<font size=2 face="sans-serif">Have you looked at the volume_clear and
volume_clear_size options in cinder.conf?</font>
<br>
<br><a href=https://github.com/openstack/cinder/blob/2013.2.rc1/etc/cinder/cinder.conf.sample#L1073><font size=3 color=blue><u>https://github.com/openstack/cinder/blob/2013.2.rc1/etc/cinder/cinder.conf.sample#L1073</u></font></a><font size=3>
</font>
<br>
<br><font size=2 face="sans-serif">The default is to zero out the volume.
 You could try 'none' to see if that helps with performance.<br>
</font>
<br><font size=2 face="sans-serif"><br>
</font>
<br><font size=1 face="Arial">Thanks,</font>
<br>
<br><font size=3 color=#8f8f8f face="Arial"><b>MATT RIEDEMANN</b></font><font size=1 face="Arial"><br>
Advisory Software Engineer<br>
Cloud Solutions and OpenStack Development</font>
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<br>
<br>
<br><font size=1 color=#5f5f5f face="sans-serif">From:      
 </font><font size=1 face="sans-serif">cosmos cosmos <cosmos0703@gmail.com></font>
<br><font size=1 color=#5f5f5f face="sans-serif">To:      
 </font><font size=1 face="sans-serif">openstack-dev@lists.openstack.org,
</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Date:      
 </font><font size=1 face="sans-serif">10/11/2013 04:26 AM</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Subject:    
   </font><font size=1 face="sans-serif">[openstack-dev]
 dd performance for wipe in cinder</font>
<br>
<hr noshade>
<br>
<br>
<br><font size=3>Hello.</font>
<br><font size=1 face="Arial">My name is Rucia for Samsung SDS.</font>
<br>
<br><font size=1 face="Arial">Now I am in trouble in cinder volume deleting.</font>
<br><font size=1 face="Arial">I am developing for supporting big data storage
in lvm </font>
<br>
<br><font size=1 face="Arial">But it takes too much time for deleting of
cinder lvm volume because of dd.</font>
<br><font size=1 face="Arial">Cinder volume is 200GB for supporting hadoop
master data.</font>
<br><font size=1 face="Arial">When i delete cinder volume in using 'dd
if=/dev/zero of $cinder-volume count=1000000 bs=1M' it takes about 30 minutes.</font>
<br>
<br><font size=1 face="Arial">Is there the better and quickly way for deleting?</font>
<br>
<br><font size=1 face="Arial">Cheers. </font>
<br><font size=1 face="Arial">Rucia.</font>
<br>
<br>
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