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

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(a)virtx.net >> <mailto: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. >> > > 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.

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(a)ovirt.org <mailto:Users@ovirt.org> >> http://lists.ovirt.org/mailman/listinfo/users >> <http://lists.ovirt.org/mailman/listinfo/users> >> >> >> > _______________________________________________ > Users mailing list > Users(a)ovirt.org > http://lists.ovirt.org/mailman/listinfo/users >