Call for Oracle support & training (800) 766-1884
Free Oracle Tips

Corporate Oracle Training
Custom Oracle Training
Oracle New Features Training
Advanced Oracle DBA Classes
Oracle Tuning Courses
Oracle Tips & Tricks
Oracle Training Links
Oracle Training Links
Oracle Training Links

We are top for USA Oracle Training Clients


Free Oracle Tips


Free Oracle App Server Tips


Oracle support

Oracle training

Oracle tuning


Remote Oracle

Custom Oracle Training

Donald K. Burleson

Oracle RAC Tips

Multiple RAID Controllers and Storage Processors

RAID Controllers are the units in a storage array that control the RAID operations. They present one or more virtual devices (or LUNS) to the host system and distribute the I/O operations to the member disks. With the help of a RAID utility, the physical disks are grouped and formed into LUNS (logical units). The LUN is the basic storage unit presented to the host system for its use.

It is also responsible for maintaining the mapping between the virtual device and individual disks in the array. The existence of a RAID controller makes a JBOD array into a RAID Storage Array. RAID Controllers are also used in parallel access arrays for improving the I/O performance. Any failure in the RAID controller cripples the total functionality of the storage array.

Many of the storage arrays offer intelligent storage processors, which control the RAID activity on the array. The storage processor is the RAID controller for the storage array. In many arrays, there is a local cache to handle the data movement along with storage processors. Dual caches or battery-backed caches help with protection and provide additional redundancy. (See Fig 5.4)

Fig 5.4 Redundant RAID controllers

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.





Oracle performance tuning book



Oracle performance tuning software

Oracle performance tuning software
Oracle performance Tuning 10g reference poster
Oracle training in Linux commands
Oracle training Excel
email BC:

Copyright © 1996 -  2014 by Burleson Inc. All rights reserved.

Oracle® is the registered trademark of Oracle Corporation.