Lab 11.1 - my /dev/shm is not tmpfs [SOLVED - it`s normal]

dbuday

In Lab pdf stays:

$ df -h /dev/shm

Filesystem

tmpfs

Type

tmpfs

Size

3.9G

Used Avail Use% Mounted on

24M 3.9G

1% /dev/shm

My output is:

df -h /dev/shm

Filesystem Size Used Avail Use% Mounted on

none 724M 212K 723M 1% /run/shm

My output shows Filesystem: none and Monted on /run/shm

Is it normal?

dbuday

Further:

df -h | grep tmpfs
tmpfs 145M 1,2M 144M 1% /run

My only tmpfs is /run

coop

This is normal. Exactly what is on tmpfs filesystems depends on your distribution; you did not mention what that is. For example on my (RHEL 7) system:

$ df -h | grep tmpfs
devtmpfs devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs tmpfs 7.8G 152M 7.7G 2% /dev/shm
tmpfs tmpfs 7.8G 9.1M 7.8G 1% /run
tmpfs tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
tmpfs tmpfs 1.6G 40K 1.6G 1% /run/user/1000

You can have multiple tmpfs ramdisks mounted in fact as shown above.

I've yet to see a distribution that doesn't use /dev/shm, but it's not essential to have it. Also note they are really not 7.8 GB in size here (which is half of my RAM). they are allowed to grow to that big but the size is dynamical.

dbuday

Thank you mister Cooperstein for clearing this up for me; where will we be without your help.

P.S. Distribution is Ubuntu 14.04