Suhas Bangalore Prakash

US Patent:

20170031769, Feb 2, 2017

Filed:

Sep 29, 2015

Appl. No.:

14/869340

Inventors:

- Sunnyvale CA, US
Long Yang - Fremont CA, US
Kayuri H. Patel - Cupertino CA, US
Suhas Prakash - San Jose CA, US
Jeffrey S. Kimmel - Chapel Hill NC, US
Anshul Pundir - Sunnyvale CA, US
Arun Rokade - Fremont CA, US

International Classification:

G06F 11/14
G06F 3/06

Abstract:

A technique efficiently creates a snapshot for a logical unit (LUN) served by a storage input/output (I/O) stack executing on a node of a cluster that organizes data as extents referenced by keys. In addition, the technique efficiently creates one or more snapshots for a group of LUNs organized as a consistency group (CG) and served by storage I/O stacks executing on a plurality of nodes of the cluster. To that end, the technique involves a plurality of indivisible operations (i.e., transactions) of a snapshot creation workflow administered by a Storage Area Network (SAN) administration layer (SAL) of the storage I/O stack in response to a snapshot create request issued by a host. The SAL administers the snapshot creation workflow by initiating a set of transactions that includes, inter alia, (i) installation of barriers for LUNs (volumes) across all nodes in the cluster that participate in snapshot creation, (ii) creation of point-in-time (PIT) markers to record those I/O requests that are included in the snapshot, and (iii) updating of records (entries) in snapshot and volume tables of a cluster database (CDB).

US Patent:

20170031774, Feb 2, 2017

Filed:

Jul 31, 2015

Appl. No.:

14/815064

Inventors:

- Sunnyvale CA, US
Suhas Prakash - San Jose CA, US
Anshul Pundir - Sunnyvale CA, US
Ling Zheng - Saratoga CA, US

International Classification:

G06F 11/14
G06F 3/06

Abstract:

A snap restore technique efficiently restores snapshots of storage containers served by a storage input/output (I/O) stack executing on one or more nodes of a cluster. A Small Computer Systems Interface administration layer interacts with a volume layer of the storage I/O stack to manage and implement a snap restore procedure to restore one or more snapshots of a storage container. The storage container may be a logical unit (LUN) embodied as parent volume (active volume) and the snapshot may be represented as an independent volume embodied as read-only copy of the active volume. The snap restore procedure may be configured to allow restoration to a single snapshot of a LUN or restoration of a plurality of LUNs organized as a consistency group from a group of snapshots. Restoration of the LUN from a snapshot involves (i) creation of another independent volume embodied as a read-write copy (clone) of the snapshot, (ii) replacement of the (old) active volume with the clone, (iii) deletion of the old active volume, and (iv) mapping of the LUN to the clone (i.e., a new active volume).