NEC EXPRESS5800/120Lf, User Manual

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System Overview 1-17
System Functions
The following subsections describe select system functions.
Hot Swapping
Hot swapping allows a device to be replaced, such as a hard disk drive while its power
is on, as listed below.
!
Disk array system:
Any failed hard disk drive can be replaced while the system is running.
!
Redundant power system:
When two power supply units are installed on the redundant power system a
failed power supply can be replaced by hot swapping.
Sleep Mode
The SLEEP mode switch on the front of the server is used for saving power.
If the SLEEP mode switch is pressed, then the server enters into the sleep state (the
Drive Bay Power lamp and the Power lamp will blink simultaneously). In the power
saving mode, the memory data and the states of the jobs are kept unchanged. In
addition, the server in the power saving mode can accept accesses to hard disks from
other machines on the network and perform other network jobs.
Sleep mode requires an operating system that supports its function.
Note: Windows NT 4.0 does not support the Sleep mode
function.
ACPI
An Advanced Configuration and Power Interface (ACPI) aware operating system can
place the system into a state where the hard drives spin down, the system fans stop, and
all processing is halted. However, in this state the power supply is still on and the
processors are still dissipating some power such that the power supply fan and
processor fans are still running.
Note: ACPI requires an operating system that supports its
feature.
!
CAUTION
Only when the AC power is disconnected is the system completely
off.