Hello Maoz,

i'm serving more than 300 vms in fc setup (and growing).

On Thu, Mar 8, 2018 at 12:16 PM, maoz zadok <maozza@gmail.com> wrote:
> Hello All,
> I connected existing data center with NFS storage domain to a new
> Fiber-Channel storage domain according to the following guide, and I have
> three questions.
> https://www.ovirt.org/documentation/install-guide/chap-Configuring_Storage/
>
> 1. why does the storage domain asks me to "Use Host"?

Because there are some operations (lvm initialization & so on) to be
done while setting up the volumes on FC storage. These operations will
be performed by the given host

>
> does it mean that if this host is down there is no access to the FC storage
> or the next available host elected to manage the FC storage?

No, storage is mapped by all the hosts and accessed directly

> does it mean that all the traffic to my storage is routed via the selected
> host?

Absolutely no!

> what is the best practice, do I need to split the workload to other hosts as
> well by letting each host manage one small LUN instead of letting one host
> manage all LUNs or one big LUN?

I supposte that your question is related to the way that FC is
managed. Since every host sees all the drives, there question is no
more appropriate.


>
> 2. is it possible to set the newly created fiber-channel storage(data
> domain) as master?

IIRC if you set to maintenance the existing master, another one will
be selected.

>
> 3. can I easily migrate all VM disks to the FC storage instead of the NFS?
>

Sure, nfs storage domain or fc storage domain doesn't make difference
in terms of interaction. You can move disks from one to the other
without issues.

Luca

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Luca 'remix_tj' Lorenzetto, http://www.remixtj.net , <lorenzetto.luca@gmail.com>