On Wed, Mar 13, 2024 at 6:07 AM Erhan T via Users <users@ovirt.org> wrote:

Hi,

We have oVirt v4.4.9 environment on our organizitaion. There are 2TB storage domains which have one LUN each and the storage type is Fibre Channel.
I would like to add 10TB or more sized LUNs and reduce the number of storage domain. Is it possible?

Is there any limitation for storage domain size in this version of oVirt? I’m looking for documentation about this subject but I couldn't find any information.

I would be so glad if you could help me.

I would say that you can refer to this article for the downstream RHV product:

https://access.redhat.com/articles/906543

for sure it refers to something tested.

From what I see in section "RHV Manager Logical Entity Maximums:"

Maximum disk size: 500 TiB (limited to 8 TiB by default)

not so clear if it refers to the LUN to attach to the hosts or to virtual disk size or what.

And it is not clear the "limited to 8 TiB" part: if configurable at vdsm host side or what.

Possibly the sample vdsm.conf file at /usr/share/doc/vdsm/vdsm.conf.sample on your host could help investigating the available parameters

See also here for backgrounds related to having too many LVMs (that map to virtual disks) in a single volume group (that maps to storage domain), in case of block storage over FCP for example.

https://access.redhat.com/solutions/441203

From the documentation it seems that the trade-off is something around 300-350 virtual disks: depending on your planned virtual disks' size you can estimate the optimal size for your single storage domain.

HIH a bit

Gianluca