Thank you very much, Mr Leviim! This made things clear.
Eduardo Mayoral Jimeno (emayo...@arsys.es) Administrador de sistemas. Departamento de Plataformas. Arsys internet. +34 941 620 145 ext. 5153 On 28/08/17 11:14, Shani Leviim wrote: > Hi Eduardo, > Welcome aboard! > > First, you may find some relevant information in here: > http://www.ovirt.org/documentation/admin-guide/administration-guide/ > <http://www.ovirt.org/documentation/admin-guide/administration-guide/> . > > Regarding your questions: > * A data domain in an oVirt Data Center must be available to every > Host on the Data Center: Am I right? > Yes, you're right. > > * Can I manually migrate VMs between Datacenters? > VM migration can't be performed between data canters, so you can't use > the 'migrate VM' function. > In order to "migrate" your VM between different data canters, you can > use 'export' and 'import' functions and an 'export domain': > By creating an export domain for one of your DC's (each DC can have up > to one export domain), and exporting your VM to that storage domain, > you can then detach the export domain from that DC and attach it to > the other DC, and by importing there your VM you'll finish the > transaction. > > Another option is to detach the VM's storage domain from one DC and > attach it the second one. > That way you'll move the whole storage domain between your DCs. > > If you have any further questions, don't hesitate to ask :) > > *Regards, > * > *Shani Leviim > * > > On Thu, Aug 24, 2017 at 2:51 PM, Eduardo Mayoral <emayo...@arsys.es > <mailto:emayo...@arsys.es>> wrote: > > Hi, > > First of all, sorry for the naive question, but I have not > been able > to find good guidance on the docs. > > I come from the VMWare environment, now I am starting to migrate > some workload from VMWare to oVirt (v4.1.4 , CentOS 7.3 hosts). > > In VMWare I am used to have one datacenter, several host clusters, > and a bunch of iSCSI Datastores, but we do not map every iSCSI > LUN/datastore to every host. Actually we used to do that, but we hit > limits on the number of iSCSI paths with our infrastructure. > > Rather than that, we have groups of LUNs/Datastores mapped to the > ESXi hosts which form a given VMware cluster. Then we have a couple of > datastores mapped to every ESXi in the vmware datacenter, and we use > those to store the ISO images and as storage that we use when we > need to > migrate VMs between clusters for some reason. > > Given the role of the Master data domain and the SPM in oVIrt > it is > my understanding that I cannot replicate this kind of setup in > oVirt: a > data domain in an oVirt Data Center must be available to every Host on > the Data Center: Am I right? > > So, our current setup is still small, but I am concerned that > as it > grows, if I stay with one Datacenter, several clusters and a group of > data domains mapped to every host I may run again into problems > with the > number of iSCSI paths (the limit in VMWare was around 1024), it is > easy > to reach that limit as it is (number of hosts) * (number of LUNs) * > (number of paths/LUN). > > If I split my setup in several datacenters controlled by a single > oVirt-engine in order to keep the number of iSCSI paths > reasonable. Can > I manually migrate VMs between Datacenters? I assume that in order > to do > that, those datacenters will need to share some data domain , Can this > be done? Maybe with NFS? > > Thanks for your help! > > -- > Eduardo Mayoral Jimeno (emayo...@arsys.es <mailto:emayo...@arsys.es>) > Administrador de sistemas. Departamento de Plataformas. Arsys > internet. > +34 941 620 145 ext. 5153 <tel:%2B34%20941%20620%20145%20ext.%205153> > > _______________________________________________ > Users mailing list > Users@ovirt.org <mailto:Users@ovirt.org> > http://lists.ovirt.org/mailman/listinfo/users > <http://lists.ovirt.org/mailman/listinfo/users> > >
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