On Mon, Jul 30, 2018 at 6:46 PM, Jayme <jaymef@gmail.com> wrote:
It's nice to know someone else out there has these questions as well.  What I'd really like confirmation on is basically this:  In a JBOD oVirt HCI configuration with multiple disk devices per host node is it possible to have just one data volume or is it necessary to create multiple data volumes (one or more per each physical disk you want to store vm data on)?   Meaning if I had 4 JBOD disks in each node and I wanted VM data to be stored and accessed on all 4 would I need to create 4 different data volumes (one per disk).  And if so would they have to have unique names and brick dirs/mount points?

The guideline is to create 1 brick per device and this is what the Cockpit UI implements. When you group together all 4 JBOD disks to form 1 brick  - you're essentially setting up 1 large brick without any hardware RAID protection for the disks. Any 1 of the disk failure would cause the entire brick to be unavailable and would require healing the whole brick. So if you had 4 1TB disks, you would end up creating a 4TB brick which needs healing - not the best of scenarios.

Why do you need to create 1 data storage domain instead of multiple?


- James


On Mon, Jul 30, 2018 at 10:09 AM, <william.dossett@gmail.com> wrote:
Hi James... I'm in sort of the same position... I have 6 JBOD drives in each node.  I am unsure if I am going to wind up with 6 data stores.  I have 5 nodes and have other problems related to when I add those nodes further complicating the gluster issue.  Hopefully someone can help clear this up as its the last hurdle I face before starting to actually put work loads on this and connecting it into our ManageIQ environment. 
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