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3.2. Optimizing Virtual Machines On Red Hat Gluster Storage Volumes

The readahead mechanism is essential for guest sequential read performance on virtual machines. The virtual machine-tuned profile provides insufficient readahead. You can optimize the virtual machine performance by changing the multiply_disk_readahead 4 to multiply_disk_readahead 16. If you are running a Red Hat Enterprise Linux host, run the following commands to enable read-ahead.

  1. Install the Tune daemon

    Install the tuned daemon that tunes the system settings dynamically. 
    # yum install tuned
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  2. Edit the virtual-guest profile

    Edit the /etc/tune-profiles/virtual-guest/ktune.sh file.
    Identify the line multiply_disk_readahead 4 and replace it with multiply_disk_readahead 16

  3. Apply the virtual-guest profile on the virtual machines

    Activate the updated profile with the command: 
    # tuned-adm profile virtual-guest
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