Dell PowerVault 715N Podręcznik użytkownika - Strona 8
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network. See your System Administrator's Guide for information about this type of reinstallation.
System Diagnostics — runs the System Diagnostics program. See your Installation and Troubleshooting Guide for
information about system diagnostics.
Update BIOS Flash ROM — updates the BIOS on your system. See
Information" for information about updating the BIOS.
Enter BIOS Setup Utility — starts the BIOS Setup utility, which enables you to change system settings. See
"BIOS Setup
Options" for information about using the BIOS Setup utility.
Exit — exits the Function Select menu and resumes the normal boot process.
Power Protection Devices
Devices are available that protect against power problems such as power surges, transients, and power failures. The
following subsections describe some of the devices.
Surge Protectors
Surge protectors are available in a variety of types and usually provide a level of protection commensurate with the cost
of the device. Surge protectors prevent voltage spikes, such as those caused during an electrical storm, from entering a
system through the electrical outlet. Surge protectors, however, do not offer protection against brownouts, which occur
when the voltage drops more than 20 percent below the normal AC line voltage level.
Line Conditioners
Line conditioners go beyond the overvoltage protection of surge protectors. Line conditioners keep a system's AC power
source voltage at a fairly constant level and, therefore, can handle brownouts. Because of this added protection, line
conditioners cost more than surge protectors—up to several hundred dollars. However, the devices cannot protect against
a complete loss of power.
Uninterruptible Power Supplies
UPS systems offer the most complete protection against variations in power because they use battery power to keep the
system running when AC power is lost. The battery is charged by the AC power while it is available, so once AC power is
lost, the battery can provide power to the system for a limited amount of time—from 15 minutes to an hour or so—
depending on the UPS system.
UPS systems range in price from a few hundred dollars to several thousand dollars, with the more expensive units
allowing you to run larger systems for a longer period of time when AC power is lost. UPS systems that provide only 5
minutes of battery power allow you to conduct an orderly shutdown of the system, but they are not intended to provide
continued operation. Surge protectors should be used with all UPS systems, and the UPS system should be Underwriters
Laboratories (UL) safety-approved.
Other Documents You Might Need
In addition to this User's Guide, the following documentation is included with your system:
The system Installation and Troubleshooting Guide provides information about installing and troubleshooting your
system.
The System Administrator's Guide provides system operation and management information.
Dell PowerVault NAS Manager online help.
The System Information document provides important safety, regulatory, and warranty information.
The Rack Installation Guide provides information for installing the system in a rack.
Microsoft Windows Powered help.
"Updating the
BIOS" in
"Features and Other