[ovirt-devel] Shared gluster storage domain for templates

[Christopher Pereira]

Hi,

I'm trying to setup a gluster data storage domain exclusively for 
templates (read only) and share it among different geo distributed ovirt 
data centers.
I believe this is a common requirement.
Do you know if there is a clean/efficient way to do this?

My experiment:

I geo-replicated the templates storage domain in order to keep a local 
copy on each data center for faster new VM instantiation or thin 
template provisioning.
The problem I faced is it's not possible to import a replicated storage 
domain when the original Storage Domain UUID is already registered in 
the same Engine installation.
A workarround was to detach the original SD (from Data Center 1) and 
attach the replicated SD (on Data Center 2)...or use another Engine 
installation.
This works, but still requires to detach and reattach the storage domain.

Is there anyway to copy a storage domain or change its UUID?
I guess I can change the Storage Domain UUID (dirname and 
dom_md/metadata), but I'm afraid of the multiple references inside the 
binary file 'dom_md/ids'.

BTW, using a gluster replica-n volume seems to be the cleanest solution 
because this way Engine would only be showing one single templates 
storage domain (ideal).
The only reason I didn't go this way is because it is not designed 
between geo distributed data networks.