Abstract: A subset of blocks from a set of blocks of a memory device are identified based on a valid data count constraint. A first block from the subset of blocks is selected based on a valid data count of the first block. A second block from the subset of blocks is selected based on a data temperature of the second block. A comparison of the first block and the second block is performed in accordance with one or more comparison criterion. The first block or the second block is selected as a garbage collection source block based on the comparison. Garbage collection is performed at the garbage collection source block.

Abstract: Methods, apparatuses and systems related to maintaining stored data are described. The apparatus may be configured to refresh the stored data according to schedule that includes different delays between successive refresh operations.

Abstract: A subset of blocks from a set of blocks of a memory device are identified based on a valid data count constraint. A first block from the subset of blocks is selected based on a valid data count of the first block. A second block from the subset of blocks is selected based on a data temperature of the second block. A comparison of the first block and the second block is performed in accordance with one or more comparison criterion. The first block or the second block is selected as a garbage collection source block based on the comparison. Garbage collection is performed at the garbage collection source block.

Abstract: A door and door frame system are disclosed in which a door is constructed with a thickness approximately equal to the thickness of the door frame and wall through which the associated doorway extends.

Abstract: A method, apparatus and program storage device for providing drive load balancing and resynchronization of a mirrored storage system. Data is pushed from a storage device at a source SAN device to a hot spare device of a destination SAN device, wherein the resynchronization rebuild process is incorporated with both the source SAN system and destination SAN system as RAID 0. In another embodiment, the resynchronization rebuild process is incorporated with just the destination SAN system as RAID 0. Nevertheless, RAID 10 performance is provided without the associated cost. A performance gain is provided by using RAID 0, the efficiency of drive space is increased, customer cost is minimized and the time to perform rebuild operations is decreased. Moreover, the present invention provides load balancing to storage devices in enclosures by balancing storage devices between multiple I/O channels.

Abstract: A method, apparatus, and program storage devices that can detect failures in data flow in high-availability storage systems is disclosed. The present invention provides a plurality of software layers that are to be executed in a predetermined order. An equation is implemented in each of the plurality of software layers. The equation provides a solution for determining when the plurality of software layers were executed in the predetermined order.