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Oracle Disk I/O Tuning

Chapter 5:

ASM Disk Groups

For files, such as log files, that require low latency, ASM provides fine-grained (128k) striping to allow larger I/Os to be split and processed in parallel by multiple disks. At file creation time, you can decide whether or not to use fine-grained striping. File type specific templates in the disk group determine the default behavior.

Most installations will probably have two or more disk groups. The reasons for having multiple different disk groups include the following:

  • To group disks of different manufacturers, different sizes or performance characteristics.
     

  • To group disks with different external redundancy together; for example, JBOD (just a bunch of disks) would generally not be in the same disk group with disks from a RAID 1+0 or RAID5 configuration, but this is possible using ASM.
     

  • To separate work and recovery areas for a given database.

Note: In any installation, non-ASM managed operating system storage repositories are required, and are used for swap files, execution libraries, and user file systems. The Oracle database and ASM executable files and libraries must reside on the server’s operating system file system and cannot reside in an ASM files.


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
 


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