Oracle10g新特色:CRS(Cluster Ready Services)

最新推荐文章于 2024-10-01 19:31:07 发布

转载最新推荐文章于 2024-10-01 19:31:07 发布 · 208 阅读

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本文介绍了Oracle10g中的Cluster Ready Services (CRS)，这是一个用于提供标准群集服务接口的新特性。CRS作为独立产品，可在构建RAC环境中单独安装，并在系统启动时自动运行。文章还详细解释了CRS的三个核心后台进程CRSD、OCSSD和EVMD的功能。

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.bin

root      3140     1  0 23:13         00:00:00 /u01/app/oracle/product/10.2.0/crs/bin/crsd.bin

oracle    3884  3062  0 23:14         00:00:00 /u01/app/oracle/product/10.2.0/crs/bin/evmd.bin

oracle    4017  3983  0 23:14         00:00:00 /u01/app/oracle/product/10.2.0/crs/bin/ocssd.bin

oracle   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 failure



OCSSD:

- 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_ ASM

bash-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.bin

bash-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_stat

NAME=ora.RACDB.RACDB1.inst

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.RACDB.RACDB2.inst

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.RACDB.db

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.raclinux1.ASM1.asm

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.raclinux1.LISTENER2_RACLINUX1.lsnr

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.raclinux1.LISTENER_RACLINUX1.lsnr

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.raclinux1.gsd

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.raclinux1.ons

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.raclinux1.vip

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



[oracle@raclinux1 bin]$

查看本文来源

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.bin

root      3140     1  0 23:13         00:00:00 /u01/app/oracle/product/10.2.0/crs/bin/crsd.bin

oracle    3884  3062  0 23:14         00:00:00 /u01/app/oracle/product/10.2.0/crs/bin/evmd.bin

oracle    4017  3983  0 23:14         00:00:00 /u01/app/oracle/product/10.2.0/crs/bin/ocssd.bin

oracle   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 failure



OCSSD:

- 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_ ASM

bash-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.bin

bash-2.03#

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_stat

NAME=ora.RACDB.RACDB1.inst

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.RACDB.RACDB2.inst

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.RACDB.db

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.raclinux1.ASM1.asm

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.raclinux1.LISTENER2_RACLINUX1.lsnr

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.raclinux1.LISTENER_RACLINUX1.lsnr

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.raclinux1.gsd

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.raclinux1.ons

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



NAME=ora.raclinux1.vip

TYPE=application

TARGET=ONLINE

STATE=ONLINE on raclinux1



[oracle@raclinux1 bin]$

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