Open Stack

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
http://pic.dhe.ibm.com/infocenter/lnxinfo/v3r0m0/index.jsp?topic=%2Fliaat%2Fliaatbpkvmguestcache.htm...
the only problem with "none" is it gives beyond awful performence)


On Thu, Feb 6, 2014 at 10:29 AM, Remo Mattei <remo at italy1.com> wrote:

> 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.
>
> Ciao
> Remo
>
> On Feb 6, 2014, at 9:50, Aryeh Friedman <aryeh.friedman at gmail.com> wrote:
>
> 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
>
>
> On Thu, Feb 6, 2014 at 9:19 AM, Bhattacharjee, Arindam (Arindam) <
> arindam.bhattacharjee at alcatel-lucent.com> wrote:
>
>>  Probably you need to create qcow2 image out of iso image and then use
>> that qcow2 to create VMs from Openstack.
>>
>> Follow the instructions similar to this:
>>
>> http://docs.openstack.org/image-guide/content/ubuntu-image.html
>>
>>
>>
>>
>>
>> *From:* Narayanan, Krishnaprasad [mailto:narayana at uni-mainz.de]
>> *Sent:* Thursday, February 06, 2014 7:19 AM
>> *To:* openstack at lists.openstack.org
>> *Subject:* [Openstack] Error while booting VM
>>
>>
>>
>> Hallo all,
>>
>>
>>
>> Can I seek help for the problem described below?
>>
>>
>>
>> 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".
>>
>>
>>
>> Can I know how to make the VM boot?
>>
>>
>>
>> Thanks,
>>
>> Krishnaprasad
>>
>>
>>
>>
>>
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>>
>
>
> --
> Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org<http://www.petitecloud.org/>
>  !DSPAM:1,52f3aa0339243727140205!
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>
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>


-- 
Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org
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