On Wed, Sep 27, 2017 at 11:01 PM Ben Bradley <listsbb@virtx.net> wrote:

Hi All

I'm looking to add a new host to my oVirt lab installation.
I'm going to share out some LVs from a separate box over iSCSI and will
hook the new host up to that.
I have 2 NICs on the storage host and 2 NICs on the new Ovirt host to
dedicate to the iSCSI traffic.
I also have 2 separate switches so I'm looking for redundancy here. Both
iSCSI host and oVirt host plugged into both switches.

If this was non-iSCSI traffic and without oVirt I would create bonded
interfaces in active-backup mode and layer the VLANs on top of that.

But for iSCSI traffic without oVirt involved I wouldn't bother with a
bond and just use multipath.

 From scanning the oVirt docs it looks like there is an option to have
oVirt configure iSCSI multipathing.

So what's the best/most-supported option for oVirt?

oVirt support only multipath devices, so the best way is to use multipath

features.

 

Manually create active-backup bonds so oVirt just sees a single storage
link between host and storage?

This will always be on top of multipath device, giving you the same 

capabilities, so why would you want to do that? 

 

Or leave them as separate interfaces on each side and use oVirt's
multipath/bonding?

Yes.

 

Also I quite like the idea of using IPv6 for the iSCSI VLAN, purely down
to the fact I could use link-local addressing and not have to worry
about setting up static IPv4 addresses or DHCP. Is IPv6 iSCSI supported
by oVirt?

Thanks, Ben
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