US 2021/0263798 A1Published application

Raid storage-device-assisted parity update data storage system

AssigneeDell Products L.P.

InventorsGary Benedict Kotzur, William Emmett Lynn

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Abstract

A RAID storage-device-assisted parity data update system includes a first RAID primary data drive that DMA's second primary data from a host system, and XOR's it with first primary data to produce first interim parity data for a first data stripe. A second RAID primary data drive DMA's fourth primary data from the host system, and XOR's it with third primary data to produce second interim parity data for a second data stripe. A first RAID parity data drive DMAs the first interim parity data and XOR's it with first parity data to produce second parity data for the first data stripe that overwrites the first parity data. A second RAID parity data drive DMA's the second interim parity data and XOR's it with third parity data to produce fourth parity data for the second data stripe that overwrites the third parity data.

Claims20

Dependent claims

A Redundant Array of Independent Disk (RAID) storage-device-assisted parity data update system, comprising:

a host system;
a Redundant Array of Independent Disk (RAID) storage controller device that is coupled to the host system;
and
a plurality of RAID storage devices that are each coupled to both the host system and the RAID storage controller device, wherein the plurality of RAID storage devices include:
a first RAID parity data storage device storing first parity data for a first data stripe, wherein the first RAID parity data storage device is configured, in response to a first command received from the RAID storage controller device, to:
retrieve, via a first DMA operation from a first RAID primary data storage device included in the plurality of RAID storage devices, first interim parity data;
perform an XOR operation on the first parity data and the first interim parity data to produce second parity data for the first data stripe;
and
overwrite the first parity data with the second parity data;
and
a second RAID parity data storage device storing third parity data for a second data stripe, wherein the second RAID parity data storage device is configured, in response to a second command received from the RAID storage controller device, to:
retrieve, via a second DMA operation from a second RAID primary data storage device included in the plurality of RAID storage devices, second interim parity data;
perform an XOR operation on the third parity data and the second interim parity data to produce fourth parity data for the second data stripe;
and
overwrite the third parity data with the fourth parity data.

12 more elements

An Information Handling System (IHS), comprising:

a first RAID parity data storage device storing first parity data for a first data stripe, wherein the first RAID parity data storage device is configured, in response to a first command received from a RAID storage controller device, to:
retrieve, via a first DMA operation from a first RAID primary data storage device included in the plurality of RAID storage devices, first interim parity data;
perform an XOR operation on the first parity data and the first interim parity data to produce second parity data for the first data stripe;
and
overwrite the first parity data with the second parity data;
and
a second RAID parity data storage device storing third parity data for a second data stripe, wherein the second RAID parity data storage device is configured, in response to a second command received from a RAID storage controller device, to:
retrieve, via a second DMA operation from a second RAID primary data storage device included in the plurality of RAID storage devices, second interim parity data;
perform an XOR operation on the third parity data and the second interim parity data to produce fourth parity data for the second data stripe;
and
overwrite the third parity data with the fourth parity data.

8 more elements

A method for assisting with parity update operations using Redundant Array of Independent Disk (RAID) storage devices, comprising:

receiving, by a first RAID parity data storage device, a first command from a RAID storage controller device and, in response:
retrieving, by the first RAID parity data storage device via a first DMA operation from a first RAID primary data storage device included in the plurality of RAID storage devices, first interim parity data;
performing, by the first RAID parity data storage device, an XOR operation on first parity data stored in the first RAID parity data storage device and the first interim parity data to produce second parity data for the first data stripe;
and
overwriting, by the first RAID parity data storage device, the first parity data with the second parity data;
and
receiving, by a second RAID parity data storage device, a second command received from the RAID storage controller device and, in response:
retrieving, by the second RAID parity data storage device via a second DMA operation from a second RAID primary data storage device included in the plurality of RAID storage devices, second interim parity data;
performing, by the second RAID parity data storage device, an XOR operation on third parity data stored in the second RAID parity data storage device and the second interim parity data to produce fourth parity data for the second data stripe;
and
overwriting, by the second RAID parity data storage device, the third parity data with the fourth parity data.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/313,343Filed 6 May 2021
Priority: 27 Sep 2019
Published: 26 Aug 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

G06F 11/1076
Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's: parity data used in redundant arrays of…
G06F 3/0619
Improving the reliability of storage systems: in relation to data integrity, e.g. data losses, bit errors
G06F 3/0659
Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices: command handling…
G06F 3/0689
Plurality of storage devices: disk arrays, e.g. RAID, JBOD

Family

Application16/586,551Continuation · filed 27 Sep 2019
Application17/313,343Continuation
US 11,023,322 B2Related patent
US 11,494,266 B2Related patent
US 2021/0096951 A1Published application
US 2021/0263798 A1This patent

From the US filing history. Foreign family members aren’t listed.

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