Oracle International Corporation

Other

Eric Carl Taylor

Zhu Xiao

Roch Bourbonnais

Blaise Sanouillet

Randall C Joyce

A method of resilvering a plurality of failed devices in storage pools includes detecting a failure of a first storage device in a storage pool, identifying data blocks that were stored on the first storage device that are also stored on other storage devices, and resilvering the first storage device by transferring the data blocks from the other storage devices. While resilvering the first storage device, the method includes detecting a failure of a second storage device in the storage pool, identifying a subset of the data blocks that were stored on the first storage device that were also stored on the second storage device, and reusing a set of sequential I/O commands to resilver at least a portion of the second storage device with the subset of the data blocks.

Systems and methods for sequential resilvering

A method of resilvering a plurality of failed devices in a storage pool may include detecting a failure of a first storage device in the storage pool, and determining a plurality of data blocks that are stored on the first storage device. The method may also include sorting the plurality of data blocks into one or more buckets in an order in which the plurality of data blocks are located on the first storage device, and detecting a failure of a second storage device in the storage pool after detecting the failure of the first storage device. The method may further include determining that one or more of the plurality of data blocks are also located on the second storage device, and reusing at least part of the one or more buckets to resilver the second storage device.

Sequential resilvering of storage devices with reduced restarts

A method of reconstructing data from a failed storage device in a storage pool includes identifying a plurality of data blocks that are stored on the failed storage device, and sorting the plurality of data blocks in an order in which the plurality of data blocks are located on the failed storage device. Each of the plurality of data blocks may be associated with an I/O operation. The method may also include grouping the I/O operations for the plurality of data blocks into sequential I/O operations based on the order in which the plurality of data blocks are located on the failed storage device, and executing the sequential I/O operations to resilver a new storage device replacing the failed storage device.

Aspects of the present disclosure disclose systems and methods for managing space in storage devices. In various aspects, the disclosure is directed to providing more efficient method for managing free space in the storage system, and related apparatus and methods. In particular, the system provides for freeing blocks of memory that are no longer being used based on the information stored in a file system. More specifically, the system allows for reclaiming of large segments of free blocks at one time by providing information on aggregated blocks that were being freed to the storage devices.

Apparatus, system and method for managing space in a storage device

Implementations claimed and described herein provide systems and methods for the efficient rebuilding of a failed storage device through sequential resilvering. In one implementation, blocks for resilvering are discovered. The blocks correspond to input/output requests not successfully completed for a failed storage device. A coarse grained sorting of the blocks is performed based on a block location of each of the blocks on the failed storage device. The block locations of the blocks are stored in memory according to the coarse grained sorting. A fine grained sorting of the blocks is performed based on the coarse grained sorting of the blocks. The blocks are sequentially resilvered based on the fine grained sorting.

A device to be used on the legs of standard wooden folding stepladders to insure the stability of said ladders while being used on weak, non-compacted or slippery areas, into which a stepladder might tend to sink, or across which a stepladder might tend to slide. Said device consists of a semi-rigid pad that when attached to the bottom of any or all of the legs of any standard wooden folding stepladder will then increase the stepladder leg footprint area resulting in more stability of said stepladder. In addition, the high friction material of which the stepladder foot pad may be constructed will tend to prevent the stepladder legs from slipping across slippery surfaces.

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Superior, CO, United States of America

Eric Carl Taylor