[ovirt-users] Storage over allocation ratio value larger than 125% will pause vms

[Jan Bernard Wevers]

Yaniv,

 

Thanks for your answers. Really appreciate this.

 

As most of the vm’s (70 vm’s of a total of 80) are not running, the risk of getting out of physical disk space is low. The vm’s are pre-installed from a template, installed with application software and will only be powered on when needed.

So most of the vm’s actually allocate no more than 5 GB of physical space (of a virtual size of 35GB). The actual used disk size of all vm’s is about 900GB, leaving 1900GB of free space of a total of 2800GB. The allocated disk space is around 3300GB, making an over allocation ratio of 125%. So in this special case ovirt will pause my vm’s if the ratio will exceed 125%, while still having plenty of physical disk space.

 

You mentioned that it is possible to change the value to a larger value, but I could not find how to do this?

 

Thanks,

Jan Bernard

 

 

From: Yaniv Dary [mailto:ydary at redhat.com] 
Sent: maandag 7 december 2015 12:53
To: Jan Bernard Wevers
Cc: users at ovirt.org
Subject: Re: [ovirt-users] Storage over allocation ratio value larger than 125% will pause vms

 

 




Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
 
Tel : +972 (9) 7692306
        8272306
Email: ydary at redhat.com
IRC : ydary

 

On Mon, Dec 7, 2015 at 12:38 AM, Jan Bernard Wevers <jan.bernard.wevers at group2000.com> wrote:

I’m using ovirt 3.6 and an iscsi storage domain. Almost all vms are using
thin provisioning with a virtual size of 40GB and a typical physical size of
8 GB.
Now I’m facing the fact that ovirt is pausing my vms due to the following
event message:
(Example):  “VM vm_01_16_centos6 has been paused due to no Storage space
error.”

When I look at the iscsi storage domain the over allocation ratio value is
about 127%, but of the 2799GB there is still more than 1500GB available.
My questions:
- Why ovirt is pausing the vms?

 

We have a minimal amount of 1G needed to do storage related actions.

 

- Can I enlarge the over allocation ratio before ovirt is complaining about
storage space?

 

In 3.6 you can change this threshold pre storage, but I would recommend against this. 

 



_______________________________________________
Users mailing list
Users at ovirt.org
http://lists.ovirt.org/mailman/listinfo/users

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ovirt.org/pipermail/users/attachments/20151207/eb969dd5/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 4172 bytes
Desc: not available
URL: <http://lists.ovirt.org/pipermail/users/attachments/20151207/eb969dd5/attachment-0001.p7s>