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Oracle Tips by Burleson

Disk I/O Tuning

Chapter 4: RAID—Redundant Arrays of Inexpensive Disks 

load balancing, but write performance suffers due to RAID 6 requiring more writes than RAID 5 for data update.

For the money, I would suggest RAID0/1 or RAID1/0, that is, striped and mirrored. It provides nearly all of the dependability of RAID5 and gives much better write performance. You will usually take at least a 20 percent write performance hit using RAID5. For read-only applications RAID5 is a good choice, but in high-transaction/high-performance environments the write penalties may be too high. Figure 4-3 shows RAID 1-0 or 0-1 depending on whether you stripe and then mirror or mirror first and then stripe. In most situations you get better performance from RAID 1-0 (mirroring then striping.)

Figure 4-3: Mirroring and Striping

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

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