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тАО11-04-2010 02:53 AM
тАО11-04-2010 02:53 AM
I have a few old HP-UX boxes with loads of data which I like to sanitize.
My question is: What can I do best:
umount the mountpoints, lvreduce -m0 ..., lvrmeove, vgremove and then sanitze with dd or can I umount, vgexport the VG and sanitize with dd.
Greets,
Renarios
Solved! Go to Solution.
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тАО11-04-2010 03:00 AM
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тАО11-04-2010 04:45 AM
тАО11-04-2010 04:45 AM
Re: Destroy data
its depend if you like the disk use again,
if not you could use also physical damage on the disks.
PS : i think if you use pvcreate -f on your disk it could be enough.
mikap
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тАО11-04-2010 08:03 AM
тАО11-04-2010 08:03 AM
Re: Destroy data
Realize that you can still retrieve information from a disk after just about anything you can do to it - short of meling it down.
If you have legal requirements to ensure the data is irretrievable, you're pretty much stuck with finding someone to give it an acid bath or melt it down. Other than that, a few dd runs with alternating 0s and 1s should do the trick.
Doug
------
Senior UNIX Admin
O'Leary Computers Inc
linkedin: http://www.linkedin.com/dkoleary
Resume: http://www.olearycomputers.com/resume.html
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тАО11-04-2010 12:46 PM
тАО11-04-2010 12:46 PM
Re: Destroy data
I already created that a loop that alternately does a dd if=/dev/null and /dev/zero for a couple of times, so I hope that does the trick.
Cheers,
Renarios
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тАО11-04-2010 01:40 PM
тАО11-04-2010 01:40 PM
Re: Destroy data
> I already created that a loop that alternately does a dd if=/dev/null and /dev/zero for a couple of times,
Using '/dev/null' will do nothing. You can most certainly use '/dev/zero' or for random patterns (slower) use '/dev/urandom':
# dd if=/dev/urandom of=dev/rdsk/CxtYdZ bs=1024k
Note the use of the raw disk device to circumvent the LVM layer and buffer cache. Note, too, the use of a large blocksize for fast I/O.
As Doug noted, "sanitization" really is a relative term, but for general purposes, a few passes with 'dd' is probably reasonable.
Regards!
...JRF...
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тАО11-05-2010 05:20 AM
тАО11-05-2010 05:20 AM
Re: Destroy data
Thanks for the input. RandomNumGen wasn't installed on the boxes yet. I installed it, so let's test it!
Cheers,
Renarios
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тАО11-05-2010 05:21 AM
тАО11-05-2010 05:21 AM
Re: Destroy data
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тАО12-10-2010 11:17 AM
тАО12-10-2010 11:17 AM
Re: Destroy data
http://www.allegro.com/?page_id=419
(We support other multi-pass erasure standards, but find that most people seem to be interested in either HIPAA or single-pass erasure.)
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тАО12-10-2010 11:33 AM
тАО12-10-2010 11:33 AM
Re: Destroy data
Thanks for your reply, but I've already done the trick. Disks are clean after being rewritten with /dev/urandom information for forty times.
It would be a good alternative for the next time though!
Cheers,
Renarios