Emc IP Holding Company LLC

Kiran B Halwai

Ajay Potnis

Adnan Sahin

Amit Dharmadhikari

Rashmi Shashidhar

Pavan Ym

Techniques for performing a restoration may include: creating a first snapshot of a primary file system at a first point in time; and at a second point in time, performing first processing to restore at least a portion of the primary file system from the first point in time. The first processing may include: creating a second snapshot of the first snapshot of the primary file system; exporting the second snapshot as a first target device; mounting the first target device as a read-write checkpoint file system; performing file system consistency processing on the read-write checkpoint file system; and subsequent to performing the file system consistency processing on the read-write checkpoint file system, restoring at least a portion of the primary file system from the second snapshot using the read-write checkpoint file system. The file system consistency processing may include correcting metadata inconsistencies of the read-write checkpoint file system.

File system restoration using block-based snapshots and file system consistency check

A first Software Defined Network Attached Storage (SDNAS) process on a first storage system forwards snapshots of a file system provided by the first storage system to a second SDNAS process on a second storage system. The snapshots are forwarded by the first SDNAS process on an Internet Protocol (IP) network, to enable the first and second SDNAS processes to maintain redundant access to data of the file system without requiring the first storage system and second storage system to be interoperable. The initial snapshot includes a full version of the file system and subsequent snapshots include changed portions of the file system. Where the snapshot identifies changed portions at the extent level of granularity, the first SDNAS process subdivides the extents into sub-blocks, and only transmits changed sub-blocks of the extents on the IP network.

File system replication between software defined network attached storage processes using file system snapshots

A method of dynamic binding and unbinding thin logical storage volumes to data volumes stored in a storage array includes creating a snapshot copy of a user file system, storing the snapshot copy of the user file system in a data volume in the storage array, and binding a logical storage volume to the data volume. The logical storage volume is then used, by a snapshot file system, to access the data volume. If the data volume is not accessed for a period of time, the logical storage volume is unbound from the data volume while maintaining the snapshot copy of the user file system in the data volume. If an access event later occurs on the data volume, a second logical storage volume is bound to the data volume and used by the snapshot file system to access the data volume in connection with the access event.

Method and apparatus for dynamic binding and unbinding thin logical storage volumes to snapshots of a file system

A storage system includes a storage array having physical storage resources, a Software Defined Network Attached Storage (SDNAS) process running in an emulation on the storage system, a user file system having user file system data stored in the storage array that is accessed by the SDNAS process via a first Thin Logical Unit (TLU) storage volume mounted on an emulation operating system, a snapshot copy of the user file system stored in the storage array, and control logic. In some embodiments, the control logic is configured to associate a logical view of the snapshot copy of the user file system to a second TLU, mount the second TLU on the emulation operating system as a snapshot copy file system, and replay pending transactions and sub-transactions of the user file system on the snapshot copy file system to bring the snapshot copy file system to a stable state.

Growing community of inventors

Pune, India

Kiran B Halwai