Ramya Te Subramanian

US Patent:

7428665, Sep 23, 2008

Filed:

Nov 12, 2004

Appl. No.:

10/986751

Inventors:

Ramya Subramanian - Fremont CA, US
Lai-Ying Lau Stepan - Fremont CA, US

Assignee:

LSI Corporation - Milpitas CA

International Classification:

G06F 11/00

US Classification:

714 43

Abstract:

Methods and associated structure for rapidly detecting a catastrophic failure of a bus structure within a storage subsystem. Features and aspects hereof associated with SCSI bus storage system configurations coordinate such failure detection with standard monitoring features of the SAF-TE enclosure monitoring specifications. In particular, standard polling operations of a SAF-TE compliant enclosure may be terminated early so as to preclude queuing additional polling related commands for disk drives or an enclosure of disk drives coupled to a SCSI bus cable or backplane that has experienced a catastrophic failure. Other features and aspects hereof disable all disk drives in a storage system that are coupled to a failed common bus.

US Patent:

7853831, Dec 14, 2010

Filed:

Oct 26, 2007

Appl. No.:

11/924813

Inventors:

Ramya Subramanian - Fremont CA, US
Lai-Ying Lau Stepan - Fremont CA, US

Assignee:

LSI Corporation - Milpitas CA

International Classification:

G06F 11/00

US Classification:

714 43

Abstract:

Methods and associated structure for rapidly detecting a catastrophic failure of a bus structure within a storage subsystem. Features and aspects hereof associated with SCSI bus storage system configurations coordinate such failure detection with standard monitoring features of the SAF-TE, enclosure monitoring specifications. In particular, standard polling operations of a SAF-TE compliant enclosure may be terminated early so as to preclude queuing additional polling related commands for disk drives or an enclosure of disk drives coupled to a SCSI bus cable or backplane that has experienced a catastrophic failure. Other features and aspects hereof disable all disk drives in a storage system that are coupled to a failed common bus.

US Patent:

20050086429, Apr 21, 2005

Filed:

Oct 15, 2003

Appl. No.:

10/685987

Inventors:

Paresh Chatterjee - Fremont CA, US
Basavaraj Hallyal - Fremont CA, US
Senthil Thangaraj - Fremont CA, US
Narasimhulu Kotte - Fremont CA, US
Ramya Subramanian - Fremont CA, US

International Classification:

G06F012/16

US Classification:

711114000, 711165000

Abstract:

A mechanism is provided for migration between stripe storage and redundant parity striped storage. When a disk is added to a disk array, the mechanism migrates from RAID 0 to RAID 5. For each row, the mechanism calculates parity for the row and, if the parity position is not the new drive, the mechanism writes the data from the parity position to the new drive and writes the parity to the parity stripe position. If a drive fails, the mechanism migrates back from RAID 5 to RAID 0. For each row, if the parity position is not the failed drive, reads the data from remaining drives, XORs the data stripes to get failed drive data, and writes the failed drive data to the parity position. If a read or write is received for the failed drive, the mechanism simply redirects the read or write to the parity position.

US Patent:

20140189378, Jul 3, 2014

Filed:

Dec 29, 2012

Appl. No.:

13/730926

Inventors:

Ramya Subramanian - Hayward CA, US
Vasudevan Srinivasan - Hillsboro OR, US

International Classification:

G06F 1/26

US Classification:

713300

Abstract:

Methods and apparatus relating to table driven multiple passive trip, platform passive thermal management are described. In one embodiment, the power consumption limit of one or more components of a platform is modified based on one or more thermal relationships between one or more power consuming components of the platform and one or more heat generating components of the platform. Furthermore, a first relationship of the one or more thermal relationships indicates a mapping between a plurality of temperature thresholds and a corresponding plurality of performance limits. Other embodiments are also claimed and disclosed.