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Does disk space required in compute node when launch instance from block storage?

asked 2018-02-20 03:48:21 -0500

pandi90 gravatar image

Hi,

does disk space required in compute node when launch instance from block storage?

My setup is like 1 controller, 3 compute(each 50GB disk) and 1 cinder storage.. I'm lunching instance from cinder volume. While launching instance does it check disk space available in compute node.

Example I have created 100GB bootable volume and launched as instance, But compute node have only 50GB. Does this instance launch successfully?

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answered 2018-02-26 02:40:52 -0500

tonyp12 gravatar image

I found a solution for this https://ask.openstack.org/en/question... Set your flavours to 0GB disk for root and ephermeral and then it will not consume compute node local disk when you create instances with cinder volume backend

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Yes if you are launching instance from Cinder volume then root disk should be set to zero in flavors

Deepa gravatar imageDeepa ( 2018-02-26 03:03:38 -0500 )edit
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answered 2018-02-26 01:22:44 -0500

Deepa gravatar image

If you are launching instance from cinder volume then there shouldn't be any issues ,you should be able to launch successfully

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I am seeing that the hypervisor stats are showing consumed local disk. This means that after a high consumption, the instances are failing to start with 'no available host' error message.

tonyp12 gravatar imagetonyp12 ( 2018-02-26 02:02:33 -0500 )edit

Yes @tonyp12 ..I too having same issue.Instance not starting shows no available host ..

pandi90 gravatar imagepandi90 ( 2018-02-26 02:20:27 -0500 )edit

Check my link above in this page. The solution is to set your flavors to disk / ephemeral for 0GB. This is if you use cinder back end storage.

tonyp12 gravatar imagetonyp12 ( 2018-02-26 19:26:32 -0500 )edit

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Asked: 2018-02-20 03:48:21 -0500

Seen: 711 times

Last updated: Feb 26 '18