====== SnapRAID - Parity - Split Parity ======

Split the parity across multiple partitions. 

  * Multiple files can be specified for a single parity.
  * As soon a file cannot grow anymore, the next one starts growing.

In the configuration file, just put more files in the same 'parity' line, separated by , (comma).

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The parity disk needs to be as large or larger than the data disks.

<WRAP info>
**NOTE:**  Historically, adding larger **data** disks to the array always required to similarly needing to also increase the **parity** disk to be as large or larger than the largest data disk.

  * This would mean needing to potentially acquire an additional large disk to ensure the parity was also as larger as this new data disk.
  * More cost...

Assuming the array is made up of (4) 4TB data disks and (1) 4TB parity disk.

  * If a new 8TB data disk was added to the array, then the current 4TB parity disk would not be large enough.
  * This would require to also having to replace the parity disk with a similar 8TB disk.

With split parity, there is no need to replace the parity disk with a new larger disk.

  * Instead, some smaller disks can be joined together as one complete set of parity.

For example, as there is a new 8TB data, this means that there should also be at least 8TB of parity.

  * (2) 4TB disks could be used, joined together as one complete set of parity; or
  * (4) 2TB disks, could be similarly joined.

</WRAP>

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===== Example =====

<file bash /etc/snapraid.conf>
parity /mnt/split-parity/parity1-disk1/part1.parity,/mnt/split-parity/parity1-disk2/part2.parity
2-parity /mnt/split-parity/parity2-disk1/part1.parity,/mnt/split-parity/parity2-disk2/part2.parity
</file>



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[[SnapRAID:Parity:Split Parity|Split Parity]]