<div dir="ltr"><div><div><div><div><div><div>In several virtualization systems you can have a virtual disk drive:<br><br></div>-thick, so a thick disk of 100gb uses 100gb of space;<br></div>-thin, so a thin disk of 100gb uses 0gb when empty and starts using space when the virtual machine fills it.<br>
<br></div><div>So I can have a real hdd of 250gb with inside ten virtual thin disks of 1000gb each, if they are almost empty.<br></div><div><br></div>I have checked again and ceph rbd are "thin". <br><br></div>BTW: I thank you for you explanation of persistent/not persistent, I was not able to find it in docs. Can you explain me also what a "volatile disk" is? <br>
</div><div>A not persistent image is writeable?<br></div>When you reboot a vm with a not persistent image you lose all datda written to it?<br><br></div>Thanks again,<br>Mario<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">
2013/12/12 Kenneth <span dir="ltr"><<a href="mailto:kenneth@apolloglobal.net" target="_blank">kenneth@apolloglobal.net</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p>Hi,</p>
<p>Can you elaborate more on what you want to achieve?</p>
<p>If you have a 100GB image and it is set to persistent, you can instantiate that image immediately and deploy/live migrate it to any nebula node. Only one running instance of VM of this image is allowed.</p>
<p>If it is a 100GB non persistent image, you'll have to wait for ceph to "create a copy" of it once you deploy it. But you can use this image multiple times simutaneously.</p>
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<pre><span style="font-size:small;font-family:verdana,geneva"><span style="font-size:x-small;font-family:helvetica">Thanks,
Kenneth</span><br><span style="font-size:x-small;font-family:helvetica">Apollo Global Corp.</span><br></span></pre>
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<p>On 12/11/2013 07:28 PM, Mario Giammarco wrote:</p>
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<div>Hello,</div>
I am using ceph with opennebula.</div>
I have created a 100gb disk image and I do not understand if it is thin or thick.<br><br></div>
I hope I can have thin provision.<br><br> Thanks,<br>Mario</div>
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