Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

iSCSI MPIO disconnections

Posted on 2014-04-10
6
585 Views
Last Modified: 2014-04-17
Hello Experts,

We have a test cluster setup with MPIO and all seems to be working well.
The setup is using Windows Server 2012 r2 with a qnap as the backend storage.

Routes are as follows;
172.16.10.10 (qnap port 1)
172.17.10.10 (qnap port 2)

Traffic flows perfectly over each switch with the failover link using MPIO working fine.
The issue we are facing is whenever we disconnect our first link to the qnap to tesy the failover (port 1) the other link kicks in fine however when we restore the 172.16.10.10 link it doesn't automatically map the iSCSI target. So if link 2 (port 2) was to fail the entire cluster fails until we either reconnect the iSCSI target manually or we reboot the server.

My impression is that when a link goes down the other kicks in and once the first link is repaired it should automatically reconnect to the target?

Is there an automatic reconnect setting I'm missing?

Thanks people!
0
Comment
Question by:dqnet
  • 3
  • 3
6 Comments
 
LVL 17

Expert Comment

by:Brad Bouchard
ID: 39992619
This is ironic, but my search for auto reconnect turned this up:

http://serverfault.com/questions/588177/iscsi-mpio-disconnections

Look familiar?
0
 

Author Comment

by:dqnet
ID: 39994699
Had to try all my options.. :)

Any opinions on the question though?
0
 
LVL 17

Accepted Solution

by:
Brad Bouchard earned 500 total points
ID: 39994722
Great question first of all, because there are a ton of people who probably have the same question.  I know I did at one point.

As far as my advice on it, I would have gone down the same path as the user who answered your question on serverfault.com, however the one thing that I wanted to add originally and stopped myself from doing after seeing his 2nd reply was about the Round Robin.  As far as performance goes as long as you have your MPIO targets correctly configured in Hyper-V, or in VMware iSCSI kernels (one per iSCSI target by the way if you ever do VMware), then the hypervisor (Hyper-V in this case) looks for the least used/optimized path/target to send the next connection or set of data over.  I didn't want to sound like I copied him, but Round Robin coupled with the advice he gave you on the active/primary paths makes for some great failover.
0
Three Reasons Why Backup is Strategic

Backup is strategic to your business because your data is strategic to your business. Without backup, your business will fail. This white paper explains why it is vital for you to design and immediately execute a backup strategy to protect 100 percent of your data.

 

Author Comment

by:dqnet
ID: 39998287
Hi Brad,

Thanks for the thumbs up.
I am just a little confused as to what you mean if it is configured correctly in HyperV?
We just use standard Windows Clustering Service.. Is there further setup involved in acheiving MPIO in the HyperV setup after the above?

Thanks mate!
0
 
LVL 17

Expert Comment

by:Brad Bouchard
ID: 39999050
I am just a little confused as to what you mean if it is configured correctly in HyperV?
We just use standard Windows Clustering Service.. Is there further setup involved in acheiving MPIO in the HyperV setup after the above?
No worries.  Simply put, what I meant was that there were only really two big things to check on and that was if Round Robin was selected and the active/primary target, both of which you already have.  My comment was more for historical purposes so that when someone else reads this post who has the same question/problem as you they will know those are the two key points.

You are golden my friend.
0
 

Author Comment

by:dqnet
ID: 40007270
Hello again Brad,

Sorry for the delay mate.. I wanted to test it and make sure it all worked first.
And goes what.. It did. What a great setup. It's all switching across seamlessly.
I did have to delete all connections and Luns and rebuilt the entire iSCSI setup but it worked perfectly.

Hope this helps anyone!

Thanks again mate.
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Concerto Cloud Services, a provider of fully managed private, public and hybrid cloud solutions, announced today it was named to the 20 Coolest Cloud Infrastructure Vendors Of The 2017 Cloud  (http://www.concertocloud.com/about/in-the-news/2017/02/0…
When we purchase storage, we typically are advertised storage of 500GB, 1TB, 2TB and so on. However, when you actually install it into your computer, your 500GB HDD will actually show up as 465GB. Why? It has to do with the way people and computers…
This Micro Tutorial will teach you how to reformat your flash drive. Sometimes your flash drive may have issues carrying files so this will completely restore it to manufacturing settings. Make sure to backup all files before reformatting. This w…
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question