grid 版本：11.2.0.4.0

GPnP profile

Gpnp profile文件是一个xml文件,它存储的位置是在$GRID_HOME/gpnp/profile/peer/profile.xml当集群启动的时候,Cluster Synchronization Services (CSS)将扫描所有的ASM disks,它利用的是GPnP profile文件中的ASM discovery string.如下所示:
    
     gpnptool工具可以查看gpmp pfofile 内容：[grid@prod01 ~]$ gpnptool get -o-
    
    
     
      
       
       
      
     
     
     
     
      
       
       
       
        
         
          
          
         
        
        
        
         omBcXU12u7D2rNJWiLbiRlEenpU=
        
       
      
      
       GdjloSdmpnW0iuhLVAmR9bhQknVPxAvVuVpOVaQR3ZZO35ff164e9QYlXtQgfL2/63fA/YwpeQhi8uwMtqEjddFaFw8wCxm8RyMOa+6WcCMMBceIycgTNaMMnw93hGcmrYYClh3lt+2ACV3gkcjB3VTB82WfZEvvvcTZ1OTukVk=
      
     
    Success.

定位votedisk

CSSD scans the headers of all ASM disks ( as indicated in ASM_DISKSTRING in GPnP profile) to identify the disk containing the voting file. Using the pointers in ASM disk headers, the Voting Files locations on ASM Disks are accessed by CSSD and CSSD is able to complete initialization and start or join an existing cluster.

css通过gpnp profile 文件的DiscoveryString确定votedisk 发现路径，然后扫描该路径下的磁盘的磁盘头信息。

kfdhdb.vfstart 是votedisk开始AU的偏移量，kfdhdb.vfend是votedisk结束AU偏移量。通过这2个值确定vd文件的位置

[grid@prod01 dev]$ kfed read /dev/asm-diskb |grep -E 'vf|au'kfdhdb.ausize:                  1048576 ; 0x0bc: 0x00100000kfdhdb.vfstart:                     256 ; 0x0ec: 0x00000100kfdhdb.vfend:                       288 ; 0x0f0: 0x00000120[grid@prod01 dev]$ kfed read /dev/asm-diskc |grep -E 'vf|au'kfdhdb.ausize:                  1048576 ; 0x0bc: 0x00100000kfdhdb.vfstart:                     256 ; 0x0ec: 0x00000100kfdhdb.vfend:                       288 ; 0x0f0: 0x00000120[grid@prod01 dev]$ kfed read /dev/asm-diskd |grep -E 'vf|au'kfdhdb.ausize:                  1048576 ; 0x0bc: 0x00100000kfdhdb.vfstart:                     256 ; 0x0ec: 0x00000100kfdhdb.vfend:                       288 ; 0x0f0: 0x00000120[grid@prod01 dev]$ kfed read /dev/asm-test01 |grep -E 'vf|au'kfdhdb.ausize:                  1048576 ; 0x0bc: 0x00100000kfdhdb.vfstart:                       0 ; 0x0ec: 0x00000000kfdhdb.vfend:                         0 ; 0x0f0: 0x00000000[grid@prod01 dev]$ kfed read /dev/asm-test02 |grep -E 'vf|au'kfdhdb.ausize:                  1048576 ; 0x0bc: 0x00100000kfdhdb.vfstart:                       0 ; 0x0ec: 0x00000000kfdhdb.vfend:                         0 ; 0x0f0: 0x00000000

定位asm spfile

通过kfdhdb.spfile,kfdhdb.spfflg标志确定asm spfile 位置，启动asm实例。

kfdhdb.spfile:Allocation unit number of the ASM spfile. Version 11.2 and later only.kfdhdb.spfflg:ASM spfile flag. If this is 1, the ASM spfile is on this disk in allocation unit kfdhdb.spfile. Version 11.2 and later only.

[grid@prod01 dev]$ kfed read /dev/asm-diskb |grep -E 'spf|au'kfdhdb.ausize:                  1048576 ; 0x0bc: 0x00100000kfdhdb.spfile:                       59 ; 0x0f4: 0x0000003bkfdhdb.spfflg:                        1 ; 0x0f8: 0x00000001[grid@prod01 dev]$ kfed read /dev/asm-diskc |grep -E 'spf|au'kfdhdb.ausize:                  1048576 ; 0x0bc: 0x00100000kfdhdb.spfile:                        0 ; 0x0f4: 0x00000000kfdhdb.spfflg:                        0 ; 0x0f8: 0x00000000[grid@prod01 dev]$ kfed read /dev/asm-diskd |grep -E 'spf|au'kfdhdb.ausize:                  1048576 ; 0x0bc: 0x00100000kfdhdb.spfile:                       59 ; 0x0f4: 0x0000003bkfdhdb.spfflg:                        1 ; 0x0f8: 0x00000001[grid@prod01 dev]$ asmcmdlASMCMD> sdgState    Type    Rebal  Sector  Block       AU  Total_MB  Free_MB  Req_mir_free_MB  Usable_file_MB  Offline_disks  Voting_files  NameMOUNTED  NORMAL  N         512   4096  1048576     15360    14434             5120            4657              0             Y  DATA/MOUNTED  EXTERN  N         512   4096  1048576      6144     6047                0            6047              0             N  DG1/ASMCMD> exit[grid@prod01 dev]$ asmcmd spget+DATA/prod-cluster/asmparameterfile/registry.253.990525365When an Oracle ASM instance searches for an initialization parameter file, the search order is:The location of the initialization parameter file specified in the Grid Plug and Play (GPnP) profileIf the location has not been set in the GPnP profile, then the search order changes to:SPFILE in the Oracle ASM instance homeFor example, the SPFILE for Oracle ASM has the following default path in the Oracle Grid Infrastructure home in a Linux environment:$ORACLE_HOME/dbs/spfile+ASM.oraPFILE in the Oracle ASM instance home