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Linux System Administration phần 6

được mô tả trong phần tiếp theo. Nhiều hệ điều hành MacOS X hệ thống tiếp tục sử dụng HFS +, mặc dù. Nếu bạn cần trao đổi các phương tiện truyền thông di động giữa các hệ thống Macintosh và Linux, bạn có thể làm như vậy. HFS là sự lựa chọn tốt nhất cho một hệ thống tập tin, và nếu bạn sử dụng một đĩa mềm | Buy reasonably good quality media. You don t have to buy the best but definitely buy a tape that is going to stand up to the recurring use. Name-brand tapes are more likely to survive repeated uses than are generic or minor-brand tapes. This applies to CD-Rs as well. For archival CD-R storage gold gold media which appear gold on both sides and silver blue silver on top blue on bottom are likely to last longer than are gold green media. The storage media that work best for you may depend on your tape or CD-R drive for some drives certain types of tapes last the longest or certain CD-R brands produce the fewest duds. Pay attention to trends and save your company some money by buying the type the drive likes. Never pull tapes out while they are active let the tape finish and rewind. If you ve used a nonrewinding device file let it finish the current process and then rewind the tape with mt. Most tape drives automatically rewind a tape when you insert it in the drive if it s not already rewound so removing a nonrewound tape won t save you any time in the long run. Pulling an active tape out of the drive is a good way to damage the tape. If you get errors when trying to read or write to a tape try cleaning the drive heads with the appropriate cleaner tape. Often dirty heads cause a tape drive to report write or read errors incorrectly. Don t forget to follow the drive manufacturer s instructions about tape cleaning. If you get errors when you write a CD-ROM try a slower write speed or a better quality of media. Also try to reduce the bus load for the appropriate data bus. Before using a tape drive for real backups perform a test backup of a lot of static data such as the contents of the usr directory tree and use your tape software s comparison feature such as tar s diff or compare commands . If the software reports changes to files that should not have changed you should track down the source of the problem. One of us once discovered a bizarre incompatibility between