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2.2. Optimizing Virtual Machines On Red Hat 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 daemonInstall the tuned daemon that tunes the system settings dynamically.
#
yum install tuned - Edit the virtual-guest profile provided by the Tune daemon.Edit the
/etc/tune-profiles/virtual-guest/ktune.shIdentify the linemultiply_disk_readahead 4and replace it withmultiply_disk_readahead 16 - Apply the virtual-guest profile on the virtual machinesActivate the updated profile with the command:
#
tuned-adm profile virtual-guest
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