Solved

Can I use pass-through disks in a Hyper-V cluster to eliminate the VHD size limitation?

Posted on 2010-09-08
2
1,071 Views
Last Modified: 2013-11-11
Greetings -

I'm stuck in a situation where I'm going to create a Cluster Shared Volume (CSV) to host 4 VMs.  Unfortunately, one of these VMs needs a data disk larger than 2 TB so that means I can't use a VHD as the VHD size limitation is 2 TB.

I figured I would create a pass-through disk.  What I don't know is... can I do this in a clustered configuration?  In other words, will the pass through disk follow from host to host assuming the zoning and LUN configuration is done properly?

The confusing part to me is... from the host perspective, the pass through disk must be OFFLINE.  I'm not sure an offline resource can follow/fail from node to node.

Is this a legitimate configuration?  Can I have as many disks/VHDs as possible on the Cluster Shared Volume and then have this one pass through disk for one of the VMs hosted on a separate LUN and have the cluster work?

Hopefully this makes sense.  Let me know if you need any additional data to help answer.
0
Comment
Question by:amendala
[X]
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
2 Comments
 
LVL 15

Accepted Solution

by:
msmamji earned 500 total points
ID: 33632826
I figured I would create a pass-through disk. What I don't know is... can I do this in a clustered configuration? In other words, will the pass through disk follow from host to host assuming the zoning and LUN configuration is done properly?
Yes, you can do it in a clustered configuration, you can add a pass through disk to a HAVM. Here is how.
http://blogs.technet.com/b/askcore/archive/2009/02/20/adding-a-pass-through-disk-to-a-highly-available-virtual-machine.aspx

Is this a legitimate configuration? Can I have as many disks/VHDs as possible on the Cluster Shared Volume and then have this one pass through disk for one of the VMs hosted on a separate LUN and have the cluster work?
Yep. Infact that is the only way this would work in a cluster. You do have the option of using the local disk (on a node) as pass-through but that would not work for HAVM, as the disk would be local to the node.

For the sake of completion, there is one more option, you have when you want to exceed beyond the 2040 GB limit of the VHD/disk for a VM, but I would not recommend it. You can have multiple VHDs added to the VM and then make a software RAID from inside the VM. Software RAID in windows are limited to RAID0, RAID1 and RAID5.

Hope that answers your question.
Regards,
Shahid
0
 

Author Closing Comment

by:amendala
ID: 33638122
Perfect!  This is exactly what I needed.  Thank you!
0

Featured Post

Resolve Critical IT Incidents Fast

If your data, services or processes become compromised, your organization can suffer damage in just minutes and how fast you communicate during a major IT incident is everything. Learn how to immediately identify incidents & best practices to resolve them quickly and effectively.

Question has a verified solution.

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

Why should I virtualize?  It’s a question that’s asked often enough.  My response is usually “Why SHOULDN’T you virtualize?”
After seeing many questions for JRNL_WRAP_ERROR for replication failure, I thought it would be useful to write this article.
This tutorial will walk an individual through the steps necessary to configure their installation of BackupExec 2012 to use network shared disk space. Verify that the path to the shared storage is valid and that data can be written to that location:…
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…

728 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