Looks like when you moved from SCSI to FC drives, your privious Block size 
on the drive was lower ( or heigher) then now, this would be a problem, 
check and see if you could lower the block size on one of your FC attached 
drives and make it read only ( if you could afford to do this) so that you 
can use it to restore till your data expires and them change to block size 
to match others, there may be alternate ways to do  it, but i would stay 
away from mixing block size in the same datazone while writing data.

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