From: Johnson, Craig E (Craig.E.Johnson@icn.siemens.com)
Date: Wed Mar 19 2003 - 10:56:33 EST
Thanks to all who responded. I realize it was a Sun question but this
usergroup seems very multi-talented. The concensus seems to be to do a dd
and overwrite the disks. Thanks to:
Brett Geer
David R. Antoch
Corne Beerse
Stan Pietkiewicz
Steve Sandau
Joseph P. Sweetser
Craig
attached mail follows:
an option of course is to dd over the things...
brett
-----Original Message-----
From: hpux-admin-owner@DutchWorks.nl
[mailto:hpux-admin-owner@DutchWorks.nl]On Behalf Of Johnson, Craig E
Sent: 18 March 2003 09:06
To: hpux-admin@DutchWorks.nl
Subject: [HPADM] Sun Disk Question
I have a Sun server with 17 disks attached to it. I want to remove all the
data and O/S from the disks before we get rid of it. Booted in single user
mode, then running format, it indicatest that it will take 71 minutes to
format each disk.
Does anyone know of a faster way of clobbering the disks short of removing
or degaussing them? Thanks!
Craig
attached mail follows:
Craig,
You can try cat 'ing /dev/null (or some other data, random pattern
or whatever..) to the RAW (character) device file of the disk....
Dave Antoch
"Johnson, Craig E" <Craig.E.Johnson
@icn.siemens.com>
Sent by: hpux-admin-owner
03/18/2003 02:05 PM
To: hpux-admin@DutchWorks.nl
cc:
Subject: [HPADM] Sun Disk Question
I have a Sun server with 17 disks attached to it. I want to remove all the
data and O/S from the disks before we get rid of it. Booted in single user
mode, then running format, it indicatest that it will take 71 minutes to
format each disk.
Does anyone know of a faster way of clobbering the disks short of removing
or degaussing them? Thanks!
Craig
attached mail follows:
Since you ask a HP group, hook them to a HP-UX box and create a HP
filesystem or such on it. It wil ruin the structure of the disk for sure.
To speed-up your process, you can try to format or erase the disks in
parallel. or just per-scsi controler parallel.
To erase the disk for sure, I'd just dump random data to the raw device. I
have no Sun at hand for device names but try to find the device for the
entire raw disk and `dd if=/dev/zero of=/dev/raw/disk bs=4K` (the blocksize
should be some reasonal value, like the cylinder size of such) The input
file can also be /dev/random or any other clearing data.
Come to think of it, is there something like /dev/zero for HP-UX? Sometimes
I just like to create a large empty file, filled with zeros (or ones or
such)
CBee
-- C. Beerse mailto:c.beerse@torex-hiscom.nl <mailto:c.beerse@torex-hiscom.nl> talkto:+31(71)5256660 -----Original Message----- From: Johnson, Craig E [mailto:Craig.E.Johnson@icn.siemens.com] Sent: dinsdag 18 maart 2003 20:06 To: hpux-admin@DutchWorks.nl Subject: [HPADM] Sun Disk Question I have a Sun server with 17 disks attached to it. I want to remove all the data and O/S from the disks before we get rid of it. Booted in single user mode, then running format, it indicatest that it will take 71 minutes to format each disk. Does anyone know of a faster way of clobbering the disks short of removing or degaussing them? Thanks! Craig
attached mail follows:
One thing you could do in your situation is to boot the machine into run
level 3, and use a GUI with multiple windows, along with multiple instances
of format. You need to be careful that you only run one LLF session per
drive. To take care of the boot disk, you would boot into single user mode
from a Solaris CD after the other drives are done, and do the one drive.
There is an option within the format utility to run multiple verify passes,
with different data patterns, after the drive completes a LLF.
One thing to keep in mind, is that there have been papers published (via the
web) describing techniques to recover data from LLF'd and over-written
disks. I seem to recall from reading them is that the probability of
recovering anything decreases dramatically with an increasing number of
write passes.
Have you gotten many "wrong list" flames?? ;-})
Stan Pietkiewicz
Stan.Pietkiewicz@statcan.ca
Informatics Technology Services Division - Statistics Canada
It may be statistically possible that my opinion is the same
as someone else's - but it is still my opinion!
-----Original Message-----
From: Johnson, Craig E [mailto:Craig.E.Johnson@icn.siemens.com]
Sent: March 18, 2003 2:06 PM
To: hpux-admin@DutchWorks.nl
Subject: [HPADM] Sun Disk Question
I have a Sun server with 17 disks attached to it. I want to remove all the
data and O/S from the disks before we get rid of it. Booted in single user
mode, then running format, it indicatest that it will take 71 minutes to
format each disk.
Does anyone know of a faster way of clobbering the disks short of removing
or degaussing them? Thanks!
Craig
attached mail follows:
You might look at sformat. I think I remeber hearing it as an answer to
a similar question recently. I have not used it much, just recently
downloaded and compiled it...
Hope this is helpful.
Steve
Johnson, Craig E wrote:
> I have a Sun server with 17 disks attached to it. I want to remove all
> the data and O/S from the disks before we get rid of it. Booted in
> single user mode, then running format, it indicatest that it will take
> 71 minutes to format each disk.
>
> Does anyone know of a faster way of clobbering the disks short of
> removing or degaussing them? Thanks!
>
> Craig
>
attached mail follows:
You could try dd'ing the disks - not exactly sure what the results would be,
but I'm pretty
sure the disks would be unreadable.
Something like: dd if=/dev/null of=/dev/rdsk/c#/t#/d#s2 bs=1024k
Not sure about the blocksize qualifier - I think it defaults to k, but I may
be wrong.
Definitely check the man page for dd on that one. But by using a larger
blocksize, I'd
imagine you could get the job done much quicker than with format. You could
even
set it something absurd like 500mb, I think. Be sure to use slice 2 to get
the whole disk.
Good luck,
joe
-----Original Message-----
From: Johnson, Craig E [mailto:Craig.E.Johnson@icn.siemens.com]
Sent: Tuesday, March 18, 2003 12:06 PM
To: hpux-admin@DutchWorks.nl
Subject: [HPADM] Sun Disk Question
I have a Sun server with 17 disks attached to it. I want to remove all the
data and O/S from the disks before we get rid of it. Booted in single user
mode, then running format, it indicatest that it will take 71 minutes to
format each disk.
Does anyone know of a faster way of clobbering the disks short of removing
or degaussing them? Thanks!
Craig
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