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Resize an instance with flavor's disk over volume capabicility?

asked 2014-10-21 21:04:41 -0500

anhdenday gravatar image

updated 2014-10-21 21:09:44 -0500

Dear All,

I have a question. I create an instance that it's boot from volume with flavor as below.

2GB RAM | 1 VCPU | 20.0GB Disk

This instance is booted from the volume 50G. So as I understand 20G of flavor's disk must be inside of 50G of volume. It's mean that 50G of volume must be contain 20G of flavor's disk. But when I resize this instance to another flavor that's flavor's disk is over volume capability as below.

8GB RAM | 4 VCPU | 80.0GB Disk

Why it also ok? Resize is successfully. So which one is root disk?

Thanks you so much

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answered 2014-10-22 06:19:13 -0500

jtaguinerd gravatar image

Hi, Based from experience, since I am also using Ceph in all our deployments, when you launched an instance with boot from volume, the disk specs is not being use at all. The only thing that matters is the RAM and and CPU. You may confirm this inside the VM when you do fdisk -l, the disk size remains the same as what you have used when you created the volume.

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Thanks you for your answer. :)

anhdenday gravatar imageanhdenday ( 2014-10-23 10:55:31 -0500 )edit

Dear jtaguinerd

Can you answer me this question:

https://ask.openstack.org/en/question/51600/how-can-i-restorebackup-from-volumesnapshot/
anhdenday gravatar imageanhdenday ( 2014-10-28 22:36:23 -0500 )edit

I just did. Hope it can help you.

jtaguinerd gravatar imagejtaguinerd ( 2014-10-30 21:06:49 -0500 )edit

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Asked: 2014-10-21 21:04:41 -0500

Seen: 1,218 times

Last updated: Oct 22 '14