[ovirt-users] iSCSI VLAN host connections - bond or multipath & IPv6

[Yaniv Kaul]

On Wed, Sep 27, 2017 at 10:59 PM, Ben Bradley <listsbb at 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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