RAID and NFS exports

[Sumit Shah]

Dear FreeBSD gurus,

I apologize in advance if this is not the most appropriate list to post 
this to, but this seems the best that I can find.  Here is my 
situation, we have an Abit AT7 motherboard with onboard RAID (HPT374).  
It has worked beautifully for us with FreeBSD 4.7 and then 4.8 for a 
good 8 months or so serving up NFS and Samba.  This morning my 
/etc/exports looked something like

/data6 machine1 machine2 -mapall=65534
/data8 machine1 machine2 -mapall=65534

I then added a line so it looked something like:

/data6 machine1 machine2 -mapall=65534
/data8 machine1 machine2 -mapall=65534
/data6 -network 10.10.10 -mask 255.255.255.0 -mapall=65534

I sent a HUP to mountd and everything seemed to work fine.  Then I 
started getting errors similar to:

ad4: hard error reading fsbn  242727552

So I rebooted and the HPT374 controller was complaining that the first 
disk in the RAID-0 configuration failed.  I thought this might be a bad 
disk, but we had an identical system with the same EXACT configuration 
and we started mountd on that with the same exports file from above.  A 
minute or two later the same type of errors and same complaint by the 
HPT374 controller about the first disk in the RAID-0 array being bad.

I was wondering if there is any, no matter how remote, possibility that 
by adding that third line to the exports file that the raid-0 got 
corrupted somehow and if so how to maybe reverse it.  I have left 
everything else intact nothing has changed on the controller side or 
freebsd config.

Just as a note, we are not using vinum, but using the created array 
(ar0) and formatting that as UFS.

Thanks so much for getting thorugh this email!

Sumit