What you will learn from this tip: How to use clustering to share disk resources between two nodes for DR.

 


A SearchStorage.com reader recently asked: I want to disconnect a LUN from one Windows server and connect it to another Windows server in case of disaster. Is it possible to connect to it without Windows writing a new signature and losing all my data?

The best way to do this with the most success and easiest

    Requires Free Membership to View

failover is to use a cluster to share the disk resources between two nodes. You can use any available clustering technology you wish such as Microsoft Cluster Server (MSCS) or Veritas VCS. MSCS is included with the Enterprise and Data Center editions of Windows. Dynamic disks should not be used in a cluster.

I have had intermittent success without the cluster software installed, but you might try this technique: Make sure both servers are similar in their slot layout for the HBAs, and use BASIC disks when writing the disk signature on the first server. Never have both servers up at the same time when not in a cluster, or your data may become corrupt. Once the signature is written, export the DISK registry subkey parameters for the new disk, and import the subkey parameters into the other server. Back everything up before doing this, and make a backup of the registry keys on the server you are importing to in case anything goes wrong. You may not have to do the registry trick if the second server sees the disk and does not try to write a new signature.

A better approach would be to use SAN-based booting for the servers in question. Having your "C:" drive on the SAN allows a server of the same configuration to boot to the failed server's SAN-based root drive, and the new server would then acquire the exact same profile as the server that was lost. I call this technique "poor man's clustering." You need to have similar server hardware configurations for this to work properly.

For more information:

Clustering comes to NAS

Checklist: How to design LUNs for high performance

Checklist: How to troubleshoot your LUN

Four experts in four minutes: Creating LUNs

 


About the author: Christopher Poelker is a storage architect at Hitachi Data Systems, and SearchStorage.com's storage networking expert.

This was first published in June 2008

There are Comments. Add yours.

 
TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

Disclaimer: Our Tips Exchange is a forum for you to share technical advice and expertise with your peers and to learn from other enterprise IT professionals. TechTarget provides the infrastructure to facilitate this sharing of information. However, we cannot guarantee the accuracy or validity of the material submitted. You agree that your use of the Ask The Expert services and your reliance on any questions, answers, information or other materials received through this Web site is at your own risk.