<div dir="ltr">Nice, now it's crystal clear. This is an Huawei Oceanstor disk array which we want to test with ovirt so we can see performance, how ovirt behaves with situations where one controller is disconnected etc., that's why we wanted to implement multipath.<div><br></div><div>Thanks for the insight!</div><div><br></div><div>James</div></div><div class="gmail_extra"><br><div class="gmail_quote">2016-08-04 15:42 GMT+01:00 Dan Yasny <span dir="ltr"><<a href="mailto:dyasny@gmail.com" target="_blank">dyasny@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote"><span class="">On Thu, Aug 4, 2016 at 10:37 AM, James Michels <span dir="ltr"><<a href="mailto:karma.sometimes.hurts@gmail.com" target="_blank">karma.sometimes.hurts@gmail.<wbr>com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr"><div class="gmail_quote"><div dir="ltr">Hi Dan,<div><br></div><div>The way you describe it I should have 2 storage backends with 2 IPs for the same SAN backend, right? </div></div></div></div></div></div></blockquote><div><br></div></span><div>Every iSCSI SAN has multiple portals (usually one on each storage controller, and each with it's own IP), and when you create a target you assign it the portals through which it should be accessible. So if you have two portals (two IPs) assigned to a target (LUN), you can access it via two paths, each path leading through a different portal/IP to the same target/LUN.</div><div>What do you use for your iSCSI backend? </div><span class=""><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr"><div class="gmail_quote"><div dir="ltr"><div>The problem I see is that when you create a disk for a VM, you assign it to only one storage domain... so if the first fails, how will oVirt know which one should use as failover?</div><div><br></div></div></div></div></div></div></blockquote><div><br></div></span><div>There is only one disk, but it sits on a target, which can be accessed via two different IPs. oVirt stores all the iSCSI portal IPs you give it as described in my first response in a database, and connects to them when connecting to the storage domain. If one is down, multipath will mark the path as down and keep using other IPs to access the same LUN</div><span class=""><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr"><div class="gmail_quote"><div dir="ltr"><div></div><div>Thank you</div></div><div><div><div class="gmail_extra"><br><div class="gmail_quote">2016-08-04 15:20 GMT+01:00 Dan Yasny <span dir="ltr"><<a href="mailto:dyasny@gmail.com" target="_blank">dyasny@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Normally you<div>1. enter the IP</div><div>2. click discover</div><div>3. login to whatever was found</div><div>4. enter another IP instead of the first</div><div>5. goto 2 </div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div>On Thu, Aug 4, 2016 at 10:13 AM, James Michels <span dir="ltr"><<a href="mailto:karma.sometimes.hurts@gmail.com" target="_blank">karma.sometimes.hurts@gmail.<wbr>com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr">Hello,<div><br></div><div>I want to add an iSCSI based storage domain. For that I add a domain on the Storage tab with one of the IPs (say 10.10.10.1), but for failover purposes I'd like to use multipath to add a failover IP so if the first one fails, LUNs can be reached via the second (say 10.10.10.2).</div><div><br></div><div>How can this be done in oVirt 4.0.1? I have not seen a way how to add the second IP for multipath purposes.</div><div><br></div><div>Thank you</div><span><font color="#888888"><div><br></div><div>James</div>
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