[CentOS] Does devtmps and tmpfs use underlying hard disk storage or Physical Memory (RAM)
Pete Biggs
pete at biggs.org.uk
Sat Apr 20 08:23:28 UTC 2019
On Sat, 2019-04-20 at 06:21 +0530, Kaushal Shriyan wrote:
> Hi,
>
> I am running the below command on CentOS Linux release 7.6.1810 (Core)
>
> # df -hT --total
> Filesystem Type Size Used Avail Use% Mounted on
> /dev/xvda1 xfs 150G 8.0G 143G 6% /
> devtmpfs devtmpfs 7.8G 0 7.8G 0% /dev
> tmpfs tmpfs 7.8G 0 7.8G 0% /dev/shm
> tmpfs tmpfs 7.8G 817M 7.0G 11% /run
> tmpfs tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
> tmpfs tmpfs 1.6G 0 1.6G 0% /run/user/995
> tmpfs tmpfs 1.6G 0 1.6G 0% /run/user/1000
> total - 185G 8.8G 176G 5% -
> #
>
> Does devtmpfs and tmpfs use underlying hard disk storage or does it uses
> Physical Memory (RAM).
It uses RAM, that's what 'tmpfs' is, a temporary RAM filesystem.
> What is the purpose of devtmpfs which is mounted on
> /dev, tmpfs mounted on /dev/shm and so on and so forth. What is the
> difference between devtmpfs and tmpfs?
devtmpfs is a kernel maintained filesystem of automated device nodes.
tmpfs is a RAM disk.
>
> I will appreciate if anyone can help me understand the above output.
Google really is your friend here.
P.
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