Re: [ovirt-users] Shared vs Local Storage for Datacenters
On Sun, Nov 26, 2017 at 12:25 PM, Shani Leviim wrote: > Hi, > >> I'm wondering at the moment what the actual difference is between >> Shared and Local Storage Datacenters. >> > By definition, taken from here [1], > Local storage: > When you set up a host to use local storage, the host automatically gets > added to a new data center and cluster that no other hosts can be added to. > Multiple host clusters require that all hosts have access to all storage > domains, which is not possible with local storage. > Virtual machines created in a single host cluster cannot be migrated, fenced > or scheduled. > > Shared storage: > Set up NFS shares that will serve as a data domain and an export domain. > Storage data domains can be unattached from a data center and imported to > another data center in the same environment, or in a different environment. > Virtual machines, floating virtual disk images, and templates can then be > uploaded from the imported storage domain to the attached data center. > >> >> As far as I can see a Local DC supports NFS as well which makes it a >> more flexible DC in storage if you ask me, so why do both still exist >> ? >> > In fact by setting a local DC, only one host can be added and there's no > high availability functionality. > According to [2], a local DC supports NFS shares for migration needs. > In case of sharing resources between more that one host, you should use a > Shared DC. > >> >> Is it possible in a decent way to change a running Shared Storage DC >> to a Local one and Keep the NFS shares and add some local mounts for >> specific hosts ? >> > Since a shared DC can support more than one host (while local DC supports > exactly one), it's not possible moving from 'Share' type to a 'Local' type. Depending on your specific needs, you might want to keep using shared storage and use a vdsm hook to attach a local disk. See also: https://github.com/oVirt/vdsm/tree/master/vdsm_hooks Check specifically localdisk, vmdisk, scratchpad. > >> >> I hope someone can clearify! > > Hope it makes more sense. > > > [1] https://www.ovirt.org/documentation/admin-guide/chap-Storage/ > [2] https://bugzilla.redhat.com/show_bug.cgi?id=1302185 > > Regards, > Shani Leviim > > > ___ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users > -- Didi ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Shared vs Local Storage for Datacenters
Hi, I'm wondering at the moment what the actual difference is between > Shared and Local Storage Datacenters. > > By definition, taken from here [1], Local storage: When you set up a host to use local storage, the host automatically gets added to a new data center and cluster that *no other hosts* can be added to. Multiple host clusters require that all hosts have access to all storage domains, which is *not *possible with local storage. Virtual machines created in a single host cluster cannot be migrated, fenced or scheduled. Shared storage: Set up NFS shares that will serve as a data domain and an export domain. Storage data domains can be unattached from a data center and imported to another data center in the same environment, or in a different environment. Virtual machines, floating virtual disk images, and templates can then be uploaded from the imported storage domain to the attached data center. > As far as I can see a Local DC supports NFS as well which makes it a > more flexible DC in storage if you ask me, so why do both still exist > ? > > In fact by setting a local DC, only one host can be added and there's no high availability functionality. According to [2], a local DC supports NFS shares for migration needs. In case of sharing resources between more that one host, you should use a Shared DC. > Is it possible in a decent way to change a running Shared Storage DC > to a Local one and Keep the NFS shares and add some local mounts for > specific hosts ? > > Since a shared DC can support more than one host (while local DC supports exactly one), it's not possible moving from 'Share' type to a 'Local' type. > I hope someone can clearify! > Hope it makes more sense. [1] https://www.ovirt.org/documentation/admin-guide/chap-Storage/ [2] https://bugzilla.redhat.com/show_bug.cgi?id=1302185 *Regards,* *Shani Leviim* ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
Re: [ovirt-users] Shared vs Local Storage for Datacenters
I hope the same as well. Actually I hope this concept could be retired and be able to add any type of storage in any type of DC either it has 1 host or multiple. Regards Fernando On 23/11/2017 17:22, Matt . wrote: Hi Guys, I'm wondering at the moment what the actual difference is between Shared and Local Storage Datacenters. As far as I can see a Local DC supports NFS as well which makes it a more flexible DC in storage if you ask me, so why do both still exist ? Is it possible in a decent way to change a running Shared Storage DC to a Local one and Keep the NFS shares and add some local mounts for specific hosts ? I hope someone can clearify! Cheers, Matt ___ 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
[ovirt-users] Shared vs Local Storage for Datacenters
Hi Guys, I'm wondering at the moment what the actual difference is between Shared and Local Storage Datacenters. As far as I can see a Local DC supports NFS as well which makes it a more flexible DC in storage if you ask me, so why do both still exist ? Is it possible in a decent way to change a running Shared Storage DC to a Local one and Keep the NFS shares and add some local mounts for specific hosts ? I hope someone can clearify! Cheers, Matt ___ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
