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

[Yaniv Kaul]

On Thu, Sep 28, 2017 at 1:54 PM, Nir Soffer <nsoffer at redhat.com> wrote:

>
>
> On Wed, Sep 27, 2017 at 11:01 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.
>>
>> 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?
>

If the link is not only for storage traffic, then it makes sense to use
bonding.
Active-Active is much better, of course, if possible.
Y.


>
>
>> 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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>>
>
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