----- Original Message ----- > 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?!
I think this needs to be stressed to prevent any misunderstanding. There is NO data copy going on, a simple symbolic link is all. > > > > > 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) > > > > > > _______________________________________________ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users