Dell PowerVault NX3000 Hardware Owner's Manual page 172

Jumper
PWRD_EN
NVRAM_CLR
172
Jumpers and Connectors
Setting
Pins 2 and 4
(default)
Pins 4 and 6 The password feature is disabled and
Pins 3 and 5
(default)
Pins 1 and 3 The configuration settings are cleared at
Description
The password feature is enabled.
iDRAC6 local access is unlocked at the next
AC power cycle.
The configuration settings are retained at
system boot.
the next system boot. If the configuration
settings become corrupted to the point
where the system will not boot, install the
jumper and boot the system. Remove the
jumper before restoring the configuration
information.