Recovery of an 'out-of-sync' file system
George W. Fleming
gwf at sapphire.bellcore.com
Fri Feb 1 00:47:49 AEST 1991
We recently had a most curious thing happened to our Sun server, I was
wondering if anyone has seen this. I am interested in how to prevent
this from happening again and how to fix it:
Problem: A NFS client noticed, while performing a 'make', that many of her
files (that reside on the server) had their contents swapped, i.e. the
contents of file A now appears under the filename B, the contents of B
appears under the filename C, etc.
Hardware Configuration: Server is Sun Sparc 1+, running 4.1.1. The client
machine is also a Sparc 1+, running 4.1. The Ethernet is twisted-pair.
My Guess on What Happened: A glitch occurred over the network while
the client is attempting to 'sync' with the server, causing the inode/
superblock table to be displaced or messed up.
Even though contents of all the files should still be on the disk, I was
not able to figure out how to recover them. I tried Sun's fsck and all
it did was to eliminate some files that it did not like.
Does anyone know why this occured. How to prevent it. And is there a way
for recovering from such a problem? Any info/experiences would be
appreciated.
--
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George W. Fleming
gwf at sapphire.bellcore.com
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