Emc IP Holding Company LLC

Eric Petsching

Ashok Tamilarasan

Ronald D Proulx

Wayne E Garrett, Jr

Peter Puhov

A technique is directed to providing resiliency to a redundant array of independent disk (RAID) group which includes multiple storage devices. The technique involves operating the RAID group in a normal state in which each storage device is (i) initially online to perform write and read operations and (ii) configured to go offline in response to a respective media error count for that storage device reaching an initial take-offline threshold. The technique further involves receiving a notification that a storage device of the RAID group has encountered a particular error situation. The technique further involves transitioning, in response to the notification, the RAID group to a high resiliency state in which each storage device that is operable is (i) still online to perform write and read operations and (ii) configured to stay online even when the respective media error count for that storage device reaches the initial take-offline threshold.

Providing resiliency to a raid group of storage devices

Technique provides resiliency to RAID group including storage devices. Technique involves operating RAID group in normal state in which each storage device is initially online to perform write and read operations and configured to go offline in response to a media error count for that storage device reaching an end-of-life threshold and other storage devices in RAID group being healthy. Technique involves receiving a notification that a storage device of RAID group has encountered an error situation. Technique involves determining whether other storage devices of RAID group are healthy. Technique involves transitioning, in response to receiving notification and determining that other storage devices are healthy, RAID group from normal state to high resiliency degraded state in which the storage device is taken offline and the other storage devices are configured to remain online for facilitating the reconstruction of data associated with the storage device.

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Oxford, MA, United States of America

Eric Petsching