今天遭遇RAC数据库一个节点的Oracle用户无法使用ssh登录，即便使用root用户中转切换亦不可行。
[root@secodb2 ~]# su - oracle
su: cannot set user id: 资源暂时不可用

1.问题现象
1）问题节点oracle进程数
[root@secodb2 bdump]# ps -ef |grep oracle | wc -l
2089

2）其中大量充斥着如下进程
oracle     888     1 0 Oct30 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle     895     1 0 Oct23 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle     924     1 0 Nov10 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle     952     1 0 Oct26 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle     961     1 0 Nov09 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle     971     1 0 Oct26 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle     991     1 0 Oct25 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle    1031     1 0 Nov11 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle    1046     1 0 Nov06 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle    1060     1 0 Oct20 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle    1064     1 0 Oct28 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle    1074     1 0 Oct24 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle    1078     1 0 Oct20 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle    1148     1 0 Nov07 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check
oracle    1159     1 0 Nov04 ?        00:00:00 /oracle/crs/oracle/product/10.2.0/crs/bin/racgmain check

3）正常节点的oracle进程数
secodb1@secodb1 /home/oracle$ ps -ef | grep oracle | wc -l
150

2.问题分析
有关该问题的trace文件如下。
[root@secodb2 bdump]# vi secodb2_dbw0_8053.trc
/oracle/app/oracle/admin/secodb/bdump/secodb2_dbw0_8053.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, Real Application Clusters and Data Mining options
ORACLE_HOME = /oracle/app/oracle/product/10.2.0/db_1
System name:    Linux
Node name:      secodb2
Release:        2.6.18-53.el5xen
Version:        #1 SMP Wed Oct 10 16:48:44 EDT 2007
Machine:        x86_64
Instance name: secodb2
Redo thread mounted by this instance: 2
Oracle process number: 10
Unix process pid: 8053, image: oracle@secodb2 (DBW0)

*** 2010-08-31 22:06:10.227
*** SERVICE NAME:(SYS$BACKGROUND) 2010-08-31 22:06:10.221
*** SESSION ID:(877.1) 2010-08-31 22:06:10.221
WARNING:Oracle process running out of OS kernel I/O resources
*** 2010-09-01 12:33:41.918
WARNING:Oracle process running out of OS kernel I/O resources
*** 2010-09-01 17:02:49.041
WARNING:Oracle process running out of OS kernel I/O resources
*** 2010-10-09 06:02:09.697
WARNING:Oracle process running out of OS kernel I/O resources
WARNING:Oracle process running out of OS kernel I/O resources
WARNING:Oracle process running out of OS kernel I/O resources
*** 2010-10-11 17:41:09.396
WARNING:Oracle process running out of OS kernel I/O resources
WARNING:Oracle process running out of OS kernel I/O resources
WARNING:Oracle process running out of OS kernel I/O resources
*** 2010-10-15 17:41:18.121
WARNING:Oracle process running out of OS kernel I/O resources
…… 省略后面大量重复内容 ……

3.问题原因
有关该问题在MOS中“Bug 6087207 - False WARNING in alert log indicating lack of OS KERNEL I/O RESOURCES [ID 6087207.8]”有所记载，将具体的内容摘录如下，供参考。

Bug 6087207 False WARNING in alert log indicating lack of OS KERNEL I/O RESOURCES

This note gives a brief overview of bug 6087207.
The content was last updated on: 02-APR-2008
Click for details of each of the sections below.

Affects:

Product (Component) Oracle Server (Rdbms)

Range of versions believed to be affected Versions < 11

Versions confirmed as being affected

Platforms affected
Linux 32bit
Linux Itanium
Linux X86-64bit

Fixed:

This issue is fixed in

Symptoms:	Related To:
(None Specified)

Description

Note:  This fix can cause a crash in DBW and 
       has been superceeded by the fix for .
     
The Alert log can contain messages of the form.:
 WARNING:ORACLE PROCESS RUNNING OUT OF OS KERNEL I/O RESOURCES
when there is no indication of a resource issue in the OS.

Note: 
 This problem only affects platforms that preallocate resources
 to be used for asynchronous IO (eg: Linux).

Please note: The above is a summary description only. Actual symptoms can vary. Matching to any symptoms here does not confirm that you are encountering this problem. Always consult with Oracle Support for advice.

4.小结
Oracle 10g低版本中有关RAC的Bug比较多。RAC环境将以将版本升级到最新版本。

Good luck.

secooler
10.11.14

-- The End --

ITPub博客

【问题处理】Oracle process running out of OS kernel I/O resources

Bug 6087207 False WARNING in alert log indicating lack of OS KERNEL I/O RESOURCES

Affects:

Fixed:

Symptoms:

Related To:

Description

最新文章

*Product (Component)*	Oracle Server (Rdbms)
*Range of versions believed* to be affected**	Versions < 11
*Versions confirmed* as being affected**
Platforms affected	Linux 32bit Linux Itanium Linux X86-64bit