 1 slices form one logical disk, as do all of the stripe 3 slices and the stripe 3 slices, so we have created 3 larger logical disks with 4 times the possible IO rate of any of the disks individually.


The above text is an excerpt from:

Oracle Disk I/O Tuning
Disk IO Performance & Optimization for Oracle Databases
ISBN 0-9745993-4-4 

by Mike Ault
 


Oracle Consulting Services

Burleson Oracle Consulting offers Senior Oracle consultants which are available for all areas of Oracle support.  Common Oracle consulting support activities include short-term Oracle tuning, Oracle database troubleshooting, Oracle9i and Oracle10g migration, Oracle9iAS App Server consulting, Oracle design reviews and Oracle requirements evaluation support. Oracle support and Oracle consulting services are priced by the hour, so you only pay for what you need. These one-time Oracle consulting services commonly include:

  • Answering questions from your Oracle DBA technical staff

  • Repairing down production Oracle database systems

  • One-time Oracle tuning evaluation

  • Guru support for your Oracle DBA

  • Installation of Oracle application packages

For more information, please visit www.rampant-books.com

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