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pread(4, "", 512, 1500301909504)        = 0

which is about 1 meg past the end of the device.

>>
>>> $ sudo xfs_check /dev/sdd
>>> xfs_check: error - read only 0 of 512 bytes
>>>
>>> $ sudo xfs_repair /dev/sdd
>>> Phase 1 - find and verify superblock...
>>> xfs_repair: error - read only 0 of 512 bytes
>>
>> So both buffered and direct IO to the first block in the block
>> device are failing. I'd say your problems have nothing to do with
>> XFS. However, can you strace them and find out what the error that
>> is occuring actually is?
> 
> Strace is giving me:
> wait4(-1, xfs_check: /dev/sdd is not a valid XFS filesystem (unexpected SB magic number 0x00000000)

now that is something else...

> xfs_check: WARNING - filesystem uses v1 dirs,limited functionality provided.
> xfs_check: read failed: Invalid argument
> cache_node_purge: refcount was 1, not zero (node=0x21ecef0)
> xfs_check: cannot read root inode (22)
> bad superblock magic number 0, giving up

those are different failures than first reported....

xfs_db -c "sb 0" -c "p" /dev/sdd still might be interesting.

-Eric

> I attached the entire strace logs to this email.
> 
> 
> 
> 
> 
> Do you have any idea what has caused this or how to fix it?
> 
> Thanks in advance!
> Chris
> 
> 
> 
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