vSphere Availability

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  • 1.  ApplicationHA and Faulth Tolerance together?

    Posted Nov 22, 2012 01:36 PM

    Hi,

    please does Symantec ApplicationHA and Faulth Tolerance work together?



  • 2.  RE: ApplicationHA and Faulth Tolerance together?

    Posted Nov 22, 2012 04:40 PM

    No, both are 2 completely different approaches at providing availability and have no integration, which doesn't really make any sense in the first place:

    If you expect FT to be able to somehow, magically help with anything going on inside the VM, then you're on the wrong track.

    Fault Tolerance, won't be of use if the application crashes or has some other problem. Like everything else, this problem will be "replicated" to the shadow VM too.

    Application HA sounds cool at first, but I don't see the point in making vSphere HA responsible for anything on the application layer, and I have yet to see any reasonable implementation of it. What can the  virtualization side provide that any simple monitoring/response/scripted solution you already have in place in physical systems since years cannot? Trigger a hard reset of the VM from within the guest? Seriously? If your application is so far down the drain that you need to resort to this, then you should seriously consider a replacement.

    What can make sense however, is using the VM Monitorng feature of HA to protect against complete guest OS failures (bluescreen, kernel panic etc.).



  • 3.  RE: ApplicationHA and Faulth Tolerance together?

    Posted Nov 22, 2012 04:58 PM

    The question is about Symantec ApplicationHA and not vSphere HA... Correct?

    // Linjo



  • 4.  RE: ApplicationHA and Faulth Tolerance together?

    Posted Nov 22, 2012 05:21 PM

    I understood the question as being about the vSphere Application HA feature, which is in fact being leveraged by Symantec ApplicationHA:

    http://www.yellow-bricks.com/2010/11/03/how-does-symantec-applicationha-integratework-with-vmware-ha/

    http://www.yellow-bricks.com/2011/08/11/vsphere-5-0-ha-application-monitoring-intro/



  • 5.  RE: ApplicationHA and Faulth Tolerance together?

    Posted Nov 23, 2012 08:17 AM

    Frantisek Ferencik wrote:

    Hi,

    please does Symantec ApplicationHA and Faulth Tolerance work together?

    Not sure how it could as FT just mirrors the state of a VM. Meaning that if the app fails, the failure is mirrored and on both sides AppHA would have to respond the same way.



  • 6.  RE: ApplicationHA and Faulth Tolerance together?

    Posted Nov 23, 2012 08:33 AM

    Ok,

    but it would be nice to offer solution ApplicationHA plus FT.



  • 7.  RE: ApplicationHA and Faulth Tolerance together?

    Posted Nov 26, 2012 06:45 AM

    Frantisek Ferencik wrote:

    Ok,

    but it would be nice to offer solution ApplicationHA plus FT.

    How do you mean that? Can you explain exactly what you are looking for?