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Undocumented VCB config.js feature

Duncan Epping · Feb 6, 2008 ·

One of my customers wanted to use the default VCB framework but did not want to quiesce the VM for several reasons. (Databases, Active Directory etc.) I could not find an option in the config.js file but noticed the following in the file glue.js:

// A fallback to be able to switch to non-quiesced snapshots
if (typeof(NO_QUIESCE) != "undefined") {
cmd +="-Q 0 ";
}

In other words, setting the option “NO_QUIESCE” with no value in config.js results in the VM not being quiesced, default it will quiesce the VM! I added the following line to the  config.js file to accomplish this:

NO_QUIESCE="";

Related

BC-DR ESX, snapshots, VCB, VMware

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Comments

  1. Wade Holmes says

    6 February, 2008 at 19:47

    I have accomplished this also in the past by showing the hidden devices within the VM, and disabling the Legato sync driver.

  2. Duncan Epping says

    6 February, 2008 at 20:31

    That’s also an option indeed… you can also chose not to install the sync driver.

  3. Scott Lowe says

    8 February, 2008 at 19:48

    Good find, Duncan!

  4. Morgan Storey says

    9 April, 2009 at 06:23

    You can also pass vcbmounter the “-Q 0” options to no quiesce the vm.

  5. Duncan says

    9 April, 2009 at 07:43

    Yes, but they wanted to use the scripts instead of the vcbmounter directly…

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About the Author

Duncan Epping is a Chief Technologist and Distinguished Engineering Architect at Broadcom. Besides writing on Yellow-Bricks, Duncan is the co-author of the vSAN Deep Dive and the vSphere Clustering Deep Dive book series. Duncan is also the host of the Unexplored Territory Podcast.

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