Thursday Jun 25, 2009

High Availability and Virtualization at FISL 10

I am going to give a talk on High Availability and Virtualization technologies on OpenSolaris at FISL. Come and attend my talk on the 26th of June at 12:00 noon at the 41A auditorium at FISL. More information at

Wednesday Jun 17, 2009

High Availability: Today and Tomorrow

The First Open HA Cluster summit was held in 31st May 2009 in San Francisco. Here is a video of the panel discussion titled "High Availability: Today and Tomorrow".

All slides can be found at

Friday Jun 12, 2009

Open HA Cluster 2009.06

Open High Availability Cluster 2009.06 got released. It is a supported release on OpenSolaris 2009.06. It runs on Intel/AMD hardware (x86) and on SPARC systems. My contribution to the project was to bring up Cluster on SPARC platform. Here is  a video on this new version of Solaris Cluster.

Thursday May 28, 2009

Getting Started with Open HA Clusters @ the OHAC summit

OHAC Summit

I have not blogged for a long time, had been real busy. One of the things keeping me busy was the Open HA Cluster Summit to be held on the 31st of May in San Francisco. I will be delivering a talk on Open HA Cluster community and how to participate in it. See you all at the summit. You will find my slides here after the talk. 

Please register for the Summit at

Friday Apr 10, 2009

Invitation to Students to attend Open HA Cluster Summit '09

Make High Availability Work For You

TO:  University students and Advanced High School students

You are invited to participate in the first OpenSolaris Summit for Open HA Cluster.

Open HA Cluster Summit
Sunday, May 31st, 2009
San Francisco Marriott (Next to Moscone Convention Center)
55 Fourth Street
San Francisco, CA 94103 USA

Join us as we explore the latest trends of High Availability Cluster technologies, as well as key insights from HA Clusters community members, technologists, and users of High Availability and Business Continuity software.  Learn how to increase the availability of your favorite applications from blogs to enterprise level infrastructure.  You will have the unique opportunity to hear one of the featured guest speakers, Dr. David Cheriton, industry expert and professor at Stanford University.

It will be a full day of speakers, panel discussions, technical tracks, food and prizes.  The first 10 students to arrive at the conference, bright and early at 8:45 a.m., will be able to participate in a drawing for a nano-iPod.  Later at the evening reception we will be giving away a Toshiba Portege laptop.  The event is free.


Dr. David Cheriton is professor of computer science at Stanford University.  He heads the Distributed Systems Group, which is the research group in the Departments of Computer Science and Electrical Engineering at Stanford University.  He co-founded Granite Systems and Kealia with Andy Bechtolsheim (Sun co-founder). He was instrumental in helping Stanford students Sergey Brin and Larry Page fund Google.  In his "spare time", Dr. Cheriton is Chief Scientist at Arista Networks and serves on the board of Aster Data Systems.

\*Eligibility for drawings:
You must be registered to win, have a valid, current student ID card, 18 years or older, and a U.S. citizen or legal resident.  Other terms and conditions apply.

Save the Date and Register for the Summit today!

Questions about the event or registration?

Send Email to:

Community Members and Non Students refer to

Wednesday Jan 28, 2009

Solaris Cluster 3.2U2

Solaris Cluster 3.2U2 got released yesterday. This release contains the zone cluster feature. Thus one can make clusters made up of zones. Now isn't it really cool. Well I find it even cooler since I have been working on zone cluster project :)

Top New and Enhanced Features

1. Virtualization

Solaris Cluster includes extended Solaris Container support for applications such as Oracle RAC databases enabling highly available consolidated services at lower cost.

  • Solaris Container Cluster: Allows the creation of fully isolated virtual clusters based on Solaris Container virtual nodes. Distributed applications such as Oracle RAC databases and in the near future solutions such as MySQL can be run in separate virtual clusters. Multiple databases or database version can be consolidated into one physical cluster for highly available consolidated service.
2. High Availability

Solaris Cluster is enabling increased High Availability levels through more monitoring capabilities and improved configuration verification tools.

  • Quorum Monitoring: Provides continuous monitoring of all types of quorum devices including quorum server and sends notifications about failures, enabling proactive maintenance.
  • Configuration Checker: Checks for vulnerable cluster configurations regularly and rapidly, limiting failures due to mis-configuration throughout the life-time of the cluster
3. Flexibility and Ease of Use

Solaris Cluster is improving flexibility and ease of use and support more configurations.

  • Optional Fencing: Fine-grained control of the usage of fencing enables use of shared storage by systems outside the cluster and inclusion of new storage with limited or no support of SCSI based fencing.
  • Software Quorum: Disks that do not support SCSI reservation can be used as quorum disks thanks to a new quorum device protocol.
  • Optional dedicated partition: a lofi device can be used on Solaris 10 for the Solaris Cluster global-devices namespace as an alternative to a dedicated partition.
  • Exclusive IP in Solaris Container: supported with Solaris Cluster HA agents.
  • Oracle Data Guard: supported with Solaris Cluster Geographic Edition.
  • IPsec: supported on the cluster interconnect.
  • Sun StorageTek Availability Suite: supported in Solaris Container with Solaris Cluster Geographic Edition.
4. New supported applications and agent features

Solaris Cluster is supporting even more applications such as Informix IDS and applications versions out-of-the-box to facilitate integration and deployment.'

