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Oracle10g新特色-CRS(Cluster Ready Services)

发布时间:2019-10-16 11:58:37 编辑:笔名

Oracle10g CRS(Cluster Ready Services)是Oracle10g RAC的一个新特性,用以提供标准的群集服务接口。

在以前的版本中,Oracle RAC必须借助第三方Cluster软件,但是从Oracle10g开始,我们有了新的选择。

CRS就是这样一个替代产品,用以提供RAC环境中的群集服务。

CRS是一个单独的产品,在构建RAC环境中,需要单独安装。

系统启动以后,CRS会自动启动,启动主要由/etc/init.d中的几个脚本完成:

[eygle@raclinux1 init.d]$ ll init*-r-xr-xr-x 1 root root 1951 Jun 27 13:27 init.crs-r-xr-xr-x 1 root root 4735 Jun 27 20:32 init.crsd-r-xr-xr-x 1 root root 35401 Jun 27 13:27 init.cssd-r-xr-xr-x 1 root root 3197 Jun 27 13:27 init.evmd

CRS启动的三个主要的后台进程为:

[oracle@raclinux1 bin]$ ps -ef|grep d.binroot 3140 1 0 23:13 00:00:00 /u01/app/oracle/product/10.2.0/crs/bin/crsd.binoracle 3884 3062 0 23:14 00:00:00 /u01/app/oracle/product/10.2.0/crs/bin/evmd.binoracle 4017 3983 0 23:14 00:00:00 /u01/app/oracle/product/10.2.0/crs/bin/ocssd.binoracle 21117 13799 0 23:29 pts/1 00:00:00 grep d.bin

这几个进程的主要作用如下:

CRSD:- Engine for HA operation - Manages 'application resources'- Starts, stops, and fails 'application resources' over- Spawns separate 'actions' to start/stop/check application resources- Maintains configuration profiles in the OCR (Oracle Configuration Repository)- Stores current known state in the OCR.- Runs as root- Is restarted automatically on failureOCSSD:- OCSSD is part of RAC and Single Instance with ASM- Provides access to node membership- Provides group services- Provides basic cluster locking- Integrates with existing vendor clusteware, when present- Can also runs without integration to vendor clustware- Runs as Oracle.- Failure exit causes machine reboot. --- This is a feature to prevent data corruption in event of a split brain.

注意,ocssd进程在单实例ASM系统中也可以见到,以下是我的一个单实例ASM系统,ocssd进程同样存在:

bash-2.03# ps -ef|grep _+ASM oracle 3264 1 0 Aug 25 ? 0:01 asm_lgwr_+ASM root 12669 8167 0 11:58:56 pts/1 0:00 grep _+ASM oracle 3270 1 0 Aug 25 ? 0:00 asm_rbal_+ASM oracle 3266 1 0 Aug 25 ? 0:05 asm_ckpt_+ASM oracle 3268 1 0 Aug 25 ? 0:00 asm_smon_+ASM oracle 3262 1 0 Aug 25 ? 0:00 asm_dbw0_+ASM oracle 3258 1 0 Aug 25 ? 0:00 asm_pmon_+ASM oracle 3260 1 0 Aug 25 ? 0:00 asm_mman_+ASMbash-2.03# ps -ef|grep ocssd root 12672 8167 0 11:59:01 pts/1 0:00 grep ocssd oracle 5374 1 0 Apr 07 ? 0:01 /opt/oracle/product/10.1.0/bin/ocssd.binbash-2.03#

ocssd进程非常重要,如果该进程异常中止,会导致系统crash。

在某些极端情况下,如果ocssd无法正常启动,会导致操作系统循环重启。这时候需要DBA介入进行一些特殊处理。

EVMD:- Generates events when things happen- Spawns a permanent child evmlogger- Evmlogger, on demand, spawns children- Scans callout directory and invokes callouts.- Runs as Oracle.- Restarted automatically on failure

我们可以通过CRS工具来查看CRS状态:

[oracle@raclinux1 ~]$ cd $ORA_CRS_HOME/bin[oracle@raclinux1 bin]$ pwd/u01/app/oracle/product/10.2.0/crs/bin[oracle@raclinux1 bin]$ ./crs_statNAME=ora.RACDB.RACDB1.instTYPE=applicationTARGET=ONLINESTATE=ONLINE on raclinux1NAME=ora.RACDB.RACDB2.instTYPE=applicationTARGET=ONLINESTATE=ONLINE on raclinux1NAME=ora.RACDB.dbTYPE=applicationTARGET=ONLINESTATE=ONLINE on raclinux1NAME=ora.raclinux1.ASM1.asmTYPE=applicationTARGET=ONLINESTATE=ONLINE on raclinux1NAME=ora.raclinux1.LISTENER2_RACLINUX1.lsnrTYPE=applicationTARGET=ONLINESTATE=ONLINE on raclinux1NAME=ora.raclinux1.LISTENER_RACLINUX1.lsnrTYPE=applicationTARGET=ONLINESTATE=ONLINE on raclinux1NAME=ora.raclinux1.gsdTYPE=applicationTARGET=ONLINESTATE=ONLINE on raclinux1NAME=ora.raclinux1.onsTYPE=applicationTARGET=ONLINESTATE=ONLINE on raclinux1NAME=ora.raclinux1.vipTYPE=applicationTARGET=ONLINESTATE=ONLINE on raclinux1[oracle@raclinux1 bin]$

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