Storage system redundant array of solid state disk array

A storage system comprising:

• a storage processor coupled to a plurality of solid state disks (SSDs) and a host, the plurality of SSDs being identified by SSD logical block addresses (SLBAs), the storage processor responsive to a command from the host to write data to the plurality of SSDs, the command from the host accompanied by information used to identify a location within the plurality of SSDs to write the data, the identified location referred to as a host LBA, the storage processor including a central processor unit (CPU) subsystem and maintaining unassigned SSD LBAs of a corresponding SSD, the CPU subsystem being operable to:
• upon receiving a command to write data, generate sub-commands based on a range of host LBAs derived from the received commands and a granularity, at least one of the host LBAs of the range of host LBAs being non-sequential relative to the remaining host LBAs of the range of host LBAs,
• assign the sub-commands to unassigned SLBAs wherein each sub-command is assigned to a distinct SSD of a stripe, the host LBAs being decoupled from the SLBAs;
• calculate a running parity of the stripe;
• upon completion of assigning the sub-commands to the stripe, save the calculated parity to one or more of the SSDs of the stripe;
• and
• continue to assign until the sub-commands are assigned to remaining SLBAs of the stripe.

A method of employing a storage system comprising:

• receiving a command from the host to write data to a plurality of SSDs, the command from the host accompanied by information used to identify a location within the plurality of SSDs to write the data, the identified location referred to as a host LBA, the plurality of SSDs being identified by SSD logical block addresses (SSD LBAs), the storage processor including a central processor unit (CPU) subsystem and maintaining unassigned SSD LBAs of a corresponding SSD;
• upon receiving the command to write data, the CPU subsystem generating sub-commands based on a range of host LBAs derived from the received commands and a granularity, at least one of the host LBAs of the range of host LBAs being non-sequential relative to the remaining host LBAs of the range of host LBAs;
• mapping the sub-commands to unassigned SSD LBAs wherein each sub-command is mapped to a distinct SSD of a stripe, the host LBAs being decoupled from the SSD LBAs (SLBAs);
• repeating the mapping step for remaining SSD LBAs of the stripe until all of the SSD LBAs of the stripe are mapped,
• calculating parity for the stripe;
• and
• saving the calculated parity to one or more of the SSDs of the stripe.