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  • ASM 启动报错 ORA-27300, ORA-27301 and ORA-27302: failure occurred at: sskgpsemsper 解决方法

    运维班里一学生做实验,启动ASM实例,结果报错如下:

    SQL> startup

    ORA-27154: post/wait create failed

    ORA-27300: OS system dependentoperation:semget failed with status: 28

    ORA-27301: OS failure message: No spaceleft on device

    ORA-27302: failure occurred at:sskgpsemsper

     

    OS:Redhat 5.6

    OS:11.2.0.1

     

     

    --查看磁盘信息:

    [root@lab01 ~]# df -h

    Filesystem            Size  Used Avail Use% Mounted on

    /dev/sda1              27G   11G  15G  43% /

    tmpfs                 506M     0 506M   0% /dev/shm

     

    该问题存在与11.2.0.1 之后的版本,导致的原因是因为semmns 的值太低。 该值在/etc/sysctl.conf中配置。

     

    格式如下:

    sem    = semmsl  semmns  semopm  semmni

    kernel.sem = 256     32768   100     228

     

    semaphores 参数的优化原则如下:

    1. Calculate the minimum total semaphorerequirements using the following formula:

    2*sum (process parameters of all databaseinstances on the system) + overhead for background processes + system and otherapplications.

     

    2. Set semmns (total semaphores systemwide)to this total.

     

    3. Set semmsl (semaphores for each set ) to256

     

    4. Set semmni (total semaphores sets) tosemmns devided by semmsl, rounded up to the nearest multiple of 1024

     

     

    因此该问题的解决方法就是在/etc/sysctl.conf文件中替换kernel.sem为如下值:

    kernel.sem = 256 32768 100 228

     

     

     

    --顺便查了一下我自己的测试环境,这个是Oracle preinstall设置的值:

    [oracle@dave ~]$ cat /etc/sysctl.conf|grepsem

    # oracle-rdbms-server-11gR2-preinstallsetting for kernel.sem is '250 32000 100 128'

    kernel.sem = 250 32000 100 128

     

     

    修改之后,成功启动:

    [grid@lab01 dbs]$ sqlplus / as sysasm

     

    SQL*Plus: Release 11.2.0.1.0 Production onTue Dec 3 06:53:50 2013

     

    Copyright (c) 1982, 2009, Oracle.  All rights reserved.

     

    Connected to an idle instance.

     

    SQL> startup

    ASM instance started

     

    Total System Global Area  284565504 bytes

    Fixed Size                  1336036 bytes

    Variable Size             258063644 bytes

    ASM Cache                  25165824 bytes

    ASM diskgroups mounted

    ===========================================================

     

    SQL> select * from v$version;

     

    BANNER

    --------------------------------------------------------------------------------

    Oracle Database 11g Enterprise EditionRelease 11.2.0.1.0 - Production

    PL/SQL Release 11.2.0.1.0 - Production

    CORE   11.2.0.1.0      Production

    TNS for Linux: Version 11.2.0.1.0 -Production

    NLSRTL Version 11.2.0.1.0 - Production

    ------------------------------------------------------------

    [grid@lab01 ~]$ crs_stat -t

    Name           Type           Target    State    Host       

    ------------------------------------------------------------

    ora.DATA.dg    ora....up.type ONLINE    ONLINE   lab01      

    ora.FRA.dg     ora....up.type ONLINE    ONLINE   lab01      

    ora....ER.lsnr ora....er.type ONLINE    ONLINE   lab01      

    ora.asm        ora.asm.type   ONLINE   ONLINE    lab01      

    ora.cssd       ora.cssd.type  ONLINE   ONLINE    lab01      

    ora.diskmon    ora....on.type ONLINE    ONLINE   lab01      

    ora.lab01.db   ora....se.type ONLINE    ONLINE   lab01

     

     

     

     

     

    --------------------------------------------------------------------------------------------

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  • 原文地址:https://www.cnblogs.com/tianlesoftware/p/3609053.html
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