Emc Corporation

Daniel E Rabinovich

Adi Ofer

Stephen Richard Ives

Peng Yin

Ran Margalit

Rong Yu

Cynthia Burns

Gilad Sade

Henry L Steinberg

William P Powers, Jr

Amit Kumar

A scheduling method and apparatus for use by a processor that controls storage devices of a data storage system is presented. The method allocates processing time between I/O operations and background operations for predetermined time slots based on an indicator of processor workload.

Management of background copy task for point-in-time copies

A scheduler for selecting a logical volume for scheduling pending I/O tasks for job generation. The scheduler includes a main scheduler that selects from among multiple sub-schedulers that operate according to different scheduling approaches, e.g., high priority read I/O request scheduling, urgency of non-read I/O tasks, as well as load balancing and round robin schemes. In selecting a sub-scheduler, the main scheduler considers the amount of time allocated to performing read I/O requests, as well as the level of urgency associated with the logical volumes and the disk adapter that manages those logical volumes for non-read I/O tasks.

Device selection by a disk adapter scheduler

A system and method of providing an embedded controller network communication protocol, for controlling communications between a central controller and a plurality of active embedded controllers, wherein a first data transmission token (T2) is passed, under control of the central controller, from the central controller to an active embedded controller, back to the central controller, and then sequentially from the central controller to and from each coupled active embedded controller. Any active embedded controller may return data to the central controller only appended to the first token. A second data transmission token (T1) addressed to one active embedded controller is broadcast from the central controller to all of the active embedded controllers, with a data stream to be transmitted from the central controller to the addressed active embedded controller appended to the second data transmission token (T1). The first data transmission token (T2) is inserted between data bytes of a data stream appended to the second data transmission token to provide full duplex communication.

System for inserting first transmission token into data stream appended

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Wrentham, MA, United States of America

Daniel E Rabinovich