hi, guys:
  
  when I read the filestore.cc, I find the ceph use crc the check the data. Why 
should check the data?


  In my knowledge,  the disk has error-correcting code (ECC) for each sector. 
Looking at wiki: http://en.wikipedia.org/wiki/Disk_sector, "In disk drives, 
each physical sector is made up of three basic parts, the sector header, the 
data area and the error-correcting code (ECC)".  So if the data is not correct. 
the disk can recovery it or  return i/o error.
  
  Does anyone can explain it?


 Thanks
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