<div dir="ltr">Depends on your needs... if your only need is to save space then your right use qcow2 but if you have any need for stability or robustness use raw (qcow2 for example is much susceptible to the kinds of results like the one the original poster reported and later confirmed in the event of a unscheduled host reboot... if the default cache mode was "none" instead "writeback" this would be OK but writeback is known to [by qemu's own documentation and other sources] to be unsafe in a power failure see <a href="http://pic.dhe.ibm.com/infocenter/lnxinfo/v3r0m0/index.jsp?topic=%2Fliaat%2Fliaatbpkvmguestcache.htm.">http://pic.dhe.ibm.com/infocenter/lnxinfo/v3r0m0/index.jsp?topic=%2Fliaat%2Fliaatbpkvmguestcache.htm.</a>.. the only problem with "none" is it gives beyond awful performence)<br>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Feb 6, 2014 at 10:29 AM, Remo Mattei <span dir="ltr"><<a href="mailto:remo@italy1.com" target="_blank">remo@italy1.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="word-wrap:break-word">Yes but raw data keeps the entire space so if you have a 40gb drive and only use 1gb you are stuck with 40gb. Whereas, qcow2 does not. <div><br></div><div>Ciao</div><div>Remo</div><div><br>
<div><div><div class="h5"><div>On Feb 6, 2014, at 9:50, Aryeh Friedman <<a href="mailto:aryeh.friedman@gmail.com" target="_blank">aryeh.friedman@gmail.com</a>> wrote:</div><br></div></div><blockquote type="cite"><div>
<div class="h5"><div dir="ltr">qcow2 is almost certainly the worst choice here because if the hypervisor for some reason becomes unusable then the data is unreadable by some hypervisors... raw is much more portabls<br></div>
<div class="gmail_extra">
<br><br><div class="gmail_quote">On Thu, Feb 6, 2014 at 9:19 AM, Bhattacharjee, Arindam (Arindam) <span dir="ltr"><<a href="mailto:arindam.bhattacharjee@alcatel-lucent.com" target="_blank">arindam.bhattacharjee@alcatel-lucent.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="blue" vlink="purple" lang="EN-US">
<div><p class="MsoNormal"><span style="color:#1f497d">Probably you need to create qcow2 image out of iso image and then use that qcow2 to create VMs from Openstack.<u></u><u></u></span></p><p class="MsoNormal"><span style="color:#1f497d">Follow the instructions similar to this:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><a href="http://docs.openstack.org/image-guide/content/ubuntu-image.html" target="_blank">http://docs.openstack.org/image-guide/content/ubuntu-image.html</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
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<div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Narayanan, Krishnaprasad [mailto:<a href="mailto:narayana@uni-mainz.de" target="_blank">narayana@uni-mainz.de</a>]
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<b>Sent:</b> Thursday, February 06, 2014 7:19 AM<br>
<b>To:</b> <a href="mailto:openstack@lists.openstack.org" target="_blank">openstack@lists.openstack.org</a><br>
<b>Subject:</b> [Openstack] Error while booting VM<u></u><u></u></span></p>
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</div><div><div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><span lang="DE">Hallo all,<u></u><u></u></span></p><p class="MsoNormal"><span lang="DE"><u></u> <u></u></span></p><p class="MsoNormal">Can I seek help for the problem described below?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">I have a VM running Ubuntu 12.04 in my OpenStack cloud and when it boots, I get an error message that says “Error: invalid magic number, error: You need to load the kernel first. Press any key to continue”.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Can I know how to make the VM boot?<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Thanks,<u></u><u></u></p><p class="MsoNormal">
Krishnaprasad<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p>
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