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

[Nir Soffer]

On Sun, Oct 1, 2017 at 2:19 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.
>

Check this:
https://www.centos.org/docs/5/html/5.2/DM_Multipath/MPIO_description.html


>
> 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+branch:master+topic:ipv6-iscsi-target-support
> >>
> >>
> >>
> >>     Thanks, Ben
> >>     _______________________________________________
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> >>     <http://lists.ovirt.org/mailman/listinfo/users>
> >>
> >>
> >
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