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From Wido den Hollander <w...@widodh.nl>
Subject Re: [RFC]Bypass Libvirt storage pool for NFS
Date Thu, 20 Mar 2014 18:48:02 GMT


On 03/20/2014 05:38 PM, Nux! wrote:
> On 19.03.2014 22:48, Edison Su wrote:
>>> -----Original Message-----
>>> From: Nux! [mailto:nux@li.nux.ro]
>>> Sent: Wednesday, March 19, 2014 3:34 PM
>>> To: dev@cloudstack.apache.org
>>> Subject: RE: [RFC]Bypass Libvirt storage pool for NFS
>>>
>>> On 19.03.2014 22:28, Edison Su wrote:
>>>>> Edison, if - with the workarounds in place now - the current version
>>>>> of KVM works OK, then why wouldn't a newer version work just as fine?
>>>>> Just trying to understand this.
>>>>
>>>> That's a long story, there is a bug in Libvirt, which is introduced in
>>>> a newer version(>0.9.10), which can make the storage pool disappear.
>>>
>>> Edison, that I understand, but what is the technical reason that
>>> prevents
>>> using newer KVM?
>>> It looks like current KVM works fine on CentOS 6.5 for example which has
>>> libvirt 0.10.2.
>>
>> Yes, at first glance, the newer version libvirt(> 0.9.10) just works
>> fine. But under stress test, it will complain NFS storage pool
>> missing, and can't add the storage pool back, unless you shut down all
>> the VMs which using the storage pool. That's the
>> bug(https://bugzilla.redhat.com/show_bug.cgi?id=977706) all about.
>>
>> In ACS 4.2/4.3 release, we only recommend to use libvirt <=0.9.10, if
>> primary storage is NFS.
>
> Ok, I'm trying to make some noise in that bz entry, hopefully someone
> gets annoyed enough to do something about it.
>

And it just went upstream! How great is that?

> Quick question: there is no problem if instead of using NFS directly we
> use the "shared mount point" option, is it?
>

Probably not, since we would then be mounting the filesystem manually 
instead of having libvirt do it.

I'd say get this patch down into EL6 and I'll try to get it into Ubuntu 
14.04.

Wido

> Lucian
>

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