Last updated on MARCH 04, 2017
Applies to:Oracle Database - Enterprise Edition - Version 10.1.0.2 to 18.104.22.168 [Release 10.1 to 12.1]
Oracle Database - Standard Edition - Version 10.1.0.2 to 22.214.171.124 [Release 10.1 to 12.1]
Oracle Database - Enterprise Edition - Version 126.96.36.199 to 188.8.131.52 [Release 12.1]
Oracle Database - Enterprise Edition - Version 184.108.40.206 to 220.127.116.11 [Release 12.2]
Information in this document applies to any platform.
Automatic Storage Management (ASM) is an integrated file system and volume manager expressly built for Oracle database files.
This note is applicable :
1. If you wish to move to different ASM storage / Hardware.
2. If you wish to change the redundancy of the diskgroup
When the diskgroups are created with some redundancy say External,Normal or High then its redundancy cannot be changed. Need to change redundancy can arise if :
- DBA's want to switch from Normal/High Redundancy to External Redundancy due to disk space constraints or due to plans of using External methods of maintaining redundancy (like RAID 10 , etc) .
- Switch to ASM based Redundancy i.e converting from External redundancy to Normal/High Redundancy
This note discusses the steps to change the redundancy of existing diskgroups in ASM.
Also having a Full Cold Backup for the database is recommended.
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