crs启动失败案例分析

一次存储维修后，一套rac的1节点的集群资源起不来

crs日志

2018-07-12 21:20:40.484 [CRSD(23288)]CRS-0804: Cluster Ready Service aborted due to Oracle Cluster Registry error [PROC-26: Error while accessing the physical storage Storage layer error [Insufficient quorum to open OCR devices] [0]]. .
2018-07-12 21:20:40.531 [CRSD(23304)]CRS-8500: Oracle Clusterware CRSD process is starting with operating system process ID 23304
集群状态

[root@ybnode01 ~]# /grid/app/12.1.0/grid/bin/crsctl stat res -t -init
--------------------------------------------------------------------------------
Name           Target  State        Server                   State details       
--------------------------------------------------------------------------------
Cluster Resources
--------------------------------------------------------------------------------
ora.asm
      1        ONLINE  ONLINE       ybnode01                 Started,STABLE
ora.cluster_interconnect.haip
      1        ONLINE  ONLINE       ybnode01                 STABLE
ora.crf
      1        ONLINE  ONLINE       ybnode01                 STABLE
ora.crsd
      1        ONLINE  OFFLINE                               STABLE
ora.cssd
      1        ONLINE  ONLINE       ybnode01                 STABLE
ora.cssdmonitor
      1        ONLINE  ONLINE       ybnode01                 STABLE
ora.ctssd
      1        ONLINE  ONLINE       ybnode01                 OBSERVER,STABLE
ora.diskmon
      1        OFFLINE OFFLINE                               STABLE
ora.drivers.acfs
      1        ONLINE  ONLINE       ybnode01                 STABLE
ora.evmd
      1        ONLINE  INTERMEDIATE ybnode01                 STABLE
ora.gipcd
      1        ONLINE  ONLINE       ybnode01                 STABLE
ora.gpnpd
      1        ONLINE  ONLINE       ybnode01                 STABLE
ora.mdnsd
      1        ONLINE  ONLINE       ybnode01                 STABLE
ora.storage
      1        ONLINE  ONLINE       ybnode01                 STABLE

crs处于offline状态，crs报错说存储读取有问题
查看下asm日志

hu Jul 12 21:20:45 2018
Errors in file /grid/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_ora_23400.trc:
ORA-15081: failed to submit an I/O operation to a disk
Thu Jul 12 21:20:46 2018
NOTE: [crsd.bin@ybnode01 (TNS V1-V3) 23402] opening OCR file +DG_OCR.255.4294967295
Thu Jul 12 21:20:46 2018
Errors in file /grid/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_ora_23420.trc:
ORA-15025: could not open disk "/dev/asm/hdisk005"
ORA-27041: unable to open file
Linux-x86_64 Error: 13: Permission denied
Additional information: 3
Thu Jul 12 21:20:46 2018
Errors in file /grid/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_ora_23420.trc:
ORA-15081: failed to submit an I/O operation to a disk
Thu Jul 12 21:20:47 2018
NOTE: [crsd.bin@ybnode01 (TNS V1-V3) 23422] opening OCR file +DG_OCR.255.4294967295
Thu Jul 12 21:20:47 2018
Errors in file /grid/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_ora_23429.trc:
ORA-15025: could not open disk "/dev/asm/hdisk005"
ORA-27041: unable to open file
Linux-x86_64 Error: 13: Permission denied
Additional information: 3
Thu Jul 12 21:20:47 2018
Errors in file /grid/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_ora_23429.trc:
ORA-15081: failed to submit an I/O operation to a disk
 
failed to submit an I/O operation to a disk
Thu Jul 12 21:20:46 2018
NOTE: [crsd.bin@ybnode01 (TNS V1-V3) 23402] opening OCR file +DG_OCR.255.4294967295
Thu Jul 12 21:20:46 2018
Errors in file /grid/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_ora_23420.trc:
ORA-15025: could not open disk "/dev/asm/hdisk005"
ORA-27041: unable to open file
Linux-x86_64 Error: 13: Permission denied
Additional information: 3
Thu Jul 12 21:20:46 2018
Errors in file /grid/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_ora_23420.trc:
ORA-15081: failed to submit an I/O operation to a disk
Thu Jul 12 21:20:47 2018
NOTE: [crsd.bin@ybnode01 (TNS V1-V3) 23422] opening OCR file +DG_OCR.255.4294967295
Thu Jul 12 21:20:47 2018
Errors in file /grid/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_ora_23429.trc:
ORA-15025: could not open disk "/dev/asm/hdisk005"
ORA-27041: unable to open file
Linux-x86_64 Error: 13: Permission denied
Additional information: 3
Thu Jul 12 21:20:47 2018
Errors in file /grid/app/grid/diag/asm/+asm/+ASM1/trace/+ASM1_ora_23429.trc:
ORA-15081: failed to submit an I/O operation to a disk

asmcmd查看asm挂载情况

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   5242880  2549402                0         2549402              0             N  DG_DATA/
MOUNTED  EXTERN  N         512   4096  1048576   1048576  1048325                0         1048325              0             N  DG_FRA/
MOUNTED  NORMAL  N         512   4096  1048576     10240     9894                0            4947              1             N  DG_OCR/
MOUNTED  NORMAL  N         512   4096  8388608     30720    20664            10240            5212              0             Y  DG_VOTE/
对比过其他正常节点的状态，是一致的

查看磁盘的权限

lrwxrwxrwx 1 root root 8 Jul 12 21:55 /dev/asm/hdisk006 -> ../dm-13
lrwxrwxrwx 1 root root 7 Jul 12 21:55 /dev/asm/hdisk005 -> ../dm-6
brw-rw---- 1 grid asmadmin 253, 13 Jul 12 21:55 /dev/dm-13
brw-rw---- 1 grid asmadmin 253,  6 Jul 12 21:55 /dev/dm-6
磁盘权限grid asmadmin，与其他节点权限一致，且multipath正常

用kfed读/dev/asm/hdisk005的磁盘头，盘头信息正常。

分析到这里就比较神奇了，asm报错但是asm磁盘组挂载正常，crs又没有起来，磁盘权限和读取都是正常，为什么还会报IO的错误？

最后查看了臭名昭著的文件$ORACLE_HOME/bin/oracle，果然权限不正常，更改起权限为oracle:asmadmin 6751后即可正常启动集群。

以后遇到集群起不来的问题，$ORACLE_HOME/bin/oracle权限是必须要检查的。

[oracle@ybnode01 ~]$ ls -lrt $ORACLE_HOME/bin/oracle
-rwsr-s--x 1 oracle asmadmin 324277793 Jun 14 04:56 /oracle/app/oracle/12.1.0/bin/oracle
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原文链接：https://blog.youkuaiyun.com/qq_40687433/article/details/81072724