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Full Discussion: Partitions.
Top Forums UNIX for Dummies Questions & Answers Partitions. Post 302503460 by Corona688 on Thursday 10th of March 2011 03:49:04 PM
Old 03-10-2011
In Windows, each drive letter is its own seperate little world. c:\ gets you files under partition 1, d:\ gets you files under partition 2, etc.

In UNIX, all files and partitions are accessed through the same directory tree. The root partition is attached first, at /, and other partitions can be optionally attached to any directories inside /, even ones inside other partitions.

On one of my systems:
Code:
$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sdc3            1008M  298M  660M  32% /
udev                   10M  340K  9.7M   4% /dev
/dev/sdc5              20G   12G  7.2G  62% /home
/dev/sdc6             9.9G  4.6G  4.9G  49% /usr
/dev/sdc7             5.6G  735M  4.6G  14% /var
/dev/sdc8             116G  5.0G  111G   5% /var/lib/mysql
shm                   948M     0  948M   0% /dev/shm
/dev/md1p8            394G  301G   74G  81% /opt
/dev/md1p9            1.4T  848G  552G  61% /opt/disk-images
/dev/sdc1              63M   28M   32M  47% /boot

So the root directory exists on the partition /dev/sdc3. If you created a file /randomname, it'd go into sdc3.

"udev" and "shm" are special filesystems handled by the kernel, you can ignore them for the moment.

Anything under /home/ goes into sdc5, so all user directories reside on that partition.

Our mysql database used to reside inside under the /var/ partition, in /var/lib/mysql, but it outgrew it. I had to give /var/lib/mysql its own partition so mysql would have more room.

And so on, and so forth.
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LEARN ABOUT MINIX

systemd-volatile-root.service

SYSTEMD-VOLATILE-ROOT.SERVICE(8)			   systemd-volatile-root.service			  SYSTEMD-VOLATILE-ROOT.SERVICE(8)

NAME

       systemd-volatile-root.service, systemd-volatile-root - Make the root file system volatile

SYNOPSIS

       systemd-volatile-root.service

       /lib/systemd/systemd-volatile-root

DESCRIPTION

       systemd-volatile-root.service is a service that replaces the root directory with a volatile memory file system ("tmpfs"), mounting the
       original (non-volatile) /usr inside it read-only. This way, vendor data from /usr is available as usual, but all configuration data in
       /etc, all state data in /var and all other resources stored directly under the root directory are reset on boot and lost at shutdown,
       enabling fully stateless systems.

       This service is only enabled if full volatile mode is selected, for example by specifying "systemd.volatile=yes" on the kernel command
       line. This service runs only in the initial RAM disk ("initrd"), before the system transitions to the host's root directory. Note that this
       service is not used if "systemd.volatile=state" is used, as in that mode the root directory is non-volatile.

SEE ALSO

       systemd(1), systemd-fstab-generator(8), kernel-command-line(7)

systemd 237													  SYSTEMD-VOLATILE-ROOT.SERVICE(8)
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