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From: | James Youngman |
Subject: | Re: Default number of overwrites in shred |
Date: | Thu, 3 May 2007 23:54:56 +0100 |
On 5/3/07, Peter Eckersley <address@hidden> wrote:
We're certainly working on making sure that userspace chattr()s the attribute. Apparently, for many journalling filesystems (ext3 and maybe Reiser, IIRC), shred should still work pretty well as-is -- I guess that's because the filesystem promises metadata consistency, not data consistency. For the others, we can certainly ping the developers about it. We could potentially work on patches too, but that's less likely unless there's an obvious case where the patch would make a lot of real-world difference.
There is a very interesting presentation by Wietse Venema which discusses this in detail (and, sadly, demonstrates that it is much harder to do this reliably that one might think). I can't find a link to the talk but there is an HTML version of it in the Google Cache at http://66.102.9.104/search?q=cache:fNI_tJkUHzIJ:www.hack.lu/images/8/80/Venema.ppt+Venema.ppt&hl=en&ct=clnk&cd=3 I think his comments about this relate mainly to ZFS and ext3, though. James.
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