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| Changing the VVR tunables | ||
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VVR provides you with a number of tunable parameters that can be tuned to a specific value, according to your requirements. For a detailed explanation of the VVR tunables, see the Veritas Volume Replicator Planning and Tuning Guide.
The following table provides you with a quick reference to the tunables that can be modified using the vxtune utility.
All tunables can be modified using the system-specific method.
Table: VVR Tunables
The tunables can be tuned either using the vxtune utility or by using the system-specific interface. Some of the tunables can be tuned using only the system-specific method, while the others such as the memory tunables can be tuned using both the methods. The advantage of using the vxtune utility to tune the parameters is that you need not reboot the system after modifying the tunable value. This is especially useful if you want to experiment with different values to arrive at an optimum value to suit your requirements. However, the changes to the tunables using the vxtune utility are non-persistent. To make the changes persistent you still must use the system-specific method. However, you must reboot the system for the changes to take effect.
The current values for the tunables are defined in the /etc/vx/vxtunables file after you have used the vxtune utility for the first time.