09-12-2012
@jlliagre......thanks for the help here.
My understanding is (correct me if I'm wrong) that df (what we all look at as sysadmins to see how full filesystems are) regards all disk sectors (blocks) allocated as unavailable (which they are).
One file may contain, say, 4 bytes, but occupy the minimum 512 bytes (1 block), therefore the discrepancy can be huge if there are a lot of small files. The larger the files (eg. big Oracle dB) will mean occupied blocks and actual file bytes used look closer.
The df tells you filesystem occupied blocks but du is basically adding up file sizes which will be different.
Anyone disagree with that? Useful discussion this!!
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LEARN ABOUT DEBIAN
recovermov
RECOVERMOV(1) User Commands RECOVERMOV(1)
NAME
recovermov - recover movies from a filesystem image
SYNOPSIS
recovermov [options] device
DESCRIPTION
Recovermov tries to identify mov movies from a filesystem image. To achieve this goal, it scans the filesystem image and looks for a mov
structure at blocks starting at 512 bytes boundaries.
OPTIONS
-h Display an help message.
-b blocksize
Set the size of blocks in bytes. On most file systems, setting it to 512 (the default) will work fine as any large file will be
stored on 512 bytes boundaries. Setting it to 1 maximize the chances of finding very small files if the filesystems aggregates them
(UFS for example) at the expense of a much longer running time.
-i integerindex
Set the initial index value for image numbering (default: 0).
-n basename
Basename to use to create the salvaged files. Default is video_.
All the sizes may be suffixed by a k, m or g letter to indicate KiB, MiB or GiB. For example, 6m correspond to 6 MiB (6291456
bytes).
EXAMPLES
Recover as many movies as possible from the memory card located in /dev/sdc:
recovermov /dev/sdc
Recover as many movies as possible from a crashed ReiserFS file system (which does not necessarily store files at block boundaries) in
/dev/hdb1:
recovermov -b 1 /dev/hdb1
AUTHOR
Recovermov has been written by Jan Funke <jan.funke@inf.tu-dresden.de>.
COPYRIGHT
Copyright (c) 2010 Jan Funke <jan.funke@inf.tu-dresden.de>. This is free software; see the source for copying conditions. There is NO war-
ranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
SEE ALSO
recoverjpeg(1)
recovermov January 2010 RECOVERMOV(1)