Solaris Tunable Parameters Reference Manual

Example—Using mdb to Change a Value

To change the value of the integer variable maxusers from 5 to 6, do the following:

# mdb -kw
Loading modules: [ unix krtld genunix ip logindmux ptm nfs ipc lofs ]
> maxusers/D
maxusers:       495
> maxusers/W 200
maxusers:       0x1ef           =       0x200
> $q

Replace maxusers with the actual address of the item to be changed as well as the value the variable is to be set to.

See the Solaris Modular Debugger Guide for more information on using the modular debugger.

When using adb, kadb, and mdb, the module name prefix is not required because after a module is loaded, its symbols form a common name space with the core kernel symbols and any other previously loaded module symbols.

For example, ufs:ufs_WRITES would be accessed as ufs_WRITES in each of the debuggers (assuming the UFS module is loaded), but would require the ufs: prefix when set in the /etc/system file. Including the module name prefix using adb or kadb results in an undefined symbol message.