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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Although the performance is important the more critical feature is to “guarantee complete dd for the disk”.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Alan<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:36.0pt"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Oleg Gelbukh [mailto:ogelbukh@mirantis.com]
<br>
<b>Sent:</b> January-16-14 5:21 AM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> Re: [openstack-dev] [ironic] Disk Eraser<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:36.0pt">On Wed, Jan 15, 2014 at 10:25 PM, Alan Kavanagh <<a href="mailto:alan.kavanagh@ericsson.com" target="_blank">alan.kavanagh@ericsson.com</a>> wrote:<o:p></o:p></p>
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<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Cheers Guys</span><o:p></o:p></p>
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<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">So what would you recommend Oleg. Yes its for linux system.</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Alan,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Approach proposed below (/dev/zero) is probably better as it allows to perform at around 60MB/s. Another approach that I've seen flying around is to generate random string and use it's hashes for dd. There are
some one-liners out there which do that with openssl, just one example:<o:p></o:p></p>
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<pre style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:7.5pt;margin-left:36.0pt;vertical-align:baseline;max-height:600px;word-wrap:normal;overflow:auto">openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt < /dev/zero > randomfile.bin<o:p></o:p></pre>
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<p class="MsoNormal" style="margin-left:36.0pt">Hope this helps.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">--<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Best regards,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:36.0pt">Oleg Gelbukh<o:p></o:p></p>
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<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">/Alan</span><o:p></o:p></p>
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<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span><o:p></o:p></p>
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<b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Oleg Gelbukh [mailto:<a href="mailto:ogelbukh@mirantis.com" target="_blank">ogelbukh@mirantis.com</a>]
<br>
<b>Sent:</b> January-15-14 10:30 AM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> Re: [openstack-dev] [ironic] Disk Eraser</span><o:p></o:p></p>
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On Wed, Jan 15, 2014 at 6:42 PM, Alexei Kornienko <<a href="mailto:alexei.kornienko@gmail.com" target="_blank">alexei.kornienko@gmail.com</a>> wrote:<o:p></o:p></p>
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If you are working on linux system following can help you:<br>
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dd if=/dev/urandom of=/dev/sda bs=4k<o:p></o:p></p>
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I would not recommend that as /dev/urandom is real slow (10-15 MB/s).<o:p></o:p></p>
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--<o:p></o:p></p>
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Best regards,<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:72.0pt">
Oleg Gelbukh<o:p></o:p></p>
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<br>
:)<br>
Best Regards,<o:p></o:p></p>
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On 01/15/2014 04:31 PM, Alan Kavanagh wrote:<o:p></o:p></p>
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Hi fellow OpenStackers<o:p></o:p></p>
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<o:p></o:p></p>
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Does anyone have any recommendations on open source tools for disk erasure/data destruction software. I have so far looked at DBAN and disk scrubber and was wondering if ironic team have some better recommendations?<o:p></o:p></p>
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<o:p></o:p></p>
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BR<o:p></o:p></p>
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Alan<o:p></o:p></p>
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<o:p></o:p></p>
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<pre style="margin-left:72.0pt">_______________________________________________<o:p></o:p></pre>
<pre style="margin-left:72.0pt">OpenStack-dev mailing list<o:p></o:p></pre>
<pre style="margin-left:72.0pt"><a href="mailto:OpenStack-dev@lists.openstack.org" target="_blank">OpenStack-dev@lists.openstack.org</a><o:p></o:p></pre>
<pre style="margin-left:72.0pt"><a href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev" target="_blank">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</a><o:p></o:p></pre>
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_______________________________________________<br>
OpenStack-dev mailing list<br>
<a href="mailto:OpenStack-dev@lists.openstack.org" target="_blank">OpenStack-dev@lists.openstack.org</a><br>
<a href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev" target="_blank">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</a><o:p></o:p></p>
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_______________________________________________<br>
OpenStack-dev mailing list<br>
<a href="mailto:OpenStack-dev@lists.openstack.org" target="_blank">OpenStack-dev@lists.openstack.org</a><br>
<a href="http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev" target="_blank">http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev</a><o:p></o:p></p>
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