<div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Sun, Oct 1, 2017 at 2:19 AM Ben Bradley <<a href="mailto:listsbb@virtx.net">listsbb@virtx.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 28/09/17 22:27, Ben Bradley wrote:<br>
> On 28/09/17 08:32, Yaniv Kaul wrote:<br>
>><br>
>><br>
>> On Wed, Sep 27, 2017 at 10:59 PM, Ben Bradley <<a href="mailto:listsbb@virtx.net" target="_blank">listsbb@virtx.net</a><br>
>> <mailto:<a href="mailto:listsbb@virtx.net" target="_blank">listsbb@virtx.net</a>>> wrote:<br>
>><br>
>> Hi All<br>
>><br>
>> I'm looking to add a new host to my oVirt lab installation.<br>
>> I'm going to share out some LVs from a separate box over iSCSI and<br>
>> will hook the new host up to that.<br>
>> I have 2 NICs on the storage host and 2 NICs on the new Ovirt host<br>
>> to dedicate to the iSCSI traffic.<br>
>> I also have 2 separate switches so I'm looking for redundancy here.<br>
>> Both iSCSI host and oVirt host plugged into both switches.<br>
>><br>
>> If this was non-iSCSI traffic and without oVirt I would create<br>
>> bonded interfaces in active-backup mode and layer the VLANs on top<br>
>> of that.<br>
>><br>
>> But for iSCSI traffic without oVirt involved I wouldn't bother with<br>
>> a bond and just use multipath.<br>
>><br>
>> From scanning the oVirt docs it looks like there is an option to<br>
>> have oVirt configure iSCSI multipathing.<br>
>><br>
>><br>
>> Look for iSCSI bonding - that's the feature you are looking for.<br>
><br>
> Thanks for the replies.<br>
><br>
> By iSCSI bonding, do you mean the oVirt feature "iSCSI multipathing" as<br>
> mentioned here<br>
> <a href="https://www.ovirt.org/documentation/admin-guide/chap-Storage/" rel="noreferrer" target="_blank">https://www.ovirt.org/documentation/admin-guide/chap-Storage/</a> ?<br>
><br>
> Separate links seems to be the consensus then. Since these are links<br>
> dedicated to iSCSI traffic, not shared. the ovirtmgmt bridge lives on<br>
> top of an active-backup bond on other NICs.<br>
><br>
> Thanks, Ben<br>
<br>
And an extra question about oVirt's iSCSI multipathing - should each<br>
path be a separate VLAN+subnet?<br>
I assume it should be separate VLANs for running separate physical<br>
fabrics if desired.<br></blockquote><div><br></div><div>Check this:<br></div><div><a href="https://www.centos.org/docs/5/html/5.2/DM_Multipath/MPIO_description.html">https://www.centos.org/docs/5/html/5.2/DM_Multipath/MPIO_description.html</a></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
Thanks, Ben<br>
<br>
><br>
>> So what's the best/most-supported option for oVirt?<br>
>> Manually create active-backup bonds so oVirt just sees a single<br>
>> storage link between host and storage?<br>
>> Or leave them as separate interfaces on each side and use oVirt's<br>
>> multipath/bonding?<br>
>><br>
>> Also I quite like the idea of using IPv6 for the iSCSI VLAN, purely<br>
>> down to the fact I could use link-local addressing and not have to<br>
>> worry about setting up static IPv4 addresses or DHCP. Is IPv6 iSCSI<br>
>> supported by oVirt?<br>
>><br>
>><br>
>> No, we do not. There has been some work in the area[1], but I'm not<br>
>> sure it is complete.<br>
>> Y.<br>
>><br>
>> [1]<br>
>> <a href="https://gerrit.ovirt.org/#/q/status:merged+project:vdsm+branch:master+topic:ipv6-iscsi-target-support" rel="noreferrer" target="_blank">https://gerrit.ovirt.org/#/q/status:merged+project:vdsm+branch:master+topic:ipv6-iscsi-target-support</a><br>
>><br>
>><br>
>><br>
>> Thanks, Ben<br>
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>><br>
>><br>
><br>
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</blockquote></div></div>