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From Edison Su <Edison...@citrix.com>
Subject RE: [RFC]Bypass Libvirt storage pool for NFS
Date Wed, 19 Mar 2014 22:48:40 GMT


> -----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.

> 
> Lucian
> 
> --
> Sent from the Delta quadrant using Borg technology!
> 
> Nux!
> www.nux.ro
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