执行root.sh时提示ORA-15031错误解决
近日处理一个Oracle Grid infrastructure(GI)安装的问题，在执行root.sh过程中失败，并显示下面错误：错误ORA-15031的提示，还是
近日处理一个Oracle Grid infrastructure(GI)安装的问题，在执行root.sh过程中失败，并显示下面错误：
Disk Group OCR creation failed with the following message:
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification '/dev/vx/rdsk/dg_db01/lv_vote1' matches no disks ORA-15031: disk specification '/dev/vx/rdsk/dg_db01/lv_vote2' matches no disks
ORA-15031: disk specification '/dev/vx/rdsk/dg_db01/lv_vote3' matches no disks
Configuration of ASM ... failed
see asmca logs at /oracle/base/cfgtoollogs/asmca for details
Did not succssfully configure and start ASM at /oracle/product/11.2.0.4/grid_1/crs/install/crsconfig_lib.pm line 6468.
/oracle/product/11.2.0.4/grid_1/perl/bin/perl -I/oracle/product/11.2.0.4/grid_1/perl/lib -I/oracle/product/11.2.0.4/grid_1/crs/install /oracle/product/11.2.0.4/grid_1/crs/install/rootcrs.pl execution failed
错误ORA-15031的提示，还是很明显的，无法识别对应的voting磁盘，正常解决思路，就是检查磁盘是否正常挂载，权限是否正确等，需要逐项检查。在Metalink上搜索，这个错误一般都是在node2上执行root.sh会遇到，而node1都是正常的。大多是权限以及系统层面挂载出现问题。但是我这个问题，是在node1上执行root.sh就失败了。
开始各项分析检查：
1. 检查磁盘是否存在，权限是否正确，All Pass
#ls -lrt /dev/vx/rdsk/dg_db01
crw-rw---- 1 grid asmadmin 40,60000 Feb 12 10:51 lv_vote1
crw-rw---- 1 grid asmadmin 40,60001 Feb 12 10:52 lv_vote2
crw-rw---- 1 grid asmadmin 40,60002 Feb 12 10:52 lv_vote3
2. 检查asm_diskstring设置
SQL> show parameter asm_diskstring
NAME TYPE VALUE
------------------------------------ --------------------------------- ------------------------------
asm_diskstring string /dev/vx/rdsk/dg_db01
3. 并使用kfod来查看，是否能扫描到对应的磁盘，也正常
kfod asm_diskstring='/dev/vx/rdsk/dg_db01/lv_*' disks=all
--------------------------------------------------------------------------------
Disk Size Path User Group
================================================================================
1: 327680 Mb /dev/vx/rdsk/dg_db01/lv_data01 grid asmadmin
2: 327680 Mb /dev/vx/rdsk/dg_db01/lv_data02 grid asmadmin
3: 327680 Mb /dev/vx/rdsk/dg_db01/lv_data03 grid asmadmin
4: 112910 Mb /dev/vx/rdsk/dg_db01/lv_data04 grid asmadmin
5: 1024 Mb /dev/vx/rdsk/dg_db01/lv_vote1 grid asmadmin
6: 1024 Mb /dev/vx/rdsk/dg_db01/lv_vote2 grid asmadmin
7: 1024 Mb /dev/vx/rdsk/dg_db01/lv_vote3 grid asmadmin
--------------------------------------------------------------------------------
ORACLE_SID ORACLE_HOME
================================================================================
+ASM1 /oracle/product/11.2.0.4/grid_1
grid@HAZZ-NRMS-RESDB01:/home/grid>
4. 至此，我怀疑是asm_diskstring设置的不够准确，将其更改为
SQL> show parameter asm_diskstring
NAME TYPE VALUE
------------------------------------ --------------------------------- ------------------------------
asm_diskstring string /dev/vx/rdsk/dg_db01/lv_*
但是问题依旧没有解决，
5. 检查集群安装环境，也没有发现问题
$ ./runcluvfy.sh stage -pre crsinst -n node1,node2 -verbose
$ ./runcluvfy.sh comp ssa -n all -verbose
6. 操作系统日志，没有发现错误
IBM: /bin/errpt -a > messages.out
至此，可以确认，根据oracle的安装文档，目前的磁盘权限完全符合安装条件，在GI的图形化安装过程，也是可以看见ASM disk的，但是在root.sh执行过程中，就是无法通过。
后通过Metalink查询到下面文章
ASM Is Not Detecting Raw Devices Or Regular Raw Devices On AIX (Doc ID 1174604.1)
根据文档描述：
EMC存储，使用多路径，可能会遇到这个问题，而我的存储确实使用的EMC和多路径。
好吧，按照这个文档的Solution，测试一下
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