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Old 09-12-2005, 01:16 PM   #1
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tmpfs and swap memory basics

Hi I am using Debian Sarge Distribution. When I give the command:
df -h
I get the following output:
debian:~# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/hda7             7.5G  3.6G  3.6G  50% /
tmpfs                 443M     0  443M   0% /dev/shm
Also here is my fstab
# /etc/fstab: static file system information.
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc            /proc           proc    defaults        0       0
/dev/hda7       /               ext3    defaults,errors=remount-ro 0       1
/dev/hda6       none            swap    sw              0       0
/dev/hdb        /media/cdrom0   iso9660 ro,user,noauto  0       0
I have 1 GB of Physical RAM on my system.

1)I would like to know that the 443M that it shows above(tmpfs), is that a part of RAM or hard drive space(dev/hda7) or part of my swap partition.
2)Also what are the advantages and disadvantages of having a Swap partition or not.
3)Also for what purpose in tmpfs required.

Can anyone answer the above questions or give some pointers where I can learn the basics of all these

Thank you in advance.


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