mdadm format for manual destriping

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Hi,

is there a documentation available on how mdadm stores data? E.g.
1.  super-block
2.  offset of first block on each drive
3. whether mdadm stores blocks as raw data or stores some kind of
metadata associated with each block e.g. disk 1 -> data_block1
immidiatelly followed by data_block 5 or
metadata_for_block_1 | data_block 1 |  metadata_for_block_5 | data_block 5 |
4. how and where mdadm stores its backup superblock
5. what klind of XOR algorithm is used by mdadm

thanks,

Marek
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