1.在配置Oracle DB 12c RAC的過程中，在Grid執行指令碼root.sh的時候，你可能會遇到如題所示的報錯
[root@rac1 ~]# /oracle/app/12.1.0.2/grid/root.sh
Performing root user operation.

The following environment variables are set as:
ORACLE_OWNER= grid
ORACLE_HOME= /oracle/app/12.1.0.2/grid

Enter the full pathname of the local bin directory: [/usr/local/bin]:
Copying dbhome to /usr/local/bin ...
Copying oraenv to /usr/local/bin ...
Copying coraenv to /usr/local/bin ...

Creating /etc/oratab file...
Entries will be added to the /etc/oratab file as needed by
Database Configuration Assistant when a database is created
Finished running generic part of root script.
Now product-specific root actions will be performed.
Using configuration parameter file: /oracle/app/12.1.0.2/grid/crs/install/crsconfig_params
2015/11/21 22:03:46 CLSRSC-4001: Installing Oracle Trace File Analyzer (TFA) Collector.

2015/11/21 22:04:12 CLSRSC-4002: Successfully installed Oracle Trace File Analyzer (TFA) Collector.

2015/11/21 22:04:13 CLSRSC-363: User ignored prerequisites during installation

OLR initialization - successful
root wallet
root wallet cert
root cert export
peer wallet
profile reader wallet
pa wallet
peer wallet keys
pa wallet keys
peer cert request
pa cert request
peer cert
pa cert
peer root cert TP
profile reader root cert TP
pa root cert TP
peer pa cert TP
pa peer cert TP
profile reader pa cert TP
profile reader peer cert TP
peer user cert
pa user cert
2015/11/21 22:05:05 CLSRSC-330: Adding Clusterware entries to file 'oracle-ohasd.conf'

CRS-4133: Oracle High Availability Services has been stopped.
CRS-4123: Oracle High Availability Services has been started.
CRS-4133: Oracle High Availability Services has been stopped.
CRS-4123: Oracle High Availability Services has been started.
CRS-2672: Attempting to start 'ora.evmd' on 'rac1'
CRS-2672: Attempting to start 'ora.mdnsd' on 'rac1'
CRS-2676: Start of 'ora.mdnsd' on 'rac1' succeeded
CRS-2676: Start of 'ora.evmd' on 'rac1' succeeded
CRS-2672: Attempting to start 'ora.gpnpd' on 'rac1'
CRS-2676: Start of 'ora.gpnpd' on 'rac1' succeeded
CRS-2672: Attempting to start 'ora.cssdmonitor' on 'rac1'
CRS-2672: Attempting to start 'ora.gipcd' on 'rac1'
CRS-2676: Start of 'ora.cssdmonitor' on 'rac1' succeeded
CRS-2676: Start of 'ora.gipcd' on 'rac1' succeeded
CRS-2672: Attempting to start 'ora.cssd' on 'rac1'
CRS-2672: Attempting to start 'ora.diskmon' on 'rac1'
CRS-2676: Start of 'ora.diskmon' on 'rac1' succeeded
CRS-2676: Start of 'ora.cssd' on 'rac1' succeeded

ASM failed to start. Check /oracle/app/grid/cfgtoollogs/asmca/asmca-151121PM100657.log for details.

2015/11/21 22:07:48 CLSRSC-184: Configuration of ASM failed

2015/11/21 22:07:49 CLSRSC-258: Failed to configure and start ASM

Died at /oracle/app/12.1.0.2/grid/crs/install/crsinstall.pm line 2017.
The command '/oracle/app/12.1.0.2/grid/perl/bin/perl -I/oracle/app/12.1.0.2/grid/perl/lib -I/oracle/app/12.1.0.2/grid/crs/install /oracle/app/12.1.0.2/grid/crs/install/rootcrs.pl ' execution failed

2.解決辦法：
擴大/dev/shm的大小：
[root@rac1 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 30G 5.2G 24G 19% /
tmpfs 1004M 204K 1004M 1% /dev/shm
/dev/sdb1 41G 14G 25G 37% /oracle
[root@rac1 ~]# umount /dev/shm
umount: /dev/shm: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
[root@rac1 ~]# fuser -km /dev/shm
/dev/shm: 5090m 5125m 5172m
[root@rac1 ~]# umount /dev/shm
[root@rac1 ~]# vi /etc/fstab
#
# /etc/fstab
# Created by anaconda on Sun Nov 8 16:01:55 2015
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=50921d9d-11bf-46f6-815e-65bf11cd734e / ext4 defaults 1 1
UUID=2e531048-7ae9-4c4a-b5b9-228e0420d958 /oracle ext4 defaults 1 2
UUID=05fc1c47-9f9f-4525-941a-7a5b54abc261 swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults,size=3G 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0

[root@rac1 ~]# mount /dev/shm
[root@rac1 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 30G 5.2G 24G 19% /
/dev/sdb1 41G 14G 25G 37% /oracle
tmpfs 3.0G 0 3.0G 0% /dev/shm

3.重新執行root.sh指令碼，成功。

CLSRSC-184 CLSRSC-258: Failed to configure and start ASM

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