How To Create manually an ASM Instance From Scratch

This note will explain how to create an ASM instance from scratch instead of using DBCA.

步骤如下：

Before you start, its recommended that ASM instance installed in a separate Oracle home, it is very useful in the case of applying patches and upgrade. For example you can upgrade ASM home from 10.2.0.3 to 10.2.0.4 while database home still on 10.2.0.3.

1) Because CSS must be running before any ASM instance, you have to make sure that CSS service is running:

# crsctlcheckcss
ClusterSynchronizationServicesappearshealthy

If its not running, you should configure CSS process by running $ORACLE_HOME/bin/localconfig script:

#$ORACLE_HOME/bin/localconfigall

/etc/oracledoesnotexist.Creatingitnow.
SuccessfullyaccumulatednecessaryOCRkeys.
CreatingOCRkeysforuser'root',privgrp'root'..
Operationsuccessful.
ConfigurationforlocalCSShasbeeninitialized

Addingtoinittab
Startupwillbequeuedtoinitwithin90seconds.
CheckingthestatusofnewOracleinitprocess...
ExpectingtheCRSdaemonstobeupwithin600seconds.

CSSisactiveonthesenodes.
DEV1
CSSisactiveonallnodes.
OracleCSSserviceisinstalledandrunningunderinit(1M)

2) Create the init+ASM.ora file in $ORACLE_HOME/dbs (this ORACLE_HOME being the newly created one).

(Change any of these parameters if needed for your environment)

# Default asm_diskstring values for supported platforms:
# Solaris (32/64 bit) /dev/rdsk/*
# Windows NT/XP //./orcldisk*
# Linux (32/64 bit) /dev/raw/*
# HPUX /dev/rdsk/*
# HPUX(Tru 64) /dev/rdisk/*
# AIX /dev/rhdisk/*

ASM_DISKSTRING=''
INSTANCE_TYPE='ASM'
LARGE_POOL_SIZE=40M
REMOTE_LOGIN_PASSWORDFILE='EXCLUSIVE'
USER_DUMP_DEST=$ORACLE_HOME/admin/+ASM/udump
BACKGROUND_DUMP_DEST=$ORACLE_HOME/admin/+ASM/bdump
CORE_DUMP_DEST=$ORACLE_HOME/admin/+ASM/cdump

3) Creating ADMIN directories:

$cd$ORACLE_HOME
$mkdirdbs
$mkdiradmin
$cdadmin
$mkdir+ASM
$cd+ASM
$mkdirudump
$mkdirbdump
$mkdircdump

4) Starting the ASM Instance

For UNIX platforms:

#su-oracle
$ORACLE_SID=+ASM;exportORACLE_SID
$sqlplus"/assysdba"
SQL>startup

For Microsoft Windows platforms:

C:/>oradim-new-asmsid+ASM-syspwdchange_on_install
-pfileD:/oracle/product/10.2.0/admin/+ASM/pfile/init.ora-spfile
-startmodemanual-shutmodeimmediate

Instancecreated.

C:/>oradim-edit-asmsid+ASM-startmodea
C:/>setoracle_sid=+ASM
C:/>sqlplus"/assysdba"

SQL>startuppfile='C:/oracle/product/10.1.0/admin/+ASM/pfile/init.ora';

5) Create SPFILE from PFILE:

SQL>createspfile='+ASM'frompfile;

6) For Unix platform, put an entry in the oratab file for the ASM intance:

+ASM:<ASMOracleHome>:Y

You may get the following error on first start:

ORA-15110: no diskgroups mounted

This error can be safely ignored, when creating a new diskgroup, the diskgroup name will be added automatically to the asm_diskgroups parameter and you will not get this error again.

From Oracle

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