Distributed journaling for write operations to raid systems

A storage system, comprising

• a main data storage on a plurality of storage devices associated with a redundant array of independent disks (RAID) group;
• a non-volatile journal storage associated with the main data storage also stored on the plurality of storage devices, wherein the non-volatile journal storage comprises a journal data storage portion and a journal metadata storage portion, wherein the journal data storage portion comprises respective journal data spaces across the plurality of storage devices and the journal metadata storage portion comprises respective journal metadata spaces across the plurality of storage devices;
• a RAID controller configured to:
• determine that the RAID group has restarted;
• in response to a determination that, prior to a restart, the RAID group did not shut down gracefully, scan the respective journal metadata spaces across the plurality of storage devices to determine a set of metadata associated with a write operation;
• in response to a determination that the set of metadata associated with the write operation is valid:
• determine that the write operation was not successfully completed prior to the restart;
• read at least one of a set of data chunks and a set of parity chunks corresponding to the write operation from respective journal data spaces of relevant storage devices based at least in part on the set of metadata;
• and
• write the at least one of the set of data chunks and the set of parity chunks corresponding to the write operation to the main data storage.