Emc Corporation

Emc Coropration

Rahul Bhagwat

Ajay Potnis

Jean-Pierre Bono

Sairam Veeraswamy

Miles Aram DeForest

Amit Dharmadhikari

Dixit Patel

Sairam Iyer

A file server architecture decouples logical storage from physical storage and provides proactive detection and containment of faults, errors, and corruptions in a file system, in order to enable in place (online) and non-intrusive recovery. The file system is built upon a thinly provisioned logical volume, and there are stored three copies of the metadata defining the logical volume in order to provide quick, deterministic, and reliable recovery from a faulted system. A first copy of the metadata is distributed among all of the slices of physical storage allocated to the logical volume. A second copy of the metadata is stored in a root slice of the logical volume. A third copy of the metadata is stored separate from the slices of physical storage allocated to the logical volume.

Deterministic recovery of a file system built on a thinly provisioned logical volume having redundant metadata

This invention is a system and a method for recovering and repairing a logical volume in a data storage environment using a new architecture. The method of recovering a logical volume enables mounting of a file system by instantiating only a single slice under the sparse volume and instantiating rest of the slices provisioned under the sparse volume in background by a asynchronous recovery process or on-demand by the clients of the file system issuing an I/O on the slice volume. The method of repairing a logical volume provides the ability to regenerate the metadata required to reconstruct the corrupted volume.

System and method for recovering a logical volume during failover or reboot of a file server in a data storage environment

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Karnataka, India

Rahul Bhagwat