由于此套Rac并非自己部门安装，是开发部安装，现交由运维部分来管理，客户需要要将asm? diskgroup name 安装部门规范来命令。遂需要将oasmdgdata1更改为datadg。
幸好Oracle的版本是11gR2，在11gR2中，Oracle有一项新特性，可以直接使用renamedg命令更改diskgroup的名称。
下面是具体的操作步骤。
grid@sundb01:/home/grid>asmcmd
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? ? 358400? 358192? ? ? ? ? ? ? ? 0? ? ? ? ? 179096? ? ? ? ? ? ? 0? ? ? ? ? ? N? OASMDGDATA01/
MOUNTED? NORMAL? N? ? ? ? 512? 4096? 1048576? ? 15360? ? 14434? ? ? ? ? ? 5120? ? ? ? ? ? 4657? ? ? ? ? ? ? 0? ? ? ? ? ? Y? OCRDG/
ASMCMD> umount oasmdgdata01
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? ? 15360? ? 14434? ? ? ? ? ? 5120? ? ? ? ? ? 4657? ? ? ? ? ? ? 0? ? ? ? ? ? Y? OCRDG/
grid@sundb01:/home/grid>renamedg -help
NOTE: No asm libraries found in the system
Parsing parameters..
phase? ? ? ? ? ? ? ? ? ? ? ? ? Phase to execute,
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (phase=ONE|TWO|BOTH), default BOTH
dgname? ? ? ? ? ? ? ? ? ? ? ? ? Diskgroup to be renamed
newdgname? ? ? ? ? ? ? ? ? ? ? New name for the diskgroup
config? ? ? ? ? ? ? ? ? ? ? ? ? intermediate config file
check? ? ? ? ? ? ? ? ? ? ? ? ? just check-do not perform actual operation,
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (check=TRUE/FALSE), default FALSE
confirm? ? ? ? ? ? ? ? ? ? ? ? confirm before committing changes to disks,
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (confirm=TRUE/FALSE), default FALSE
clean? ? ? ? ? ? ? ? ? ? ? ? ? ignore errors,
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (clean=TRUE/FALSE), default TRUE
asm_diskstring? ? ? ? ? ? ? ? ? ASM Diskstring (asm_diskstring='discoverystring',
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 'discoverystring1' ...)
verbose? ? ? ? ? ? ? ? ? ? ? ? verbose execution,
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (verbose=TRUE|FALSE), default FALSE
keep_voting_files? ? ? ? ? ? ? Voting file attribute,
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? (keep_voting_files=TRUE|FALSE), default FALSE
利用renamedg来更改diskgroup的名称：
grid@sundb01:/home/grid>renamedg phase=both dgname=oasmdgdata01 newdgname=datadg verbose=true
NOTE: No asm libraries found in the system
Parsing parameters..
Parameters in effect:
? ? ? ? Old DG name? ? ? : OASMDGDATA01
? ? ? ? New DG name? ? ? ? ? : DATADG
? ? ? ? Phases? ? ? ? ? ? ? :
? ? ? ? ? ? ? ? Phase 1
? ? ? ? ? ? ? ? Phase 2
? ? ? ? Discovery str? ? ? ? :?
? ? ? ? Clean? ? ? ? ? ? ? : TRUE
? ? ? ? Raw only? ? ? ? ? : TRUE
renamedg operation: phase=both dgname=oasmdgdata01 newdgname=datadg verbose=true
Executing phase 1
Discovering the group
Performing discovery with string:
Identified disk UFS:/dev/rhdisk2 with disk number:1 and timestamp (33002374 -296274944)
Identified disk UFS:/dev/rhdisk1 with disk number:0 and timestamp (33002374 -296274944)
Checking for hearbeat...
Re-discovering the group
Performing discovery with string:
Identified disk UFS:/dev/rhdisk2 with disk number:1 and timestamp (33002374 -296274944)
Identified disk UFS:/dev/rhdisk1 with disk number:0 and timestamp (33002374 -296274944)
Checking if the diskgroup is mounted or used by CSS
Checking disk number:1
Checking disk number:0
Generating configuration file..
Completed phase 1
Executing phase 2
Looking for /dev/rhdisk2
Modifying the header
Looking for /dev/rhdisk1
Modifying the header
Completed phase 2
Terminating kgfd context 110285ba0
grid@sundb01:/home/grid>
grid@sundb01:/home/grid>sqlplus / as sysasm
SQL*Plus: Release 11.2.0.3.0 Production on Fri Oct 10 12:33:31 2014
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Connected to:
Oracle Database 11g Enterprise Edit