tailieunhanh - Networking: A Beginner’s Guide Fifth Edition- P42

Networking: A Beginner’s Guide Fifth Edition- P42:I have run into many people over the years who have gained good even impressive working knowledge of PCs, operating systems, applications, and common problems and solutions. Many of these people are wizards with desktop computers. | Chapter 13 Network Servers Everything You Wanted to Know but Were Afraid to Ask 187 In-case temperature Operating system hangs Computer case opening Any of these errors might indicate a current or impending problem with the server. For example a 1-bit memory error that is corrected by the system s ECC memory might not cause a problem for the server because it was corrected but it might indicate that a RAM chip or bank of RAM is starting to experience trouble. Similarly climbing temperatures in a case might not cause an immediate problem but may indicate that a fan isn t operating properly has a blocked intake or is facing another problem and ultimately temperatures higher than those allowed for in the server design will cause a failure. Server state monitoring solutions can alert you to problems either via e-mail or through a pager. Some even operate if power is lost to the server or the server room this is called lights-out capability . Many high-end servers also offer prefailure warranties that state that the manufacturer will replace any components reporting even minor errors so you can replace them before serious trouble actually strikes. For those servers you depend on to be the most reliable possible such monitoring and warranty features can be a real lifesaver. Hot-Swap Components Most modern servers include hot-swap components that you can replace while the system continues to operate. Usually hot-swap components are limited to disks power supplies and fans all of which are running in a redundant configuration. For example a system might have two power supplies if one fails the system still operates normally and you can replace the failed power supply without needing to turn off the server. Similarly most RAID disk configurations enable you to replace a failed drive without shutting down the server provided the disks are installed in a hot-swap configuration. g TIP Many RAID disk systems enable you to install a standby disk and the system itself uses that .

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