The size of in-memory file system mounted at /dev/shm is “259072” megabytes which does not match the size in /etc/fstab as “0” megabytes

“runcluvfy.sh” pre-check running  shows WARNING about /dev/shm,  but “cluvfy” does not complain.

$ runcluvfy.sh stage  -pre crsinst -n racnode1,racnode2 -verbose
....
...
..
Daemon not running check passed for process "avahi-daemon"

Starting check for /dev/shm mounted as temporary file system ...

WARNING:

The size of in-memory file system mounted at /dev/shm is "259072" megabytes which does not match the size in /etc/fstab as "0" megabytes
The size of in-memory file system mounted at /dev/shm is "259072" megabytes which does not match the size in /etc/fstab as "0" megabytes

Check for /dev/shm mounted as temporary file system passed
....
...
..
.
Pre-check for cluster services setup was unsuccessful on all the nodes.

$cluvfy stage  -pre crsinst -n racnode1,racnode2 -verbose
....
...
..
.
Daemon not running check passed for process "avahi-daemon"
Starting check for /dev/shm mounted as temporary file system ...
Check for /dev/shm mounted as temporary file system passed
Starting check for /boot mount ...
Check for /boot mount passed
Starting check for zeroconf check ...
Check for zeroconf check passed
Pre-check for cluster services setup was successful on all the nodes.

According to Doc (ID 1918620.1) , this WARNING can be ignored.

The size of in-memory file system mounted at /dev/shm is “24576” megabytes which does not match the size in /etc/fstab as “0” megabytes (Doc ID 1918620.1)

APPLIES TO: Oracle Database – Enterprise Edition – Version 12.1.0.2 to 12.1.0.2 [Release 12.1] Oracle Database – Enterprise Edition – Version 11.2.0.3 to 11.2.0.3 [Release 11.2] Information in this document applies to any platform. SYMPTOMS 12.1.0.2 OUI/CVU (cluvfy or runcluvfy.sh) reports the following warning: WARNING: The size of in-memory file system mounted at /dev/shm is “24576” megabytes which does not match the size in /etc/fstab as “0” megabytes   OR   PRVE-0426 : The size of in-memory file system mounted as /dev/shm is “74158080k” megabytes which is less than the required size of “2048” megabytes on node “”   /dev/shm setting is default so no size specified is in /etc/fstab: $ grep shm /etc/fstab tmpfs /dev/shm tmpfs defaults 0 0   /dev/shm has OS default setting: $ df -m | grep shm tmpfs 7975 646 7330 9% /dev/shm   CAUSE Due to unpublished bug 19031737 SOLUTION Since the size of /dev/shm is bigger than 2GB, the warning can be ignored.