Fixed ORA-00845: MEMORY_TARGET not supported on this system in Rac environment

Fixed ORA-00845: MEMORY_TARGET not supported on this system in Rac environment

Error:

[root@rac01 ~]# crsctl start cluster -all

CRS-2672: Attempting to start 'ora.crf' on 'rac01'

CRS-2672: Attempting to start 'ora.crf' on 'rac02'

CRS-2672: Attempting to start 'ora.asm' on 'rac02'

CRS-2672: Attempting to start 'ora.asm' on 'rac01'

CRS-2676: Start of 'ora.crf' on 'rac02' succeeded

CRS-2676: Start of 'ora.crf' on 'rac01' succeeded

CRS-5017: The resource action "ora.asm start" encountered the following error:
ORA-00845: MEMORY_TARGET not supported on this system
. For details refer to "(:CLSN00107:)" in "/u01/app/grid/diag/crs/rac02/crs/trace/ohasd_oraagent_grid.trc".
CRS-2674: Start of 'ora.asm' on 'rac02' failed
CRS-2679: Attempting to clean 'ora.asm' on 'rac02

Reason:
/dev/shm is also know as tmpfs i.e. temporary file system which keeps all the file system in virtual memory to speed up several processes.

Solution:

To increase the size
# mount -o remount,size=3G /dev/shm

Verify the size
# df -h
Filesystem   Size   Used   Avail  Use%  Mounted on
/dev/sda3   7.6G    4.4G   2.9G   61%   /
tmpfs       3G      1007M  2.1G   33%   /dev/shm
/dev/sda1   194M    25M    160M   14%   /boot

To make permanent changes to your file system update your fstab
# vi /etc/fstab
tmpfs  /dev/shm  tmpfs  defaults,size=3G  0 0

Update the new fstab file
# mount -a