====== SnapRAID - Disks - Replace a parity disk ======

===== Ensure the array is synced =====

If the disk is still accessible, first ensure to have a synced array running a **sync** command:

<code bash>
snapraid sync
</code>

----

===== Copy the parity file to the new disk =====

Copy the big parity file to the new disk

A good copy command is ddrescue:

<code bash>
ddrescue /OLD_DISK/parity /NEW_DISK/parity /tmp/copy.log
</code>

<WRAP info>
**NOTE:**  This will copy the parity file from the old to new location, and in case of errors, it will continue copying what can be copied.

  * To retry to copy the problematic sections, just retry the same copy command.

Having a partial parity file, is still beneficial, as it will still allow to recover data as long it uses the valid part.

  * If the parity file is partially damaged or totally lost, try run the **"fix"** command to recreate it, but ensure to use the **-d** option to fix only the interested parity and not the other disks. <code bash>
snapraid fix -d PARITY_NAME
</code>

</WRAP>

----

===== Update the configuration file =====

Configure the new parity location in the configuration file.

----

===== Synchronize =====

Run **sync** again to make snapraid recognize the new disk.

<code bash>
snapraid sync
</code>

<WRAP info>
**NOTE:**  This command will be almost immediate.
</WRAP>

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