Redundant array of independent disks systems that utilize spans with different storage device counts for a logical volume

A method comprising:

• identifying storage devices coupled with a Redundant Array of Independent Disks controller;
• receiving input requesting creation of a Redundant Array of Independent Disks logical volume;
• and
• defining multiple Redundant Array of Independent Disks spans to implement the logical volume, each span comprising one or more of the coupled storage devices, at least one of the spans including a different number of drives than at least one other span.

A non-transitory computer readable medium embodying programmed instructions which, when executed by a processor, are operable for performing a method comprising:

• identifying storage devices coupled with a Redundant Array of Independent Disks controller;
• receiving input requesting creation of a Redundant Array of Independent Disks logical volume;
• and
• defining multiple Redundant Array of Independent Disks spans to implement the logical volume, each span comprising one or more of the coupled storage devices, at least one of the spans including a different number of drives than at least one other span.