Efficient rebuild of storage devices in a redundant array of independent disks (raid)
AssigneeDell Products L.P.
InventorsAshokan Vellimalai, Deepu Syam Sreedhar M, Sandeep Agarwal, Anup Atluri
Life of this patent
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Abstract
Methods and systems for efficient rebuild of storage devices in a RAID may include generating a data-modified map of a storage device. The data-modified map may be updated when a RAID virtual device associated with the storage device is degraded to indicate write operations. The data-modified map may be used to rebuild selective portions of the storage device, instead of performing a full rebuild. The data-modified map may also be used to perform a full rebuild of the storage device.
Claims20
A method comprising:
- detecting a storage device added to a redundant array of independent disks (RAID) storage array controlled by a RAID controller;
- determining whether the storage device was previously used in the RAID storage array;
- and
- when the storage device was previously used in the RAID storage array:
- identifying a data-modified map previously generated for the storage device, the data-modified map indicating modified portions of the storage device;
- and
- based on the data-modified map, rebuilding the modified portions of the storage device.
An information handling system, comprising a redundant array of independent disks (RAID) controller, the RAID controller further comprising:
- a non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to:
- detect a storage device added to a RAID storage array controlled by the RAID controller;
- determine whether the storage device was previously used in the RAID storage array;
- when the storage device was previously used in the RAID storage array, identify a data-modified map previously generated for the storage device, the data-modified map indicating modified portions of the storage device;
- and
- when the storage device was not previously used in the RAID storage array:
- generate the data-modified map for the storage device;
- and
- set the data-modified map to indicate full rebuild of the storage device, wherein all portions of the storage device are indicated as modified portions in the data-modified map;
- and
- based on the data-modified map, rebuild the modified portions of the storage device.
A redundant array of independent disks (RAID) controller comprising:
- a non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to:
- detect a storage device added to a RAID storage array controlled by the RAID controller;
- determine whether the storage device was previously used in the RAID storage array;
- and
- when the storage device was previously used in the RAID storage array:
- identify a data-modified map previously generated for the storage device, the data-modified map indicating modified portions of the storage device;
- and
- based on the data-modified map, rebuild the modified portions of the storage device.
Dependencies are inferred from the claim text.