<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Oct 1, 2017 at 2:18 AM, Ben Bradley <span dir="ltr"><<a href="mailto:listsbb@virtx.net" target="_blank">listsbb@virtx.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On 28/09/17 22:27, Ben Bradley wrote:<br>
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On 28/09/17 08:32, Yaniv Kaul wrote:<br>
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<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> <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>
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<br>
Thanks for the replies.<br>
<br>
By iSCSI bonding, do you mean the oVirt feature "iSCSI multipathing" as mentioned here <a href="https://www.ovirt.org/documentation/admin-guide/chap-Storage/" rel="noreferrer" target="_blank">https://www.ovirt.org/document<wbr>ation/admin-guide/chap-<wbr>Storage/</a> ?<br>
<br>
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.<br>
<br>
Thanks, Ben<br>
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And an extra question about oVirt's iSCSI multipathing - should each path be a separate VLAN+subnet?<br>
I assume it should be separate VLANs for running separate physical fabrics if desired.<br></blockquote><div><br></div><div>Depends on your network architecture. Doesn't have to be.</div><div>Y.</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>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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 sure it is complete.<br>
Y.<br>
<br>
[1] <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/s<wbr>tatus:merged+project:vdsm+bran<wbr>ch:master+topic:ipv6-iscsi-<wbr>target-support</a> <br>
<br>
<br>
Thanks, Ben<br>
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