oracle11gR2用gpnpprofile存放ASM的spfile路径

11gR2开始,GI集成了ASM,OCR/VOTEDISK也存放在ASM磁盘组了(11gR2以前需要存放于裸设备中),同时ASM的功能较10g也有很大增强

我们先引入一个问题：
11gR2中，OCR/VOTEDISK存放在ASM磁盘组，这也就意味着在GI能够启动的前提是能够顺利启动ASM实例并且能够将相应磁盘组MOUNT起来；而ASM的spfile却放在ASM磁盘组里，这也同样意味着要先启动ASM实例并且能读到参数文件。那如何解决这个问题呢？ 11gR2中引入了pgnp profile，用于存放ASM参数文件路径，这允许oracle在ASM实例启动以前读到参数文件。

11gR2的RAC环境中,ASM的参数文件存放于ASM磁盘组里面.ASM实例启动时候,寻找参数文件的顺序如下,直接找到为止:
1. Grid Plug and Play (GPnP) profile
2. spfile+ASM.ora
3. init+ASM.ora

请注意: 以上红色字体部分!!!

因此,11gR2中可以没有pfile,可以将ASM参数保存在gpnp profile中,在管理上省下了很多工作.

11gR2RAC环境中,ASM的参数文件支持备份(spbackup),拷贝(spcopy),移动(spmove),查询gpnp profile(spget),设置(spset)等操作
特别需要注意一点,ASM的参数文件最好放在ASM磁组里,同时确保每个集群成员的gpnp都为同一个路径

以简单例子说明，如何将ASM的spfile重新保存至ASM磁盘组

=============================================

准备环境

ASMCMD> ls -l
Type              Redund  Striped  Time             Sys  Name
ASMPARAMETERFILE  UNPROT  COARSE   DEC 14 15:00:00  Y    REGISTRY.253.866303695
                                                    N    spfileasm.ora => +OCR_VOTE/rac-cluster/ASMPARAMETERFILE/REGISTRY.253.866303695 ----注意这里是链接
ASMCMD> pwd   
+OCR_VOTE/rac-cluster/ASMPARAMETERFILE
ASMCMD> spcopy +OCR_VOTE/rac-cluster/ASMPARAMETERFILE/REGISTRY.253.866303695 +OCR_VOTE/rac-cluster/ASMPARAMETERFILE/spcopy.ora
ORA-15056: additional error message
ORA-17502: ksfdcre:4 Failed to create file +OCR_VOTE/rac-cluster/ASMPARAMETERFILE/spcopy.ora
ORA-15268: internal Oracle file +OCR_VOTE.253.1 already exists.
ORA-06512: at line 7 (DBD ERROR: OCIStmtExecute)
ASMCMD> spget
/home/grid/registry.253.839197161   --当前gpnp profile配置。该spfile是用spcopy命令生成的
ASMCMD> spmove REGISTRY.253.866303695 old_ora.bak  ---删除默认的SPFILE将导致路径缺失
ASMCMD> ls -l
ASMCMD-8002: entry 'ASMPARAMETERFILE' does not exist in directory '+OCR_VOTE/rac-cluster/'

实例环境就绪，以下是解决办法：

ASMCMD> spget
/home/grid/registry.253.839197161
ASMCMD> spcopy /home/grid/registry.253.839197161 +OCR_VOTE/rac-cluster/ASMPARAMETERFILE/registry.ora  --将本地磁盘上的spfile复制至ASM磁盘
ASMCMD> ls -l
Type              Redund  Striped  Time             Sys  Name
ASMPARAMETERFILE  UNPROT  COARSE   DEC 14 19:00:00  Y    REGISTRY.253.866316081
                                                    N    registry.ora => +OCR_VOTE/rac-cluster/ASMPARAMETERFILE/REGISTRY.253.866316081 --注意这里是链接!!!!

ASMCMD> spset +OCR_VOTE/rac-cluster/ASMPARAMETERFILE/REGISTRY.253.866316081  --更新gpnp profile至链接
ASMCMD> spget
+OCR_VOTE/rac-cluster/ASMPARAMETERFILE/REGISTRY.253.866316081

重启实例生效...

ASMCMD> shutdown --abort
ASM instance shutdown
Connected to an idle instance.
ASMCMD>
ASMCMD>
ASMCMD> startup
ASM instance started

Total System Global Area 1135747072 bytes
Fixed Size      2260728 bytes
Variable Size   1108320520 bytes
ASM Cache     25165824 bytes
ASM diskgroups mounted
ASM diskgroups volume enabled
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  EXTERN  N         512   4096  1048576      4094      926                0             926              0             N  DATA/
MOUNTED  EXTERN  N         512   4096  4194304      2032     1592                0            1592              0             Y  OCR_VOTE/
ASMCMD> spget
+OCR_VOTE/rac-cluster/ASMPARAMETERFILE/REGISTRY.253.866316081

SQL> show parameter spfile;

NAME         TYPE
------------------------------------ ----------------------
VALUE
------------------------------
spfile         string
+OCR_VOTE/rac-cluster/asmparameterfile/registry.253.866316081  --证实是通过gpnp profile里spfile启动实例

同样,其他数据库节点需要spset更新spfile路径,重启生效即可,此部分操作省略...

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