Is there any detailed documentation about RAIDZ geometry? I has been wandering 
how zfs remembers which disk sectors are for data and which ones are for parity.

In his blog, Jeff wrote "Every block is its own RAID-Z stripe" does that mean 
zfs writes exactly one block in every write action? 

He also wrote "You have to traverse the filesystem metadata to determine the 
RAID-Z geometry" where these metadata stored?
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