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Language:
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Red Hat Training
A Red Hat training course is available for Red Hat Gluster Storage
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.
Install the Tune daemon
Install the tuned daemon that tunes the system settings dynamically.#
yum install tuned
Edit the virtual-guest profile
Edit the/etc/tune-profiles/virtual-guest/ktune.sh
file.Identify the linemultiply_disk_readahead 4
and replace it withmultiply_disk_readahead 16
Apply the virtual-guest profile on the virtual machines
Activate the updated profile with the command:#
tuned-adm profile virtual-guest