jgroves@hawk.ulowell.edu (Jonathan Groves) (11/19/90)
I posted this article in comp.unix.internals, but since then 2 other twin Vax Server 3600 have had the exact same error in the same partition (/dev/ra0f). Last Friday we experienced a 1/2 minute black/brown out, with a power surge. We expect this is our culprit, but why that particular cylinder? Is this a resting position for the head, and when it powered back up zapped the disk? I hope someone here may be able to help me. Thanx. JG> Today one of our file servers crashed [Ultrix] and JG> when it tried to come back up, it failed during the fsck. JG> JG> After an interactive session with fsck, the disk still JG> failed, and another interactive fsck leaves me with this: JG> (Comments from M.K.McKusick's FSCK document (1983), JG> included with Ultrix Supplementary Docs. Volume 3) JG> JG> ** /dev/ra0f JG> ** Last Mounted on /usr/users JG> ** Phase 1 - Check Blocks and Sizes JG> CG 0: BAD MAGIC NUMBER JG> 1763713056 BAD I=28 JG> [Several of these] JG> 1601463663 BAD I=28 JG> EXCESSIVE BAD BLKS I=28 JG> CONTINUE? y JG> JG> # CG c: BAD MAGIC NUMBER JG> # The magic number of cylinder group c is wrong. JG> # This usually indicates that the cylinder group maps have JG> # been destroyed. When running manually the cylinder group JG> # is marked as needing to be reconstructed. JG> JG> ? How is the map reconstructed, and at what phase of fsck? JG> ? Obviously after where it dies on me. JG> ? Is this happening because I "corrected" part of the JG> ? file system that I shouldn't have? JG> JG> ** Phase 2 - Check Pathnames JG> ROOT INODE UNALLOCATED. TERMINATING. JG> JG> # ROOT INODE UNALLOCATED. TERMINATING. JG> # The root node (usually inode number 2) has no allocate mode bits. JG> # This should never happen. The program will terminate. JG> JG> ? So what do I do? JG> ? I newfs/mkfs and restore from backups... JG> ? Is there any way I could have "repaired" the disk using JG> ? some kind of file system binary editor (fsdb?)? JG> ? Where would I find such an editor? JG> ? Where would I find info on where info is stored on JG> ? the disk and in what format? JG> JG> In several places the document concludes the solution to be JG> "See a guru." But there's no guru index. :-) JG> JG> I hope someone out there can answer these questions... JG> +-+n Jonathan Groves Internet: jgroves@hawk.ulowell.edu | |U Snail: 1 Univ. Ave. BOX 487 UUCP: ...!bbn!ulowell!hawk!jgroves | \_/+ Dungeon: (508)452-8586 [Voice] +----+ ULowell 1 University Avenue Lowell, MA 01854 (508)934-4000