Chapter 5 . (Shared web hosting) Using Partitions and File Systems
Chapter 5 . Using Partitions and File Systems 213 Option Use -y Assumes yes to all questions. -c Checks for bad blocks. -f Forces a check even if the file system is marked clean. -r Interactively prompts for changes. -v Be verbose. -b SUPERBLOCK Uses an alternative superblock. -l BADBLOCKS-FILE Adds to bad blocks list. -L BADBLOCKS-FILE Sets bad blocks list. -A Checks all file systems listed in /etc/fstab. -C Displays a completion/progress bar. Currently only works for ext2 file systems. -N Doesn t execute, simply displays what would be done. -P Used with A; processes the root file system in parallel with others. -R Used with A; causes the root file system to be skipped. -V Displays version information. These options are especially useful for specifying bad blocks and the superblock. The ability to specify an alternative superblock allows for the file system to be recovered in the case of a corrupt or damaged superblock. Copies of the superblock are stored throughout the disk, and an alternative superblock can be specified. As mentioned earlier in this chapter, a backup superblock is stored at throughout the file system. During the fsckcheck of a system the following is done: . Pass 1: Checking inodes, blocks, and sizes . Pass 2: Checking directory structure . Pass 3: Checking directory connectivity . Pass 4: Checking reference counts . Pass 5: Checking group summary information
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