Question on RAID-5 rmw & rcw(read modify write & read construct write)

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Hi,
 I am trying to understand read-modify-write & read-construct-write as
part of my HW accelerated RAID-5 driver debugging.  How it is decided on
stripe to be rmw/rcw ? 
Is this happen every time when application try to write to disks with
bio of less than a chunk size ?


  I am seeing file system inconsistencies while raid-5 recovery is
happening and writing data to /dev/md0 with ext3/ext2  installed and
mounted on a directory.

Thanks in advance,
Marri
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