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Eric.Hennessey | 18 Apr 2012 | 0 comments

I've been blogging over the past couple of weeks under the theme "Everything you think you know about clustering is wrong". It's sort of a tongue-in-cheek theme, but the misconceptions I was trying to dispel are real and held by enough people that I felt they were worth addressing. But now I want to shift gears a little bit.

In my last post, I mentioned how a lot of people can't seem to break out of the late-1990s mindset of 2-node active/passive failover HA:

While large clusters meant we no longer needed two nodes for every critical application, many people's mindsets were still stuck in 1997 and they continued to view HA clustering in a 2-node, active/passive context.

To be sure, that's definitely not the case with all of our customers, especially...

Bhavin Thaker | 16 Apr 2012 | 3 comments

A big Hi to the Attendees of the SAMG Customer Forum in March 2012!

Thank you for attending my session on "Intelligent Monitoring Framework (IMF) – Smarter Availability" and rating it to be the BEST amongst all the Engineering sessions. I thoroughly enjoyed presenting this topic to you and it seems from the various feedback comments that you enjoyed my session too.

Attached is a PDF copy of my presentation for your perusal and given below is the link to the Easy IMF Plugin to make a VCS customer agent IMF enabled, that I described during the talk:

            https://www-secure.symantec.com/connect/blogs/easy-imf-plugin-make-vcs-agent-imf-enabled

I hope this session helped you understand both the black-box workings of the...

anishv | 16 Apr 2012 | 0 comments

Thank you all for attending the session on "Maximizing Availability in Virtualized Environments" during the SAMG Customer Forum in March 2012. I hope you would have found it useful.

We discuseed the following content during the session.

"Implementation architectures of VCS and ApplicationHA for virtualized environments. We reviewed common use cases and discussed how others are achieving maximum application availability in their virtualization implementations. This session provided information for VMWARE, Solaris Zones/LDOMs, AIX LPARs/WPARs and Linux KVM environments"

Again, thank you for your participation and hope to see you soon!

Regards,

Anish Vaidya

Eric.Hennessey | 13 Apr 2012 | 4 comments

 

A couple days ago, I blogged about the related myths of complexity and unreliability regarding high availability (HA) clustering. Today I want to spend a little time on the myth that clustering is expensive.
 
Early high availability clustering was as simple as it was primitive. Shared  storage was generally limited to two nodes via dual-attached SCSI disks and  communication between nodes typically consisted of each node just pinging the other periodically to check its state. If the standby node decided the active node was dead, it would respond to that failure by firing local copies of the  failed node's startup scripts to restart applications that had been running there.
 
But SAN and NAS technologies which allowed many more nodes to share...
Eric.Hennessey | 10 Apr 2012 | 1 comment

 

In my last post I mentioned a few common misconceptions about HA clustering that I'd be debunking; namely that it's unreliable, complex, and expensive. There are others that we'll get to in later posts, but for this one I want to tackle the myths of unreliability and complexity, since they kind of go hand-in-hand.
 
The vast majority of our customers using Veritas Cluster Server (VCS) for high availability have been using it for quite some time and are completely happy with it. But we do hear from time to time from customers who say they've used HA clustering in the past - either VCS or Brand X - and stopped using it because it "broke". Frankly, this reaction baffles me. As an IT guy who's been in the business for - well, let's just say a long time, OK? - I learned early on that if something...
Zahid.Haseeb | 09 Apr 2012 | 0 comments

Environment

 

SFHA = 5.1 SP2 (64bit)

OS = WIn2008R2

Problem

 

When opening the VEA the Error V-39-49408-1 will be faced.

Solution

 

There may be some other problem but this may be the solution through which I resolved the issue. Active Directory Services/Domain Controller was not up when the cluster node started. I just started the Domain Controller. See the error below for reference:

 

Eric.Hennessey | 05 Apr 2012 | 0 comments

We're making some pretty big changes in how we deliver high availability and disaster recovery, and to do that, we have to change how we look at HA & DR. But in order to do that, we first need to debunk a few myths about clustering that seem to have crept into a lot of people's heads over the years.

 

This is the first in a series of posts I'll be putting up here at Symantec Connect over the coming week or so in which I'll lay out some common misconceptions of HA clustering and explain why they're wrong. Here's an example of what some people believe about clustering and which I'll refute over the coming days:
  • Clustering is unreliable
  • Clustering is too complex
  • Clustering is expensive
Sure, like any other myth these have their origins in someone's actual experience, but just like the mythology...
Bhavin Thaker | 15 Mar 2012 | 0 comments

Easy IMF plugin to make a VCS agent IMF-enabled
================================================

1) Stop the VCS cluster
   # hastop -all

Note: The steps here are meant for education purposes only and
hence shutdown VCS. You can perform these steps by keeping
VCS online as well. Refer to the VCS Admin guide and
Agent Developer's guide for further details.

2) Let's write a quick VCS agent that starts the script myimf.sh
 
   # mkdir /opt/VRTSvcs/bin/ezimf
   # cd /opt/VRTSvcs/bin/ezimf

   # vi myimf.sh   (enter the following text)
---------------------------------------------------------------------------
#!/bin/sh

while [ 1 ]
do
        sleep 60
        /usr/bin/logger -p kern.alert "hello world from myimf.sh"...

Theresa LaVeck | 13 Mar 2012 | 0 comments

Discover the power of the Storage and Availability Track at Symantec Vision 2012. It’s a unique opportunity for storage and server IT professionals to spend time with other users, and spend time with our top technical experts through one-on-one meetings, technical sessions, product deep dives and hands-on labs covering relevant topics like:

  • Multi-tier application recovery
  • Disaster Recovery automation
  • Deduplication and compression for primary storage
  • How your peers are using Storage Foundation High Availability 6.0

In addition, you’ll have the opportunity to meet with our product managers and engineers to learn more about and influence the future direction of our storage and availability offerings. Don't forget to take advantage of the Early Bird discount by March 30, 2012.

Satish K. Pagare | 09 Mar 2012 | 0 comments

VCS 5.1SP1 onwards supports intelligent resource monitoring in addition to poll-based
monitoring. Intelligent Monitoring Framework (IMF) is an extension to the VCS
agent framework. You can enable or disable the intelligent monitoring functionality
of VCS agents as needed.

The benefits of intelligent monitoring over poll-based monitoring are as follows:

  • Faster notification of resource state changes.
  • Reduction in VCS system utilization which enables VCS to effectively monitor a large number of resources.

Below is the list of VCS agents that support IMF.

Agent Supported VCS
versions/Platforms
Comment
Oracle

VCS 5.1SP1

Solaris, AIX, Linux, HPUX

IMF Support for all subsequent releases.
Sybase VCS 6.0
Solaris, AIX, Linux, HPUX...