[Users] RAID1 mirror on ovirt-node + engine nfs server

[Mike Burns]

On 07/04/2013 12:18 PM, Jason Keltz wrote:
> Hi.
>
> I've been reading about ovirt, and ready to try my own experiments with
> it.  I have two small questions..
>
> When an ovirt-node is installed from the standard ISO, there's no
> mention in the documentation about setting up a RAID1 mirror for the
> root disk on the node.  I'm sure that once I get around to working out
> kickstarting the node, I could easily install the raid1 mirror, but I'm
> just wondering why I don't see that in the default ISO. Maybe I'm just
> missing something.  Is redundancy of the disk on the node not
> important?  Sure, if the node goes down, I guess the VMs could be run on
> other nodes, but if we can prevent the node from going down in the first
> place, then why not?

If your server has hardware raid and presents the array as a single 
device to oVirt Node, then it should work.  If it's not true hardware 
raid (it generates a dmraid or mdraid device), it won't work.

In general, the disk image for the node is not important.  The important 
storage is usually shared from an external system (NFS, iSCSI, FC). 
Installation/Re-installation is usually very easy to do, so Raid arrays 
of local disks in oVirt Node was not a requirement.  We may add support 
for this in the future (or will accept patches adding support), but it 
was not an important enough requirement previously.


As for Engine...I'll defer that to the people who know engine better...

Mike

>
> I also have a question about the storage backend.  In particular, I have
> a pretty powerful server that I intend to use as the NFS server, and a
> few servers to use as nodes.  On the other hand, I don't have a powerful
> machine (at the moment) to use for the ovirt-engine.  Would it be poor
> practice to run the ovirt-engine ON the NFS server?  During engine
> setup, I see that you can setup an NFS share for ISOs from the
> ovirt-engine, but I don't think there's mention of just generalized
> storage there.  I suspect it's "poor practice", but I thought I'd ask
> anyway.   My setup will be relatively small (say, 4 nodes), and this
> would let me reduce 1 general server from the infrastructure (dedicated
> ovirt-engine).
>
> Thanks! :)
>
> Jason.
>
> ps: At the moment, I am not subscribed to users - please cc: me on
> responses.
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