File System Corruption

[Phil Thayer]

I ran into a problem where a file system was corrupted beyond repair and
wondered if anyone has seen anything like this before or has a
reasonable explanation.  Here is the scenario:
 
Linux was running on an Intel X64 system with two local drives mirrored
in Linux containing the swap file system.
The system was booting off a SAN drive where the rest of Linux was
loaded.
There were three other SAN LUN's being used that were:
    1. 500 GB
    2. 150 GB
    3. 35 GB (Linux LUN.)
 
We swapped the system hardware to a different box and changed the HBA to
be on the new box so the HBA Bios was still allowing the Boot from SAN.
The new box had two local drives but they were mirrored at the hardware
level with RAID 1 (so Linux would have only seen one drive drive.)
The system was rebooted and crashed with numerous file system corruption
errors.
The 500 GB LUN on the SAN got severely corrupted on the reboot of Linux
from the SAN with the new hardware to the point where it could not be
repaired.
 
What I am wondering is, What caused the system to get corrupted?
 
Is it possible that the lack of a swap file system mounted would have
caused this to happen?  Or is it because the /dev devices were not the
same as they were in the first configuration?
 
Any ideas?
 
 
Phillip Thayer
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