Rename Empty Diskgroup on ASM 11gR2

The goal here is to rename the DATA diskgroup to DG_PROD_DATA – here is the situation before the rename operation :

# asmcmd lsdg

State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB
Offline_disks Voting_files Name
MOUNTED NORMAL N 512 4096 1048576 32756 31828 244 15792 0 N DATA_OCR/
MOUNTED EXTERN N 512 4096 1048576 16378 10134 0 10134 0 N LOBDATA
MOUNTED EXTERN N 512 4096 1048576 24567 14267 0 14267 0 N DATA/

1) First of all, the desired diskgroup needs to be dismounted (from each node if this is a RAC configuration):

# asmcmd umount DATA

2) Verify that the desired diskgroup was dismounted:

# asmcmd lsdg

State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB
Offline_disks Voting_files Name
MOUNTED NORMAL N 512 4096 1048576 32756 31828 244 15792 0 N DATA_OCR/
MOUNTED EXTERN N 512 4096 1048576 16378 10134 0 10134 0 N LOBDATA/

3) Then execute the rename statement:

# renamedg phase=both dgname=DATA newdgname=DG_PROD_DATA verbose=true
Parsing parameters..
Parameters in effect:
Old DG name : DATA
New DG name : DG_PROD_DATA
Phases :
Phase 1
Phase 2
Discovery str : (null)
Clean : TRUE
Raw only : TRUE
renamedg operation: phase=both dgname=DATA newdgname=DG_PROD_DATA verbose=true
Executing phase 1
Discovering the group
Performing discovery with string:
Identified disk ASM:/opt/oracle/extapi/64/asm/orcl/1/libasm.so:ORCL:DATA1 with disk
number:0 and timestamp (32925601 972709888)
Identified disk ASM:/opt/oracle/extapi/64/asm/orcl/1/libasm.so:ORCL:DATA2 with disk
number:1 and timestamp (32925601 972709888)
Identified disk ASM:/opt/oracle/extapi/64/asm/orcl/1/libasm.so:ORCL:DATA3 with disk
number:2 and timestamp (32925601 972709888)
Checking for hearbeat...
Rediscovering
the group
Performing discovery with string:
Identified disk ASM:/opt/oracle/extapi/64/asm/orcl/1/libasm.so:ORCL:DATA1 with disk
number:0 and timestamp (32925601 972709888)
Identified disk ASM:/opt/oracle/extapi/64/asm/orcl/1/libasm.so:ORCL:DATA2 with disk
number:1 and timestamp (32925601 972709888)
Identified disk ASM:/opt/oracle/extapi/64/asm/orcl/1/libasm.so:ORCL:DATA3 with disk
number:2 and timestamp (32925601 972709888)
Checking if the diskgroup is mounted
Checking disk number:0
Checking disk number:1
Checking disk number:2
Checking if diskgroup is used by CSS
Generating configuration file..
Completed phase 1
Executing phase 2
Looking for ORCL:DATA1
Modifying the header
Looking for ORCL:DATA2
Modifying the header
Looking for ORCL:DATA3
Modifying the header
Completed phase 2
Terminating kgfd context 0x2af21517e0a0

4) Finally, mount the renamed diskgroup and validate that it was mounted (on each node if this is a RAC configuration):

# asmcmd mount DG_PROD_DATA

# asmcmd lsdg
State Type Rebal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB
Offline_disks Voting_files Name
MOUNTED NORMAL N 512 4096 1048576 32756 31828 244 15792 0 N DATA_OCR/
MOUNTED EXTERN N 512 4096 1048576 24567 14267 0 14267 0 N DG_PROD_DATA/
MOUNTED EXTERN N 512 4096 1048576 16378 10134 0 10134 0 N LOBDATA/

5) Delete old DISKGROUP RESOURCES

$ crsctl delete resource ora.DATA.dg

# srvctl stop diskgroup -diskgroup DATA

6) Name disks all

SQL> alter diskgroup DATA mount restricted;

Diskgroup altered.

SQL> alter diskgroup DATA rename disks all ;

SQL> alter diskgroup DATA dismount ;

Diskgroup altered.

SQL>

# srvctl start diskgroup -diskgroup DATA

IMPORTANT : With renamedg the diskgroup name changes. As the ASM File names ( like datafiles / controlfiles etc), include the diskgroups name, you need to take care ( update pfile or rename datafiles ) from the RDBMS instance, after renamedg.