Read and view more about the  announcement here

Tuesday Jan 27, 2009

Solaris Cluster for High Availability and Disaster Recovery

Sunday Jan 25, 2009

Second Bug Fix to OHAC

Lalith On 16th Jan 2009, the second OHAC bug fix, contributed by Lalith Suresh, student and Sun Campus Ambassador from Malaviya National Institute of Technology, Jaipur,  went into the OHAC gate. I was the sponsor for this bug.

I first met Lalith in the CA induction program in Bangalore and later on came to know that he was very interested in OHAC. As a part of the induction program he had given a talk on clustering and he is also working on HA-Cron and HA-Zabbix agents for OHAC.

Sponsor Request for CR 4616225

Code Review for CR  4616225 

Read about the first OHAC Bug Fix here.

Thursday Sep 04, 2008

Thursday Aug 21, 2008

Bug Fix Code Review in OPEN

I did my first code review in the OPEN. You can read its here. Hopefully, more and more cluster engineers will take this path.

Friday Aug 01, 2008

OHAC group in sunambassadors

A few days back, I got invited to join the Sun Campus Ambassadors social networking site. The entry is by invitation only and restricted to Sun CA's and employees (mostly involved with the University Program or the CA program).

After signing up, I created a group for OHAC and am happily surprised to see 10 people joining the group and its not 24 hours yet. Hopefully more CA's will sign up and learn about clustering and high availability and work on OHAC projects.

The OHAC group is at

Saturday Jun 28, 2008

OHAC enters the University

After about a year of evangelizing OHAC, finally a student has actually installed Cluster Express, the binary distribution of Open HA Cluster (OHAC). Abhilash, a student from Amrita Vishwa Vidyapeetham, Amritapuri campus is one of the first students in India to install Cluster Express. Probably he is the first one from the student community to do so. All students who have started using OHAC, feel free to comment on this blog about your experiences with Cluster Express.

Hear from Abhilash in his own words. 


I am a Computer Science and Engineering student at Amrita Vishwa Vidyapeetham, Amritapuri campus. I was first introduced into the exciting world of Open Source by participating in the Sun Code for Freedom Contest. I very well liked the idea and started learning more. It was a very empowering experience.

At the end of the contest I got introduced to High Availability clusters. I took it up. My first step was installing OpenSolaris on my Sony VAIO VGN-CR35G laptop. Initially I did not get the GUI. I posted my queries in BOSUG and I got excellent support. In the process I learned a lot. Then I installed the cluster. I had an older version of the cluster clusterexpress20080213-x86 which I had installed in Solaris snv_76. I found that my system was panicking after configuring a single node cluster. I posted this in the ha-cluster discuss forum. I learned what all to do in case of a panic. I learned how to take the stack trace in case of a panic. I also learned how to configure the dump device, how to boot into kernel debugger mode. I also got to learn what all to do in case we cannot boot into the OS. It is then that I found that the problem was with the version of the cluster that I was using. I immediately downloaded clusterexpress20080522-x86, installed and configured it and I found that I had successfully installed the cluster. In this process I got very good support from the cluster discuss forum especially from Tirthankar sir and Binu sir who were very generous in helping me out.

It really interests me when I get to learn new stuff. I like to organize technical events; I love to conduct technical sessions. I love to work with groups of like minded people. It really brings out the best in me. I am a CBSE national level hockey player and have participated in many Zonal and National level competitions.

Hope you have a great time hacking OHAC.

Read about Abhilash's experience here.

Sunday Jun 22, 2008

OHAC talk to CAs

Last Friday I along with Swathi gave a presentation on OHAC to Sun CA's. Around 10 (out of 13) turned up for the talk. Most of them were getting exposed to a distributed system for the first time. I faced tons of questions and the 1 hour talk lasted for 3 hours. Well this was not the end. Abhishek and  Shampavman showed up after office hours and we again talked about clusters for about 1 to 2 hours. Some of them showed interest to do projects for OHAC. Angad suggested developing a new GUI for OHAC. Abhishek wanted to write an agent for Pentaho.

I hope their enthusiasm about OHAC and distributed systems last and they develop some cool features for OHAC.

Tuesday Jun 10, 2008

Team Lunch at Cafe Masala

After a long time, we (the Solaris Cluster foundation team in India) went for a team lunch at Cafe Masala. Our last outing had been in February, which I had missed as I was attending a friends marriage. 

We took the buffet at Cafe Masala. There were 50+ items in the buffet spread a delight for both vegetarians and non vegetarians. If you have the sweet tooth, there is one section dedicated to different types of deserts.

Make reservations before you go.

Lunch: 12 pm – 3.30 pm.
Hi-tea: 3.30 pm onwards.
Dinner: 7 pm onwards.

Eva Mall, BJN Floor, Level 5,
No 60, Brigade Road,

Phone: +91 080 4111 8433




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