[Users] oVirt 3.5 planning

[Itamar Heim]

On 02/25/2014 03:30 PM, Sven Kieske wrote:
> Well, afaik the current workflow is like this:
>
> I have iso domain (hosted on NFS server) a, attached to host b.
>
> On host b I got vms c,d and e.
>
> When I attach an ISO from a to c, the iso gets
> copied from the NFS server to /var/run/vdsm/payload/{UUID}/..
>
> When I attach the same ISO file from a to d the very same iso
> file gets copied again to /var/run/vdsm/payload/{UUID_2}/ from
> the NFS server.

linked, not copied?!

>
> This is unnecessary because there is already a copy of the iso in
> the locale filesystem, so it would be cool if this is stored in a
> way that multiple vms on the same host can utilize the same iso file
> without downloading it multiple times.
>
> I hope I described the workflow in a correct way.
> If this is done already I am not aware of it, so please correct
> me if I'm wrong.
>
> An additional side effect would be that you can utilize this locally
> stored iso files while the NFS server or the ISO Domain is in
> maintenance mode for some reason. Or if you have a network maintenance
> for the network path which leads to the ISO Domain.
>
> Of course this just works if the host has enough ram or dedicated local
> storage to store these copies.
>
> I know that you can circumvent this, by using a locally created ISO
> Domain on the host itself. But then you lose the ability of sharing
> this ISO domain with different DCs, don't you?
>
>
> Am 25.02.2014 14:16, schrieb Itamar Heim:
>> On 02/25/2014 11:55 AM, Sven Kieske wrote:
>>> RFE: Allow multiple local storage domains/ hosts within a cluster
>>> with automigration via export domains (vm has to be shut down)
>>> I will write a detailed BZ for this.
>>
>> this can only happen after we finish the removal of storage pool aspects
>> (which is currently being worked on)
>>
>>>
>>> RFE: temporary copys of iso-images on hosts which get mounted from
>>> iso domains into vms, this would allow to detach an iso domain while
>>> isos are attached and would also lower network traffic when an iso
>>
>> what's the use case for detaching an iso domain making this worth while?
>> (it will also kill live migration, or force it to become live storage
>> migration for the iso)
>
>