I am a fairly new system administrator. I have encountered the following
problem on an AlphaServer 2100A machine running Tru64-Unix 4.0 (plain).
The root file system is backed up to DLT tape by a script that includes the
following command:
/sbin/dump -0 -uf /dev/nrmt0h -b 64 /
The backup appears to complete normally. When I attempt to restore a file
from the dump using interactive restore, the file is restored correctly but
there are numerous "checksum errors":
> restore -i -v -b64
Verify tape and initialize maps
Dump date: Tue Oct 19 23:30:06 1999 PDT
Dumped from: Wed Dec 31 16:00:00 1969 PST
Level 0 dump of / on mithrandir.caltech.edu:/dev/rz0a
Label: No label
Extract directories from tape
Initialize symbol table.
restore > add .login~
restore > add .cshrc~
restore > add .profile~
restore > extract
Extract requested files
You have not read any tapes yet.
Unless you know which volume your file(s) are on you should start
with the last volume and work towards the first.
Specify next volume #: 1
Checksum error 104666, inode 25 file <name unknown>
extract file ./.profile~
Checksum error 27400244732, inode 41 file <name unknown>
Checksum error 34000244676, inode 83 file <name unknown>
Checksum error 102736, inode 141 file <name unknown>
Checksum error 162230, inode 227 file <name unknown>
Checksum error 244732, inode 229 file <name unknown>
Checksum error 37400244267, inode 231 file <name unknown>
Checksum error 204736, inode 240 file <name unknown>
Checksum error 244732, inode 276 file <name unknown>
extract file ./.login~
./.login~: file ALREADY EXISTS
Do you want to overwrite this file? [yn] y
... etc.
Attempting to extract files from further into the dump results in huge
numbers (thousands) of these error messages. The file system appears in all
functional respects to be fine, and the system is humming away without
problems.
Can anyone enlighten me on what is happening here? Is the problem with the
dump, the restore command, or the file system? What can I do to correct it?
Thanks in advance for your help,
Betsy Coles
Caltech Library Information Technology Group
bcoles_at_library.caltech.edu
Received on Thu Oct 21 1999 - 23:45:07 NZDT