VxVM is optimally tuned for most configurations ranging from small systems to larger servers. In cases where tuning can be used to increase performance on larger systems at the expense of a valuable resource (such as memory), VxVM is generally tuned to run on the smallest supported configuration. Any tuning changes must be performed with care, as they may adversely affect overall system performance or may even leave VxVM unusable.
Various mechanisms exist for tuning VxVM. Many parameters can be tuned by editing the file
/kernel/drv/vxio.conf to override the default values set by the
vxio driver. Other values can only be tuned using the command line interface to VxVM.
See "Changing the values of tunables" on page 475.