Date: Mon, 19 Feb 2007 14:51:43 -0500 From: Kris Kennaway <kris@obsecurity.org> To: Volker <volker@vwsoft.com> Cc: freebsd-stable@freebsd.org Subject: Re: getting garbage faster using FreeBSD? Message-ID: <20070219195143.GA42379@xor.obsecurity.org> In-Reply-To: <45D9FD35.6040702@vwsoft.com> References: <45D9FD35.6040702@vwsoft.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Mon, Feb 19, 2007 at 08:40:37PM +0100, Volker wrote: > Hi! > > For my dentist I'm currently in the process of destroying some tape > cartridges (SLR7) and also two hard disks (147G SCSI). > > As I started for the tapes, I've used dd to fill the tape with > random garbage. Just a simple `dd if=/dev/random of=/dev/nsa0'. > > The tape sits there since 48 hours writing a block of data every > other minute and still didn't fill up the tape completely. The > system this is running on is a P-4 3GHz machine using FreeSBIE 2.0 > (6.2-RELEASE based). > > I suspect this to be a slow /dev/random. This sounds odd to me, I get 18-20MB/sec sustained read performance from /dev/random on this 2GHz system, which is probably faster than your tape write speed. > Is there any chance to speed up /dev/random? Would a hifn > accelerator card help here to get FreeBSD produce garbage faster? > > As there is medical data on all media I really need garbage > (/dev/zero wouldn't be enough for data security as this might get > recovered). Neither would a single pass with /dev/random, but you presumably knew this. Kris
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20070219195143.GA42379>