Balancing Mapped RAID background I/O with user I/O via dynamically changing background credits on Mapped RAID system and method

A computer-implemented method comprising:

• receiving, by a computing device, an I/O request for data, wherein the I/O request includes at least one of a user I/O request and a background operation I/O request;
• determining a number of storage devices of a plurality of storage devices in a Mapped RAID group that will be used to process the I/O request;
• determining that an amount of I/O credits available for the number of storage devices is insufficient, wherein each I/O credit represents an I/O operation on a storage device of the plurality of storage devices in the Mapped RAID group, wherein the amount of I/O credits available for the number of storage devices includes an amount of user I/O credits and an amount of background I/O credits;
• and
• tuning, dynamically, the amount of I/O credits available for the number of storage devices to process the I/O request based upon, at least in part, determining that the amount of I/O credits available for the number of storage devices is insufficient, wherein tuning, dynamically, the amount of I/O credits available for the number of storage devices includes balancing the amount of user I/O credits and the amount of background I/O credits for the number of storage devices.

A computer program product residing on a non-transitory computer readable storage medium having a plurality of instructions stored thereon which, when executed across one or more processors, causes at least a portion of the one or more processors to perform operations comprising:

• receiving an I/O request for data, wherein the I/O request includes at least one of a user I/O request and a background operation I/O request;
• determining a number of storage devices of a plurality of storage devices in a Mapped RAID group that will be used to process the I/O request;
• determining that an amount of I/O credits available for the number of storage devices is insufficient, wherein each I/O credit represents an I/O operation on a storage device of the plurality of storage devices in the Mapped RAID group, wherein the amount of I/O credits available for the number of storage devices includes an amount of user I/O credits and an amount of background I/O credits;
• and
• tuning, dynamically, the amount of I/O credits available for the number of storage devices to process the I/O request based upon, at least in part, determining that the amount of I/O credits available for the number of storage devices is insufficient, wherein tuning, dynamically, the amount of I/O credits available for the number of storage devices includes balancing the amount of user I/O credits and the amount of background I/O credits for the number of storage devices.