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Special Forums Hardware Filesystems, Disks and Memory Mount
# 8  
Old 03-25-2002
Some thoughts about new and exciting filesystems
------------------------------------------------
... the eternal optimist strikes again Smilie
------------------------------------------------
Please be careful to check the comments that follow each filesystem module!
Some filesystems are experimental, and should only be used by hackers who are working to find bugs and provide patches.
The filesystem 'translates' raw data to information, both ways:

[disk_blocks]
v ^ v
| | |
/ | | raw data
........ / .... | .| .................
/ | | semantcis
/ | |
| | |
v ^ v
[filesystemA] [filesystemB]
v ^ v
.... | ........ | .| ..................
| | | presentation
v ^ v
[files,directories]


Imagine what happens if there is a bug in the filesystem when storing your latest report!

This is how it is possible to mount a file as a filesystem, and that is a good way to test if a filesystem is 100% error free, mount a test file and check!
The only real way to protect your data is with backups.

In general the rule is:

---------------------------------------------
Do NOT backup the stuff that you WANT to lose
---------------------------------------------

If you are Ok with doing one week's work all over again from scratch, back up every week.
Otherwise, back up every time you have produced something you do not want to lose.

Atle

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Difficulty: Easy
In BASIC, GOTO jumps to a numbered or labelled line in the program.
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SWITCH_ROOT(8)						       System Administration						    SWITCH_ROOT(8)

NAME
switch_root - switch to another filesystem as the root of the mount tree SYNOPSIS
switch_root [-hV] switch_root newroot init [arg...] DESCRIPTION
switch_root moves already mounted /proc, /dev and /sys to newroot and makes newroot the new root filesystem and starts init process. WARNING: switch_root removes recursively all files and directories on the current root filesystem. OPTIONS
-h, --help show help and exit -V, --version show version number and exit RETURN VALUE
switch_root returns 0 on success and 1 on failure. NOTES
switch_root will fail to function if newroot is not the root of a mount. If you want to switch root into a directory that does not meet this requirement then you can first use a bind-mounting trick to turn any directory into a mount point: mount --bind $DIR $DIR SEE ALSO
mount(8), chroot(2), init(8), mkinitrd(8) AUTHORS
Peter Jones <pjones@redhat.com> Jeremy Katz <katzj@redhat.com> Karel Zak <kzak@redhat.com> AVAILABILITY
The switch_root command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/. util-linux June 2009 SWITCH_ROOT(8)

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