[Kimchi-devel] Kimchi-devel Digest, Vol 23, Issue 121

[Aline Manera]

On 27/10/2015 15:50, Daniel Henrique Barboza wrote:
>
>
> On 10/27/2015 03:27 PM, Frank Novak wrote:
>>
>>
>>
>>
>> kimchi-devel-bounces at ovirt.org wrote on 10/27/2015 12:00:03 PM:
>>
>> > On 10/27/2015 11:13 AM, Frank Novak wrote:
>> > >
>> > >
>> > >
>> > >
>> > > kimchi-devel-bounces at ovirt.org wrote on 10/27/2015 08:31:49 AM:
>> > >
>> > > > Date: Mon, 26 Oct 2015 16:08:11 -0200
>> > > > From: <dhbarboza82 at gmail.com>
>> > > > To: Kimchi Devel <kimchi-devel at ovirt.org>
>> > > > Subject: [Kimchi-devel] [PATCH 0/3] Live migration backend
>> > > > Message-ID: 
>> <1445882894-10208-1-git-send-email-dhbarboza82 at gmail.com>
>> > > >
>> > > > From: Daniel Henrique Barboza <dhbarboza82 at gmail.com>
>> > > >
>> > > > This patch series implements the first release of the Live (and 
>> cold!)
>> > > > migration in Kimchi.
>> > > >
>> > > > *** Requirements for a VM migration ***
>> > > >
>> > > > - shared storage. The disk/storage path must be the same at the 
>> origin
>> > > > and destination.
>> > > Is this a temporary restriction in kimchi?
>> > > We otherwise do support live migration w/ storage...
>> > >
>> >
>> > I guess I've expressed myself poorly there. What I meant was that 
>> the VM
>> > must be in the same
>> > storage pool at both hosts (shared storage). For example, a NFS/iSCSI
>> > storage pool that contains
>> > both the source and destination. The idea is that the migration 
>> process
>> > will only copy the VM
>> > RAM - the disks would be accessible by the VM at the destination from
>> > the same path.
>> >
>> > I am aware that there is an option to copy the storage (non-shared
>> > storage migration) but I've found
>> > out that it isn't that supported by Red Hat for example:
>> >
>> > https://access.redhat.com/solutions/60034
>> >
>> > "Live migration with non-shared storage in RHEL6/RHEV3.* is a 
>> deprecated
>> > functionality, but under certain circunstances and with some
>> > limitations, it works fine. In RHEL7, this feature has been disabled."
>> >
>> >
>> > However, if some distro that Kimchi supports still have support for 
>> non
>> > shared migration, we can
>> > add this option as well.
>> >
>> well, PowerKVM at least does..
>> I haven't checked whether Ubuntu or SLES KVM do..
>>
> Fair enough. I'll add this support in the next version of this backend
>

Daniel, we can follow the same logic we did for ISO streaming which does 
not have support on RHEL7 and disable the feature only when the distro 
does not have support for it.
About the code, you can add a feature test to cover it.

>>
>> > > >
>> > > > - password-less login
>> > > >
>> > > > - enough resorces in the destination host to allocate the VM
>> > > >
>> > > >
>> > > > Limitations of this first version and possible candidates for 
>> future
>> > > work:
>> > > >
>> > > > - do not automate the process of password-less login (but it is 
>> able to
>> > > > verify this condition)
>> > > >
>> > > > - due to the above limitation, the 'user' parameter value is 
>> only 'root'
>> > > > at this moment
>> > > >
>> > > > - do not verify the 'shared storage' condition
>> > > >
>> > > > - do not verify same hypervisor/arch conditions
>> > > >
>> > > > - the origin VM will shutdown after migration (not sure if can be
>> > > helped)
>> > > >
>> > > Ahh, shutdown where, if it was running on source, it should be 
>> running
>> > > on destination..
>> > > clearly it will not be on source anymore..
>> > >
>> > Yeah, that was my reasoning when seeing the VM shutting down
>> > automatically in the
>> > source after the migration was successful.
>> >
>> >
>> >
>> >
>> > Daniel
>> >
>> >
>>
>>
>> Cheers,
>> Frank
>>
>>
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>
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