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

[Yaniv Kaul]

On Sun, Oct 1, 2017 at 2:18 AM, Ben Bradley <listsbb at virtx.net> wrote:

> On 28/09/17 22:27, Ben Bradley wrote:
>
>> On 28/09/17 08:32, Yaniv Kaul wrote:
>>
>>>
>>>
>>> On Wed, Sep 27, 2017 at 10:59 PM, Ben Bradley <listsbb at virtx.net
>>> <mailto: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.
>>>
>>
>> Thanks for the replies.
>>
>> By iSCSI bonding, do you mean the oVirt feature "iSCSI multipathing" as
>> mentioned here https://www.ovirt.org/documentation/admin-guide/chap-
>> Storage/ ?
>>
>> Separate links seems to be the consensus then. Since these are links
>> dedicated to iSCSI traffic, not shared. the ovirtmgmt bridge lives on top
>> of an active-backup bond on other NICs.
>>
>> Thanks, Ben
>>
>
> And an extra question about oVirt's iSCSI multipathing - should each path
> be a separate VLAN+subnet?
> I assume it should be separate VLANs for running separate physical fabrics
> if desired.
>

Depends on your network architecture. Doesn't have to be.
Y.


>
> Thanks, Ben
>
>
>>     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+bran
>>> ch:master+topic:ipv6-iscsi-target-support
>>>
>>>
>>>     Thanks, Ben
>>>     _______________________________________________
>>>     Users mailing list
>>>     Users at ovirt.org <mailto:Users at ovirt.org>
>>>     http://lists.ovirt.org/mailman/listinfo/users
>>>     <http://lists.ovirt.org/mailman/listinfo/users>
>>>
>>>
>>>
>> _______________________________________________
>> Users mailing list
>> Users at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ovirt.org/pipermail/users/attachments/20171001/1065ccf8/attachment.html>