Please look at the below details of a RHEL 5.3 server. I wish to know about this 'tmpfs' filesystem. Why do a Linux server have this filesystem and it mounted on /dev/shm? When I checked in /dev/shm, nothing is there? Please explain in detail. Thanks.
[root@pmclsb01 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
51G 7.8G 40G 17% /
/dev/xvda1 99M 19M 75M 21% /boot
tmpfs 3.1G 0 3.1G 0% /dev/shm <------ ?
[root@pmclsb01 ~]# free -m
total used free shared buffers cached
Mem: 6144 4561 1582 0 179 4174
-/+ buffers/cache: 207 5936
Swap: 8159 0 8159
[root@pmclsb01 ~]# cd /dev/shm
[root@pmclsb01 shm]# ls
[root@pmclsb01 shm]# du -sh .
[root@pmclsb01 shm]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.3 (Tikanga)
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