[rescue] Block size and the single DD - more test results
caleb at webninja.com
Thu Feb 12 16:10:27 CST 2004
On 2004-02-12 16:44:01 -0500 Sheldon T. Hall <shel at cmhcsys.com> wrote:
> However, if dd reads the whole slice, it would seem to be a poor
> choice of
> backups of small filesystems on big disks/slices ... yet many folks
> use it.
> Anyone want to tell me what's going on here?
As far as I know, the true meaning of 'dd' has been lost to the mists
of time, but it likely stood for something along the lines of 'disk
duplicator' or 'data dumper' or something along those lines. It has
no real concept of a file, or even a filesystem. dd basically does a
byte-for-byte copy of a device/slice/partition, it has no concept of
what is actually on the filesystem. This is a feature. It allowed me
to use dd to make clones of systems that the underlying OS knows
nothing about (ie, using linux to make clones of a Windows 2000
installation for corporate roll-out, or making _bootable_ backups of
my IRIX install CDs from linux).
It is NOT a backup utility in the normal sense of backup<->recovery,
but it rocks for system imaging.
What dd+tape gives you (assuming your hardware/OS support it) is the
ability to make bootable tapes, which is pretty damn cool for bare
For backup/restore of files you need something that understands what
files are, ie. [sg]tar/zip/cpio/etc
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