Friday Jul 11, 2014

What Can You Do With Data Link Multipathing (DLMP)?

When I first learned about high availability, it was something you provided by creating one or more copies of the operating environment on separate servers. Sometimes on different continents. If the server in Canada failed, the server in Ireland would take over.

Then I found out about Real Application Clusters. Wait, I asked myself, weren't applications invented for the sole purpose of field-testing the OS? Why do test programs need high availability? Haven't these people heard of Oracle Solaris Cluster?

Well, to my great disappointment there are plenty of different approaches to high availability. Just like there are plenty of different approaches to virtualization. And, as you might imagine, you can combine the two.

For instance, if you're going to build a cloud infrastructure using the virtualization capabilities in Oracle Solaris 11, you might as well allocate your network resources to the virtualized environment, as well. And so, you'd probably find yourself creating virtual switches, routers, cards, and what not. Well, what happens if all those virtual networks, which are really just one physical network, go down?

Bjoern Rost, Oracle ACE, provides a nice explanation of a Solaris feature that didn't get a lot of attention when it was released: Data Link Multipathing (DLMP) and DLMP aggregation. DLMP aggregation allows you to combine virtual network interfaces from different physical network interfaces into high availability clusters. You can also use these clusters to improve load balancing, as Bjoern explains in his blog post.

Orgad likes DLMP, too. So much, in fact, that he took a break from reconfiguring the International Space Station so his kids could control it from their XBox, and wrote an article explaining how to apply DLMP to a virtual network. Two articles, in fact.

Tech Article: Using DLMP to Add High Availability to Your Network in Oracle Solaris 11.1

by Orgad Kimchi

How to combine virtual NICs from different physical NICS into a DLMP aggregation assigned to a zone, and configure the aggregation to provide failover for the zone, using Oracle Solaris 11.

Tech Article: Doing More with DLMP

by Orgad Kimchi

You can give an Oracle Solaris 11 zone exclusive access to a physical NIC. Although that approach can ensure that particular zone has full access the entire bandwidth of the NIC, it does leave NIC and the entire network exposed to security breaches. Unless you use DLMP's Link Protection capability. Orgad explains how to do that, as well as enabling resource management for your Oracle Solaris 11 virtual network, improving the availability of an NFS server, and more.

About the Photograph

Lou Ordorica and I took off early a few weeks ago to get in some twisties before the crowds showed up. We stopped at The Last Shot on the Peak to Peak highway to grab a late breakfast/early lunch. While we were there a few more bikes showed up.

- Rick
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Tuesday Apr 23, 2013

The Sysadmin as CEO

Bjoern Rost began his professional life as a sysadmin, and no doubt through the clever use of scripts became the CEO of his own consulting company (image removed from blog). Oracle recently announced his appointment to Oracle ACE Director. Here's some background information about Bjoern and his company, a video interview, and links to his most recent blog posts.

About Bjoern Rost, Oracle ACE Director

Bjoern is the co-founder of Portrix Systems, a service provider and consulting company focused on Oracle technologies including servers, storage, Solaris, Real Application Cluster databases, and desktop virtualization. He enjoys working with software developers to tightly integrate with existing Oracle features, is passionate about sharing knowledge, and has enjoyed speaking at several conferences and user group meetings including OpenWorld, UKOUG, COLLABORATE and DOAG. He also serves as the European Chair of IOUG's RAC special interest group.

Interview with Bjoern at Oracle Open World 2012

Before I knew that Bjoern was even being considered for Oracle ACE Director, I had the good fortune of chatting with him at Oracle Open World 2012. He's an excerpt from our conversation:

A Sysadmin CEO's Favorite Technologies in Oracle Solaris 11
Bjoern Rost, Orace ACE Director, was a sysadmin before he co-founded a consulting company, Portrix Systems. He describes how that happened, which Oracle technologies he used, what he used them for, and what his favorite parts of Oracle Solaris 11 are. Bonus: how engineered systems are leading to a confluence of the system admin and the database admin.

Bjoern's Blog

Bjoern's Blog is actually a team blog with contributions from three Euro-techies named Florian, Markus, and Ole. Recent topics are:

About Portrix Systems

Portrix Systems, an Oracle Gold Partner, is a full service provider helping customers run and operate complex IT systems by integrating infrastructure and services. From their home page:

"We started as the internal system administration division of the PORTRIX group. Duties involved setting up test and development systems for software developers and consulting about their optimal use. This soon evolved into services we provided for our customers who leveraged the potential to receive ISV software products bundled with integration and operation services by the same people who were already involved in development.

Congratulations, Bjoern! We're very glad to have you with us.

- Rick

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