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From Edison Su <Edison...@citrix.com>
Subject RE: [VOTE] 3rd round of voting for ASF 4.2.1 RC
Date Fri, 03 Jan 2014 18:31:23 GMT


> -----Original Message-----
> From: Nux! [mailto:nux@li.nux.ro]
> Sent: Friday, January 03, 2014 8:37 AM
> To: dev@cloudstack.apache.org
> Subject: Re: [VOTE] 3rd round of voting for ASF 4.2.1 RC
> 
> On 03.01.2014 15:17, Daan Hoogland wrote:
> > I know Hugo made something to include it in the rpm. I'm not sure if
> > this is on the 4.2 branch. Look in the root dir of the archive.
> >
> > @David: you casted a -1. Can you get your conscience to retract that?
> > @all: how do we go from here?
> 
> The RPMs that I used are here in case anyone can work out the commit id,
> http://tmp.nux.ro/w7F-cloudsnap42/
> As far as I am concerned you guys can do your thing and release this.
> 
> Uncharacteristically the change to qemu-img in EL 6.5 not only broke previous
> ACS functionality, but also affected Openstack and I think oVirt, from what I
> figured out searching the net.
> Next time I'll have to remember not to blame ACS first. :)
> 
> AFAIK EL6 users can either stick with 6.4 or older or use
> http://li.nux.ro/download/nux/tmp/kvm-rhev/el6/ - and hope RedHat fixes
> this booboo.

Regarding to KVM binaries, in order to make volume snapshot working with cloudstack, we need
KVM hypervisor support following features:
1. disk only snapshot, don't save vm memory(saving vm memory usually takes several seconds.
In RHEL <6.3, it will even take few minutes for a vm with large memory. It means user vm
will be paused for that long time, during snapshot, which may be not acceptable for many users).
2. be able to backup snapshot from primary storage to secondary storage. 

Few years ago, I send two patches to KVM community: 
[1]http://lists.gnu.org/archive/html/qemu-devel/2010-09/msg00655.html
[2]http://lists.nongnu.org/archive/html/qemu-devel/2010-09/msg01662.html
The [2] is already in KVM upstream, the [1] is not checked in at that time, but it's supported
later on, with the so called "disk-only" snapshot.

In ACS release, we(Citrix QA team) usually test it on RHEL 6, which doesn't have above functionalities,
that's why I say the kvm snapshot is not supported by default. But if you are using latest
kvm distribution, you will get this feature. Maybe we should support newer version of KVM
distribution better, such as the upcoming Ubuntu 14.04 etc?

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