My system doesn boot due to superblock problems with the root filesystem. What do I do?
Normally, you reboot in single user mode and run /usr/bin/fsck as root and everything is OK. If you get a message about errors/problems on /dev/dsk/c0d0s0, are told to run fsck manually in single user mode, and get this message: BAD SUPER BLOCK: BAD VALUES IN SUPERBLOCK USE AN ALTERNATIVE SUPERBLOCK to SUPPLY NEEDED INFORMATION e.g. fsck -F ufs -b=# [special]. then you may be able to recover from this if the disk isn’t entirely corrupted. The superblock stores important information about the file system. Because it is so important it is duplicated in several places. Hopefully one of the backup superblocks isn’t corrupted. To see duplicate locations of superblock, use newfs -Nv. For example, if your root slice is at /dev/dsk/c0d0s0, run this command: # newfs -Nv /dev/dsk/c0d0s0 You must specify -Nv so you don’t clobber your root slice with a new filesystem.
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