Emc IP Holding Company LLC

Emc Corporation

Dell Products Inc.

Dale R Elliott

Stephen Richard Ives

Michael Garvey

Andrew Chanler

Krishnamoorthy Anantharaman

Kevin Thomas Marks

David Lionel Black

Malak Alshawabkeh

Amnon Izhar

Patrick J Weiler

Prakash Venkatanarayanan

Seema G Pai

Edward S Robins

Kevin Granlund

Sunil Gumaste

Christopher Monti

Abhilash Sanap

Zhigang Liu

Ravish Sachdeva

Pankaj Soni

Shen Liu

Jaleel A Kazi

ShashiKiran Talanki Ramanathagupta

Aspects of the present disclosure relate to detecting and correcting a storage array's drive sectors to prevent data loss. In embodiments, a storage array's telemetry information is monitored. Further, one or more state or operational metrics of the storage array's storage drives are measured. Additionally, each storage drive is scrubbed based on each drive's relative scrubbing priority defined by the telemetry information and each storage drive's state or operation metrics.

Storage media scrubber

An information handling system may include a host system processor and a storage resource communicatively coupled to the host system processor. The storage resource may be configured to, responsive to receiving a command from the host system processor relating an address range of the storage resource, create an entry in a drive status table stored in a persistent storage area of the storage resource, the entry setting forth information indicative of the address and a completion status of the command and update a status of the address range in the drive status table as steps of the command are completed by the storage resource, such that, if a drive event occurs preventing full completion of the command, the host system processor may access the drive status table to determine a status of the command, and take a remedial action based on the status of the command.

Systems and methods for safely detecting indeterminate states of ranges in a self-encrypting storage resource

A storage system in one embodiment comprises a host processor, and a solid-state storage device coupled to the host processor and comprising a non-volatile memory and a storage controller. The host processor is configured to initiate an error scanning operation on a designated portion of the non-volatile memory by directing at least one read command to the storage controller. The read command is configured to indicate to the storage controller that data read from the non-volatile memory responsive to the read command is not to be returned to the host processor. For example, the read command may illustratively comprise a Scatter Gather List (SGL) bit bucket descriptor indicating that the data read from the non-volatile memory responsive to the read command is to be discarded rather than returned to the host processor. The storage controller records any detected errors in a media error log and notifies the host processor of such errors.

Storage system with host-directed error scanning of solid-state storage devices

Individual storage devices of a RAID group are monitored for faults. A health indicator for each storage device is calculated based on fault growth rate. Non-failed storage device are swapped out based on the health indicator. Techniques for monitoring the storage devices include background media scans and growth list polling.

RAID failure prevention

A block CRC based fast data hash provides efficient data integrity verification functions. A hash word is generated from block CRCs that are stored along with data blocks in a hard drive for each data and/or parity track of a storage system, such as a RAID array. Each storage system member writes the hash word into a global memory. Thereafter, a director verifies data integrity using all member's hash words with one or more XOR operations. Use of the hash words for data integrity verification saves system bandwidth and CPU processing resources.

DIF-CRC based fast hashing

Described are techniques for verifying access to data on a device. A scrubbing deadline is received indicating an ending time by which a current scrubbing cycle is to complete. It is determined whether the scrubbing deadline will be met in accordance with one or more scrubbing criteria if device scrubbing operations are performed in a first mode. Device scrubbing operations are performed in the first mode if it is determined that the scrubbing deadline will be met in accordance with the one or more scrubbing criteria, and otherwise, performing device scrubbing operations in a second mode.

Techniques for media scrubbing

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Northborough, MA, United States of America

Dale R Elliott