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Oracle Disk I/O Tuning

Chapter 5:

Viewing Information about ASM

Example of ASM configuration

To explain the ASM methodology, let us take a simple example and discuss. We take four disk devices (partitions) as shown below. We just took a single LUN of 9G for demonstration purpose and created 4 partitions. In your environment, you may have many more devices and partitions. The Command FDISK manages the disk partitions.

[root@host-0002b /]# /sbin/fdisk /dev/sdl

The number of cylinders for this disk is set to 1110.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)
 
Command (m for help): p 

Disk /dev/sdl: 255 heads, 63 sectors, 1110 cylinders
Units = cylinders of 16065 * 512 bytes
 
   Device Boot    Start       End    Blocks   Id  System

/dev/sdl1             1        13    104391   83  Linux
/dev/sdl2            14        39    208845   83  Linux
/dev/sdl3            40       549   4096575   83  Linux
/dev/sdl4           550      1059   4096575   83  Linux 


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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