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  Oracle Tips by Burleson

Oracle Disk I/O Tuning

Chapter 5:

Viewing Information about ASM

Ensure that the


daemon is up and running. CSSD is the daemon which controls the communication between the database instance and ASM instance. To start the CSSD daemon, follow the command:

[root@host-0002b init.d]# pwd
[root@host-0002b init.d]# ./init.cssd start
(Oracle CSSD will be run out of init)

Then start the ASM instance as follows:

become-2.05$ sqlplus "/ as sysdba"
SQL*Plus: Release - Production on Fri Apr 9 14:34:38 2004
Copyright (c) 1982, 2004, Oracle.  All rights reserved.
Connected to an idle instance.
SQL> startup nomount
ASM instance started
Total System Global Area  100663296 bytes
Fixed Size                   777616 bytes
Variable Size              99885680 bytes
Database Buffers                  0 bytes
Redo Buffers                      0 bytes
SQL> create diskgroup TEST_DG external redundancy
disk '/dev/raw/raw1' ;
Diskgroup created.
SQL> alter diskgroup TEST_DG add disk '/dev/raw/raw2';
Diskgroup altered. 

Now that we have two ASM disks with the disk group ‘


, let us try to use the resources to create a tablespace by the Database Instance ‘



The above text is an excerpt from:

Oracle Disk I/O Tuning
Disk IO Performance & Optimization for Oracle Databases



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:

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