tailieunhanh - Red Hat Linux Networking and System Administration Third Edition phần 10

trình soạn thảo để thay đổi kích thước hoặc thao tác bảng parition. Các công cụ mình thường làm việc tốt và không thể hiện bất kỳ bất ngờC AU tion chăm sóc Tập thể dục khắc nghiệt khi sử dụng chia tay hoặc bất kỳ phân vùng khác | Troubleshooting and Problem Solving 891 Cannot Mount a Partition If you are unable to mount one or more partitions after an upgrade the problem could be due to the use of partition labels. Red Hat Linux uses partition labels to help prevent problems that occur when moving hard drives around in a system. For example if is on dev sdb and a new drive is added to the system with a lower SCSI ID the drive that was previously dev sdb becomes dev sdc. This change causes the mount command to generate errors when it tries mount . Partition labels address this problem because mount tries to mount the partition identified by its labels as instead of trying to mount dev sdbl and expecting it to be . The idea is great in theory as long as you keep partition labels less than 16 characters. Avoiding File System Checks at Each System Reboot If you constantly have to run fsck each time you boot your system the most likely suspect is that your partitions are not being unmounted properly when you last shut down the machine. The most important thing you can do is make sure that you are shutting down the machine properly. Shutdown is done through one of two methods If you are in text mode run level 3 you should log in as root and type the following command sync sync sync shutdown -r now If you are using the graphical login run level 5 click Actions o Log Out o Shutdown. Eventually you see a line that reads Power Down indicating it is safe to turn off the machine. In either case if you are running APM or ACPI Linux tries to stop the machine using the BIOS. Solving Networking Problems There are many possible causes of problems with your network and troubleshooting them can be a tough task. But if you follow a systematic procedure as explained earlier in this chapter you can get through it and solve your problem. Some general guidelines to follow for troubleshooting network problems are presented here 1. Don t overlook the simple things. For example if a user calls complaining that he .