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3.2. Optimizing Virtual Machines Running On Red Hat Gluster Storage Volumes
The readahead mechanism is essential for sequential read performance on virtual machines. For virtual machines that run on Red Hat Gluster Storage, the
virtual-guest profile does not provide sufficient readahead by default. You can improve virtual machine performance by editing the virtual-guest profile to provide a more suitable readahead value.
Install the Tune daemon
Install the tuned daemon that tunes the system settings dynamically.#
yum install tunedOn the virtual machine, edit the virtual-guest profile
In the/etc/tune-profiles/virtual-guest/ktune.shfile, change the value of themultiply_disk_readaheadoption to16.Apply the modified virtual-guest profile on the virtual machines
Activate the modified profile with the command:# tuned-adm profile virtual-guest
