ORA-27090 錯誤解決執行個體

ORA-27090 錯誤解決執行個體

最近的alert日誌中碰到了ORA-27090的錯誤資訊，其錯誤提示為Unable to reserve kernel resources for asynchronous disk I/O。根據這個提示來看是跟非同步I/O相關的核心參數問題。下面是這個問題的描述與解決。 

1、故障錯誤資訊
Wed Sep 10 09:58:17 CST 2014
Errors in file /u01/app/Oracle/admin/orclls/bdump/orclls_p000_47020.trc:
ORA-27090: Unable to reserve kernel resources for asynchronous disk I/O
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Additional information: 128
Additional information: 65536
Wed Sep 10 09:58:17 CST 2014
Errors in file /u01/app/oracle/admin/orclls/bdump/orclls_p002_47024.trc:
ORA-27090: Unable to reserve kernel resources for asynchronous disk I/O
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Additional information: 128
Additional information: 65536 

2、故障分析
#調用oerr，沒有獲得比較有價值的資訊，如下：
SUSE11b:oracle:orcl102 > oerr ora 27090
27090, 00000, "Unable to reserve kernel resources for asynchronous disk I/O"
// *Cause:  The system call to reserve kernel resources for asynchronous I/O
//          has failed.
// *Action: Check errno

#進一步查看trace檔案，注，當前資料庫版本為10.2.0.5，OS為suse 11 sp3
suse11a:oracle:orcl101 > more /u01/app/oracle/admin/orclls/bdump/orclls_p002_47024.trc
/u01/app/oracle/admin/orclls/bdump/orclls_p002_47024.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options
ORACLE_HOME = /u01/app/oracle/product/10.2/db_1
System name:    Linux
Node name:      suse11a
Release:        3.0.76-0.11-default
Version:        #1 SMP Fri Jun 14 08:21:43 UTC 2013 (ccab990)
Machine:        x86_64
Instance name: orclls
Redo thread mounted by this instance: 1
Oracle process number: 35
Unix process pid: 47024, image: oracle@suse11a (P002)

*** SERVICE NAME:() 2014-09-10 09:58:17.159
*** SESSION ID:(1072.1) 2014-09-10 09:58:17.159
*** 2014-09-10 09:58:17.159
KCRP: blocks claimed = 0, eliminated = 0
----- Recovery Hash Table Statistics ---------
Hash table buckets = 32768
Longest hash chain = 0
Average hash chain = 0/0 = 0.0
Max compares per lookup = 0
Avg compares per lookup = 0/0 = 0.0
----------------------------------------------
ORA-27090: Unable to reserve kernel resources for asynchronous disk I/O
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Additional information: 128
Additional information: 65536
----- Recovery Hash Table Statistics ---------
Hash table buckets = 32768
Longest hash chain = 0
Average hash chain = 0/0 = 0.0
Max compares per lookup = 0
Avg compares per lookup = 0/0 = 0.0
----------------------------------------------
#從trace檔案中也沒有獲得比較有價值的資訊

3、故障解決
#根據ORA-27090: MESSAGE 27090 NOT FOUND; (文檔 ID 579108.1)文檔，我們修改核心參數fs.aio-max-nr
#由於此資料庫為RAC環境下，因此同時調整了2個節點，以下為調整後的情形。
suse11a:~ # grep max-nr /etc/sysctl.conf
#fs.aio-max-nr = 1048576
fs.aio-max-nr = 3145728

suse11b:~ # grep max-nr /etc/sysctl.conf
#aio-max-nr = 1048576
fs.aio-max-nr = 3145728

suse11a:~ # sysctl -p
suse11b:~ # sysctl -p

#配置完畢後可以通過cluvy校正
#幾日後觀察alert日誌，未發現該類錯誤。

Check: Kernel parameter for "aio-max-nr"
  Node Name        Current      Configured    Required      Status        Comment   
  ----------------  ------------  ------------  ------------  ------------  ------------
  suse11a          3145728      3145728      1048576      passed         
  suse11b          3145728      3145728      1048576      passed         
Result: Kernel parameter check passed for "aio-max-nr"

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