International Business Machines Corporation

Promise Technology, Inc.

Mohan Babu Rowlands

Mark A Johnson

Veera W Deenadhayalan

Raghuraman Govindasamy

Govindaraju Gnanasivam

Venkatanarasimhan Kannamangalam Ramakrishnan

Michael T Roble

Manoj Mathew

Ganesh Kumar

Carlos Querol

A method of operation of a disk storage system includes: providing a disk storage controller; coupling a first physical disk to the disk storage controller; detecting a failure of the first physical disk; and rebuilding a first logical drive, after replacing the first physical disk, includes: selecting a selected stripe of the first logical drive, reading a selected stripe status of the selected stripe, and marking the selected stripe as on-line in the selected stripe status.

Disk storage system with rebuild sequence and method of operation thereof

A method of operation of a redundant array of independent disks system includes: instantiating a first controller having a first local map and a first remote map; instantiating a second controller having a second local map and a second remote map mapped to the first local map; mapping a first memory device to the first local map by the first controller; coupling a storage device to the second controller and the first controller; and switching control of the storage device to the first controller, when a failure of the second controller is detected, by the first controller reading the first memory device.

Redundant array of independent disks system with inter-controller communication and method of operation thereof

A method of operation of a network storage system includes: receiving a host command for displaying a video stream; performing a forced read ahead of the video stream beyond the host command including: identifying a high definition video stream, dynamically setting a block count and a loop count for the forced read ahead, and transferring data from hard disk drives to a cache for anticipating a host next command; and transferring cached data from the cache for responding to the host next command for displaying the video stream.

Network storage system with data prefetch and method of operation thereof

A storage controller and associated disk or disk portion where after the controller terminates its access to said disk or disk portion, data integrity problems in the disk or disk portion can be detected. Before host data associated with a write command is written from the cache memory to the disk or disk portion, an identity of the storage controller as a current user of the disk or disk portion and indication that the controller is operating in a mode it stores data in a cache is recorded on the disk or disk portion. If the storage controller is shut down abnormally, the record of the identity of the controller and the indication are not cleared. The storage controller is restarted or rebooted and the record is read to learn that the controller was using the disk or disk portion and operating in the foregoing mode before the shutdown.

System and method for detecting data integrity problems on a data storage device

Apparatus and methods for detecting failure of a node in a cluster computer system. The apparatus include controllers programmed to cooperate. In one embodiment, the apparatus include first and second nodes with respective bus controllers communicatively coupled to each other and to a logical I/O device by means of a bus. The first node firstly recognizes the the second node as a node in the cluster. At some later point, a node whose communicative coupling has failed node is coupled to the cluster a second time. The first node recognizes this second coupling and, in response, queries the second node for failure-status information. The first and second nodes negotiate membership in the cluster for the second node on the first node's determining that the second node was the node that failed between the first and second couplings. Various embodiments follow: The first node firstly recognizes the second node as either a master or a slave node in the cluster. Then the negotiating of the second node's cluster membership includes ceasing to recognize the second node as the master node, negotiating slave membership in the cluster for the second node and thirdly recognizing the first node as the master node, on determining on the first node that the second node failed between the first and second couplings and that the second node was firstly recognized as the master node.

Growing community of inventors

Union City, CA, United States of America

Mohan Babu Rowlands