【故障处理】一次RAC故障处理过程
1.1 故障环境介绍
项目 |
source db |
db 类型 |
2节点RAC |
db version |
11.2.0.1.0 |
db 存储 |
ASM |
OS版本及kernel版本 |
RHEL 6.6 |
1.2 故障处理过程
晚上10点多,一个网友喊我帮忙处理RAC宕机不能启动的问题,并且告知涉及到多路径和存储的事。小麦苗对存储一向不太懂,多路径也没怎么接触,自己也没研究过这个东西。既然找到了我,那就不能不管啊,硬着头皮上去看看。结果悲催了,搞了N个小时,求助了N个人,搞到第二天中午,终于搞定了,幸运的是第二天是周末,不用上班。小麦苗把处理过程记录一下,希望我的处理过程可以帮到更多人。
刚开始上去看的时候,节点1的css不能启动,报了一大堆的错误,节点2的ha也不能正常启动。错误我忘记记录了,反正是各种研究日志,各种查MOS,各种百度,各种Google,包括OCR的还原都试了,最后没办法了,只有使用个人常用的绝招了,那就是。。。。。重新执行root.sh脚本。
关于该脚本的执行,我在个人博客中有多次提到。不过还是得多练练,因为注意事项很多。首先,如果要保持磁盘组不被删除,那么执行卸载命令($ORACLE_HOME/crs/install/rootcrs.pl -deconfig -force -verbose)可以加上-keepdg选项,但是11.2.0.1没有该选项。在第二个节点上执行卸载的时候可以不用加-lastnode,尽可能多的保留信息。
很幸运,小麦苗第一次执行后,集群可以正常启动了,一切安好,从10点熬到1点了吧。结果在准备导入OCR的备份的时候,需要以exec模式启动CRS,结果又悲催了,集群坏掉了。没办法,只得重启,重启更悲催,OCR的盘找不到了。小麦苗想放弃了。盘找不到,我更没办法了。只得找找懂存储的人来弄了。差不多2点了。好吧,该休息了。
早上8点多,睁眼就赶紧登teamviewer,继续处理。首先捣鼓了半天的多路径。原来第二个节点的多路径软件有问题,自己就重新安装了一下。安装后期望能看到磁盘,结果还是不行。无奈,在leshami的群里找找懂存储的高手来。肖总帮我上去看了看弄好了存储,找到了磁盘,万分感谢。
接下来就继续进行恢复操作,继续deconfig,然后root.sh。执行完root.sh后发现集群正常,自己尝试重启了一下主机,一切正常,看来就是存储搞得鬼。那就继续恢复数据库,这个是重点。由于整个操作过程都小心翼翼不敢动非OCR的盘,生怕数据搞丢了,因为10T的数据什么备份都没有,我也是醉了。用kfod看了一下磁盘,一切正常,好吧,那就接下来直接MOUNT磁盘组。重新执行root.sh后只要磁盘组的磁盘文件没有损坏,那么就可以直接MOUNT起来的。这也是在无备份情况下恢复OCR的一种办法。
接下来一切都很顺利,例如配置监听,添加DB到srvctl管理器等,真是佛祖保佑。很多处理日志并没有记录,所以这里只能给出一些脚本了。
1.2.1 处理过程中用到的一些脚本
重新执行root.sh脚本特别需要注意的是数据库的数据是否放在OCR磁盘组上。若放在OCR磁盘组上切记不能随意执行该脚本。
1、2个节点分别执行deconfig:
export ORACLE_HOME=/u01/app/11.2.0/grid export PATH=$PATH:$ORACLE_HOME/bin $ORACLE_HOME/crs/install/rootcrs.pl -deconfig -force -verbose |
2、执行完后,需要对OCR盘进行dd,2个节点都执行:
dd if=/dev/zero of=/dev/oracleasm/disks/OCR_VOL2 bs=1024k count=1024 dd if=/dev/zero of=/dev/oracleasm/disks/OCR_VOL1 bs=1024k count=1024 |
3、节点1执行完后再在节点2执行:
export ORACLE_HOME=/u01/app/11.2.0/grid $ORACLE_HOME/root.sh |
另外,对于11.2.0.1版本执行root.sh有一个常见的bug错误:
CRS-4124: Oracle High Availability Services startup Failed. CRS-4000: Command Start Failed,or completed with errors. ohasd Failed to start: Inappropriate ioctl for device ohasd Failed to start: Inappropriate ioctl for device at /u01/app/11.2.0/grid/crs/install/roothas.pl line 296. |
就是在执行root.sh之前执行以下命令
/bin/dd if=/var/tmp/.oracle/npohasd of=/dev/null bs=1024 count=1 |
如果出现
/bin/dd: opening`/var/tmp/.oracle/npohasd': No such file or directory |
的时候文件说明相关文件还没生成,那就继续执行,直到能执行为止,一般出现Adding daemon to inittab这条信息的时候执行dd命令。
1.2.2 root.sh的配置脚本
root.sh的一些配置放在如下的脚本中,包括要创建的OCR盘的名称,磁盘路径等:
$ORACLE_HOME/crs/config/config.sh |
1.2.3 kfod命令
该命令可以显示所有的磁盘信息:
data01->export ORACLE_HOME=/u01/app/11.2.0/grid data01->$ORACLE_HOME/bin/kfod disk=all s=true ds=true c=true -------------------------------------------------------------------------------- Disk Size Header Path Disk Group User Group ================================================================================ 1: 476837 Mb MEMBER /dev/oracleasm/disks/DATA_VOL1 DATA grid asmadmin 2: 953674 Mb MEMBER /dev/oracleasm/disks/DATA_VOL10 DATA grid asmadmin 3: 953674 Mb MEMBER /dev/oracleasm/disks/DATA_VOL11 DATA grid asmadmin 4: 953675 Mb MEMBER /dev/oracleasm/disks/DATA_VOL12 DATA grid asmadmin 5: 953674 Mb MEMBER /dev/oracleasm/disks/DATA_VOL13 DATA grid asmadmin 6: 953674 Mb MEMBER /dev/oracleasm/disks/DATA_VOL14 DATA grid asmadmin 7: 953674 Mb MEMBER /dev/oracleasm/disks/DATA_VOL15 DATA grid asmadmin 8: 953674 Mb MEMBER /dev/oracleasm/disks/DATA_VOL16 DATA grid asmadmin 9: 953675 Mb MEMBER /dev/oracleasm/disks/DATA_VOL18 DATA grid asmadmin 10: 953675 Mb MEMBER /dev/oracleasm/disks/DATA_VOL2 DATA grid asmadmin 11: 953674 Mb MEMBER /dev/oracleasm/disks/DATA_VOL3 DATA grid asmadmin 12: 953674 Mb MEMBER /dev/oracleasm/disks/DATA_VOL4 DATA grid asmadmin 13: 953675 Mb MEMBER /dev/oracleasm/disks/DATA_VOL5 DATA grid asmadmin 14: 953674 Mb MEMBER /dev/oracleasm/disks/DATA_VOL6 DATA grid asmadmin 15: 953674 Mb MEMBER /dev/oracleasm/disks/DATA_VOL7 DATA grid asmadmin 16: 953674 Mb MEMBER /dev/oracleasm/disks/DATA_VOL8 DATA grid asmadmin 17: 953675 Mb MEMBER /dev/oracleasm/disks/DATA_VOL9 DATA grid asmadmin 18: 476837 Mb MEMBER /dev/oracleasm/disks/FLASH_VOL1 FLASH grid asmadmin 19: 286103 Mb MEMBER /dev/oracleasm/disks/FLASH_VOL2 FLASH grid asmadmin 20: 286057 Mb MEMBER /dev/oracleasm/disks/OCR_VOL1 OCR grid asmadmin 21: 286102 Mb CANDIDATE /dev/oracleasm/disks/OCR_VOL2 # grid asmadmin 22: 476837 Mb MEMBER ORCL:DATA_VOL1 DATA <unknown> <unknown> 23: 953674 Mb MEMBER ORCL:DATA_VOL10 DATA <unknown> <unknown> 24: 953674 Mb MEMBER ORCL:DATA_VOL11 DATA <unknown> <unknown> 25: 953675 Mb MEMBER ORCL:DATA_VOL12 DATA <unknown> <unknown> 26: 953674 Mb MEMBER ORCL:DATA_VOL13 DATA <unknown> <unknown> 27: 953674 Mb MEMBER ORCL:DATA_VOL14 DATA <unknown> <unknown> 28: 953674 Mb MEMBER ORCL:DATA_VOL15 DATA <unknown> <unknown> 29: 953674 Mb MEMBER ORCL:DATA_VOL16 DATA <unknown> <unknown> 30: 953675 Mb MEMBER ORCL:DATA_VOL18 DATA <unknown> <unknown> 31: 953675 Mb MEMBER ORCL:DATA_VOL2 DATA <unknown> <unknown> 32: 953674 Mb MEMBER ORCL:DATA_VOL3 DATA <unknown> <unknown> 33: 953674 Mb MEMBER ORCL:DATA_VOL4 DATA <unknown> <unknown> 34: 953675 Mb MEMBER ORCL:DATA_VOL5 DATA <unknown> <unknown> 35: 953674 Mb MEMBER ORCL:DATA_VOL6 DATA <unknown> <unknown> 36: 953674 Mb MEMBER ORCL:DATA_VOL7 DATA <unknown> <unknown> 37: 953674 Mb MEMBER ORCL:DATA_VOL8 DATA <unknown> <unknown> 38: 953675 Mb MEMBER ORCL:DATA_VOL9 DATA <unknown> <unknown> 39: 476837 Mb MEMBER ORCL:FLASH_VOL1 FLASH <unknown> <unknown> 40: 286103 Mb MEMBER ORCL:FLASH_VOL2 FLASH <unknown> <unknown> 41: 286057 Mb MEMBER ORCL:OCR_VOL1 OCR <unknown> <unknown> 42: 286102 Mb CANDIDATE ORCL:OCR_VOL2 # <unknown> <unknown> -------------------------------------------------------------------------------- ORACLE_SID ORACLE_HOME HOST_NAME ================================================================================ +ASM1 /u01/app/11.2.0/grid data01 +ASM2 /u01/app/11.2.0/grid data02 data01-> data01-> data01-> data01->sqlplus / as sysasm sql*Plus: Release 11.2.0.1.0 Production on Sat Dec 10 12:27:25 2016 Copyright (c) 1982,2009,Oracle. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production With the Real Application Clusters and Automatic Storage Management options sql> sql> sql> alter diskgroup OCR ADD DISK '/dev/oracleasm/disks/OCR_VOL2'; Diskgroup altered. |
1.2.4 添加db到srvctl管理器中
11.2.0.1没有-c参数,那就去掉,可以用-h查看具体用法:
srvctl add database -d DGPHY -c RAC -o /oracle/app/oracle/product/11.2.0/db -p '+DATA/TESTDGPHY/PARAMETERFILE/spfiledgphy.ora' -r primary -n TESTDG srvctl add instance -d DGPHY -i DGPHY1 -n ZFZHLHRDB1 srvctl add instance -d DGPHY -i DGPHY2 -n ZFZHLHRDB2 srvctl status database -d DGPHY srvctl start database -d TESTDG |
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● 本文作者:小麦苗,只专注于数据库的技术,更注重技术的运用
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