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Ah, thanks! I never even noticed that.


On Tue, May 14, 2013 at 7:10 PM, Heling Yao <yaoheling at gmail.com> wrote:

> Thanks for sharing this. Kernel 3.5.0 is in official ubuntu repo, and one
> can install by apt-get install.
>
> Cheers,
>
> Heling
>
>
> On Tue, May 14, 2013 at 11:03 PM, Joe Topjian <joe.topjian at cybera.ca>wrote:
>
>> Hello,
>>
>> I thought I would post this due to the frequent Gluster talk on the list:
>>
>> Just an FYI for anyone thinking of using this volume driver: make sure
>> you are using a kernel greater than 3.3. For Ubuntu 12.04, the 3.4 kernel
>> found here works:
>> http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4-precise/
>>
>> The reason for this is that Nova tries to attach the volume using
>> cache="none". This requires the filesystem to support O_DIRECT, which is
>> only available for FUSE-based filesystems in kernels above 3.3.
>>
>> When trying to attach a gluster-based volume to an instance on a compute
>> node that runs a kernel below 3.3 (eg the stock Ubuntu 12.04 kernel), you
>> will get a very helpful error message of "DeviceIsBusy: The supplied device
>> (vdx) is busy)"...
>>
>> Hopefully this saves someone the 2 hours of troubleshooting that I went
>> through to figure out the real answer  :)
>>
>> This morning I went to file a bug and saw one has already filed:
>> https://bugs.launchpad.net/nova/+bug/1177103
>>
>> I love when that happens when you already know the answer you're looking
>> for  :)
>>
>> I will also be amending the Gluster volume driver docs to note this.
>>
>> Finally, this issue seems to be resolved for using Gluster as an instance
>> store. If I remember right, I ran into this same issue several months ago
>> and it was resolved by updating the kernel. Seems like Grizzly correctly
>> detects if O_DIRECT is available or not.
>>
>> Thanks,
>> Joe
>>
>> --
>> Joe Topjian
>> Systems Administrator
>> Cybera Inc.
>>
>> www.cybera.ca
>>
>> Cybera is a not-for-profit organization that works to spur and support
>> innovation, for the economic benefit of Alberta, through the use
>> of cyberinfrastructure.
>>
>> _______________________________________________
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>> OpenStack-operators at lists.openstack.org
>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
>>
>>
>


-- 
Joe Topjian
Systems Architect
Cybera Inc.

www.cybera.ca

Cybera is a not-for-profit organization that works to spur and support
innovation, for the economic benefit of Alberta, through the use
of cyberinfrastructure.
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