Qlogic Corporation

Sanjeev Jorapur

Kanoj Sarcar

Deepak Tawri

Kenneth Y Choy

Machine implemented method and system for processing a write request for a copy on write (COW) enabled write operation to write to a logical unit number (LUN) for which a replicated LUN exists is provided. An adapter coupled to a computing system and interfacing with the LUN and the replicated LUN receives the write request having an indicator indicating that the write request is for the COW enabled write operation. The adapter issues a read request to the LUN to read previous information from the LUN; temporarily stores the previous information at a memory storage location of the adapter; writes the previous information to the replicated LUN; writes the information based on the write request to the LUN; and notifies the computing system indicating that the write request for the COW enabled write operation has been completed.

Method and system for offloading copy on write operations

Machine implemented method and system is provided. The method includes sending a packet to a device by a computing system; determining an address for the packet, where an interface logic for the device determines the address; updating a location associated with the address; where the interface logic for the device updates the location; updating a bitmap value associated with the location to indicate to a processor for the device that a location associated with the address has been updated; where the interface logic updates the bitmap value; clearing the bitmap value by writing a same value that is read by the processor for the device; and processing the packet received by the device.

Method and system for communication across multiple channels

A machine implemented method and system for communication between a computing system and an adapter is provided. An application from among a plurality of applications sends a message to the adapter with a value V. The adapter queues the message at the first storage location and writes the value V at a second storage location after the message is successfully queued at the first storage location. To determine if the message was successfully queued, the computing system reads the written value at the second storage location and compares it to the value V that was sent with the message.

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San Jose, CA, United States of America

Sanjeev Jorapur