Starting with the Oracle Solaris 11 OS, do not make manual changes to the /etc/system file. This file is automatically generated upon reboot when files in the /etc/system.d directory specify tuning property values.
For example, to specify a value for the vds:vd_volume_force_slice property, determine whether the property is already set.
# grep 'vds:vd_volume_force_slice' /etc/system /etc/system.d/*
/etc/system.d/com.company-name:ldoms-config