FT, pay attention to heavy reads…


If you are protecting a VM which has an intensive disk-read workload, for example an OLAP database, it might be goodit is highly recommended to make the secondary virtual machine (the stand by copy VM) issue disk reads directly to the shared disk instead of getting that data over the network.  This can be done as follows:

  1. Power off the virtual machine.
  2. From the ESX command line:
    1. Run this command to find the virtual machine configuration file ( .vmx):vmware-cmd -l

      Note: This command outputs the full path of the .vmx file.

    2. Open the vmx file for editing (using nano or vi, for example).
    3. Add the following line to the file:replay.logReadData = checksum
    4. Save your changes and close the file.
  3. Power on the virtual machine.

VMware recommends to keep the default setting, that is using the network to transport the FT loggings but I would prefer save my network bandwidth for vMotion for instance and have my storage handle the reads directly…

Source: VMware.com

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About PiroNet

Didier Pironet is an independent blogger and freelancer with +15 years of IT industry experience. Didier is also a former VMware inc. employee where he specialised in Datacenter and Cloud Infrastructure products as well as Infrastructure, Operations and IT Business Management products. Didier is passionate about technologies and he is found to be a creative and a visionary thinker, expressing with passion and excitement, hopefully inspiring and enrolling people to innovation and change.
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