本指南详细展示了在11gR2版本中如何正确重命名ASM磁盘组的步骤。请注意，在操作过程中，应避免使用renamedg命令来重命名OCR/VOTE磁盘组，以免引起不必要的风险。

  1. 首先，需要卸载想要重命名的磁盘组（如果是RAC配置，则从每个节点上卸载）：

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    # asmcmd umount <OLD_DG_NAME>

  2. 验证所需的磁盘组是否已卸载：

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    # 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 <OLD_DG_NAME>_OCR/
    MOUNTED EXTERN N 512 4096 1048576 16378 10134 0 10134 0 N LOB<OLD_DG_NAME>/

  3. 然后执行重命名语句：

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    # renamedg phase=both dgname=<OLD_DG_NAME> newdgname=<NEW_DG_NAME> verbose=true
    Parsing parameters..
    Parameters in effect:
    Old DG name : <OLD_DG_NAME>
    New DG name : <NEW_DG_NAME>
    Phases :
    Phase 1
    Phase 2
    Discovery str : (null)
    Clean : TRUE
    Raw only : TRUE
    renamedg operation: phase=both dgname=<OLD_DG_NAME> newdgname=<NEW_DG_NAME> 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:<DISK_NAME>1 with disk number:0 and timestamp (32925601 -972709888)
    Identified disk ASM:/opt/oracle/extapi/64/asm/orcl/1/libasm.so:ORCL:<DISK_NAME>2 with disk number:1 and timestamp (32925601 -972709888)
    Identified disk ASM:/opt/oracle/extapi/64/asm/orcl/1/libasm.so:ORCL:<DISK_NAME>3 with disk number:2 and timestamp (32925601 -972709888)
    Checking for hearbeat...
    Re-discovering the group
    Performing discovery with string:
    Identified disk ASM:/opt/oracle/extapi/64/asm/orcl/1/libasm.so:ORCL:<DISK_NAME>1 with disk number:0 and timestamp (32925601 -972709888)
    Identified disk ASM:/opt/oracle/extapi/64/asm/orcl/1/libasm.so:ORCL:<DISK_NAME>2 with disk number:1 and timestamp (32925601 -972709888)
    Identified disk ASM:/opt/oracle/extapi/64/asm/orcl/1/libasm.so:ORCL:<DISK_NAME>3 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:<DISK_NAME>1
    Modifying the header
    Looking for ORCL:<DISK_NAME>2
    Modifying the header
    Looking for ORCL:<DISK_NAME>3
    Modifying the header
    Completed phase 2
    Terminating kgfd context 0x2af21517e0a0

    如果上述命令失败并搜索磁盘，那么我们需要包含磁盘字符串，然后您需要使用

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    renamedg phase=both dgname=<OLD_DG_NAME> newdgname=<NEW_DG_NAME> verbose=true asm_diskstring='<discoverystring1>','<discoverystring2>'

  4. 最后，挂载重命名的磁盘组并验证是否已挂载（如果是RAC配置，则在每个节点上进行验证）：

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    # asmcmd mount <NEW_DG_NAME>
    # 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 <OLD_DG_NAME>_OCR/

    MOUNTED EXTERN N 512 4096 1048576 24567 14267 0 14267 0 N <NEW_DG_NAME>/
    MOUNTED EXTERN N 512 4096 1048576 16378 10134 0 10134 0 N LOB<OLD_DG_NAME>/