On Wed, Sep 27, 2017 at 10:59 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.

Look for iSCSI bonding - that's the feature you are looking for.

 

So what's the best/most-supported option for oVirt?
Manually create active-backup bonds so oVirt just sees a single storage link between host and storage?
Or leave them as separate interfaces on each side and use oVirt's multipath/bonding?

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?

No, we do not. There has been some work in the area[1], but I'm not sure it is complete.
Y.

[1] https://gerrit.ovirt.org/#/q/status:merged+project:vdsm+branch:master+topic:ipv6-iscsi-target-support
 

Thanks, Ben
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