Emc Corporation

John O'Shea

Michael Sgrosso

Jeffrey Kinne

William F Baxter

Steven T McClure

Christopher S MacLellan

Yechiel Yochai

A data storage system having protocol controller for converting packets between PCIE format used by a storage processor and Rapid IO format used by a packet switching network. The controller includes a PCIE end point for transferring atomic operation (DSA) requests, a data pipe section having a plurality of data pipes for passing user data; and a message engine section for passing messages among the plurality of storage processors. An acceleration path controller bypasses a DSA buffer in the absence of congestion on the network. Packets fed to the PCIE end point include an address portion having code indicating an atomic operation. An encoder converts the code from a PCIE format into the same atomic operation in SRIO format. Each one of a plurality of CPUs is adapted to perform a second DSA request during execution of a first DSA request.

Method for performing a raid operation in a data storage system

A method is provided for transmitting user data from a selected one of a plurality of data pipes. The method includes having a ring manager select one of the data pipes from a pool of the data pipes for transmission of the user data. The data is transmitted from the selected one of the data pipes at least one packet switching network. The data pipe detects whether there was an error in the transmission. If there an error detected, the data pipe generates an error interrupt for the ring manager. The ring manager detects the error interrupt and generates an error interrupt for a CPU. The ring manager removes the selected one of the data pipes from the pool of data pipes for a predetermined period of time while the ring manager continues to work on other tasks until the time has expired. During pipe retirement, the physical pipe removed from the pool of pipes is disabled and the router will then direct orphan packets to the error ring. When the time has expired, the ring manager returns the selected data pipe to the pool of available data pipes.

Data storage system

Method of operating a data storage system having plural data pipes

Data storage system having plural data pipes

Protocol controller for a data storage system

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Newton, MA, United States of America

John O'Shea