10-18-2002
Raid - pick a number
Hi again people,
I certainly appreciate the comments this thread has generated. I understand most of the Raid levels. Initially I was going to go with level 5 as it provides the best security (redundancy factor). But I have to multi-boot for compatability/work reasons and then I got interested in the Penguin (to go beyond the boundaries of Gotham City). So Raid 5 went out with plan A and I scored an 80GB for Linux learning. I only considered Raid 0 as it offeres significantly faster access times, and I had trouble with the card I fitted to control the third drive - I figured my motherboard's Raid capability may as well get used. As Auswipe pointed out, though, if one drive fails (under Raid 0) they all fail. Thus, with multibooting a necessity, the best option for me seems to be to give the Penguin its own drive and get another card (one that works!).
My down load limit is well over so I'm anxiousl;y waiting on the Penguin's CD arrival for blast off. I'm looking to Mandrake as a familiarising distribution and have read a number of Penguin articles to prepare, but can anyone suggest a book/article to help me decide which distribution I should build from kernel up? I'm not interested in an XP look-a-like.
Regards to all
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SFILL(1) General Commands Manual SFILL(1)
NAME
sfill - secure free disk and inode space wiper (secure_deletion toolkit)
SYNOPSIS
sfill [-f] [-i] [-I] [-l] [-l] [-v] [-z] directory/mountpoint
DESCRIPTION
sfill is designed to delete data which lies on available diskspace on mediums in a secure manner which can not be recovered by thiefs, law
enforcement or other threats. The wipe algorythm is based on the paper "Secure Deletion of Data from Magnetic and Solid-State Memory" pre-
sented at the 6th Usenix Security Symposium by Peter Gutmann, one of the leading civilian cryptographers.
The secure data deletion process of sfill goes like this:
* 1 pass with 0xff
* 5 random passes. /dev/urandom is used for a secure RNG if available.
* 27 passes with special values defined by Peter Gutmann.
* 5 random passes. /dev/urandom is used for a secure RNG if available.
afterwards as many temporary files as possible are generated to wipe the free inode space. After no more temporary files can be created,
they are removed and sfill is finnished.
COMMANDLINE OPTIONS
-f fast (and insecure mode): no /dev/urandom, no synchronize mode.
-i wipe only free inode space, not free disk space
-I wipe only free disk space, not free inode space
-l lessens the security. Only two passes are written: one mode with 0xff and a final mode with random values.
-l -l for a second time lessons the security even more: only one random pass is written.
-v verbose mode
-z wipes the last write with zeros instead of random data
directory/mountpoint this is the location of the file created in your filesystem. It should lie on the partition you want to write.
LIMITATIONS
FILESYSTEM INTELLIGENCE
Most filesystems (ext2, ffs, etc.) have several features included to enhance performance, which will result in that sfill might not
receive all available free space. Sad but true. Nothing can be done about that ...
NFS Beware of NFS. You can't ensure you really completely wiped your data from the remote disks. (especially because of caching)
Raid Raid Systems use stripped disks and have got large caches. It's hard to wipe them.
swap Some of your data might have a copy in your swapspace. sswap is available for this task.
BUGS
No bugs. There was never a bug in the secure_deletion package (in contrast to my other tools, whew, good luck ;-) Send me any that you
find. Patches are nice too :)
AUTHOR
van Hauser / THC <vh@thc.org>
DISTRIBUTION
The newest version of the secure_deletion package can be obtained from http://www.thc.org
sfill and the secure_deletion package is (C) 1997-2003 by van Hauser / THC (vh@thc.org)
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
the Free Software Foundation; Version 2.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER-
CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
SEE ALSO
srm (1), sswap (1), sdmem (1)
SFILL(1)