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System Overview 1-27
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.
!
BSU hot swap fans:
Any one of the four system fans can be replaced while the system power is on.
!
DEU hot swap fans (rack-mount only):
Any one of the hot swap fan assemblies can be replaced while the system power is
on.
!
Power redundant system:
When two power supplies are installed on a four processor system or three power
supplies on an eight processor system a failed power supply can be replaced by hot
swapping.
Hot Plug PCI
Hot Plug PCI bus slots are located under the top cover of the BSU (see Figure 1-10).
This PCI bus allows devices to be installed or removed while the server is powered on
(if the operating system supports the Hot Plug PCI function.)
Note:
Windows NT 4.0 does not support the Hot Plug PCI
function.
Fans
In addition to the power supply fans, the BSU has four CPU fans contained in two fan
boxes (two fans per box) cabled to the system baseboard. The four CPU fans (front and
rear) are hot swappable and redundant in configuration. If one fan fails, its associated
fan changes to high speed operation.
The DEU has four fans that are hot swappable in a rack-mount system.
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.