File system

English Install/Boot/Login
1

Greetings

when typing the command

df -Th

it returns the following :

df -Th
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/sda2      ext4       20G   13G  5.9G  69% /
devtmpfs       devtmpfs  988M   32K  988M   1% /dev
tmpfs          tmpfs    1000M   88K 1000M   1% /dev/shm
tmpfs          tmpfs    1000M  4.1M  996M   1% /run
tmpfs          tmpfs    1000M     0 1000M   0% /sys/fs/cgroup
tmpfs          tmpfs    1000M  4.1M  996M   1% /var/run
tmpfs          tmpfs    1000M  4.1M  996M   1% /var/lock
/dev/sda3      ext4      126G  9.9G  115G   8% /home

do we assume tmpfs the swap partition which is /dev/sda1 ?? or it is something else, and if yes/no either case, why /dev/sda1 is not displayed?

thanks

jamils

2

No.
A tmpfs is a virtual filesystem in RAM, something like a “RAM-Disk”.
It contains normal files like any other filesystem, you could even create one and use it for your personal files or something like that (but beware that it gets lost when you reboot/turn off the system).
It’s mainly used for two reasons:

  • speed
  • as it is in RAM, it is cleaned automatically when you reboot. Those mounted tmpfs’s you see in your df output only contain stuff that is created on runtime, like sockets, pid files, mount points for external media and so on. No need to store that anywhere anyway, and it might even cause problems if it survives reboots.

why /dev/sda1 is not displayed?

Because /dev/sda1 is your swap partition.
swap is not “mounted”, and it contains no filesystem.

To see how much free swap and memory you have, run “free”. (“top” shows it as well in its header line)

3

On 2014-10-26 14:16, jamilsaif wrote:

> it returns the following :

Try this instead


lsblk --output NAME,KNAME,RM,SIZE,RO,TYPE,FSTYPE,LABEL,PARTLABEL,MOUNTPOINT,UUID,PARTUUID,WWN,MODEL,ALIGNMENT

–
Cheers / Saludos,

Carlos E. R.
(from 13.1 x86_64 “Bottle” at Telcontar)