International Business Machines Corporation

Rafael Velez

Omar Cardona

Pedro V Torres

Andres Herrera

Carlos D Cavanna

Hamdi Roumani

Jeffrey Bloom

Zixi Gu

Vitaly Mayatskikh

Provided are techniques for providing a global unique identifier for a storage volume. Under control of a storage initiator, a Global Universally Unique Identifier (GUUID) is identified for a storage volume of a storage device in a cloud system storing a plurality of storage devices, wherein the GUUID is generated for use with an ATA over Ethernet (AoE) protocol. The GUUID is stored in bytes of a packet header structure. Metadata is stored in remaining portions of the packet header structure. A request with the packet header structure is sent to a storage target.

Providing a global unique identifier for a storage volume

A first driver may register with a shim application that is disposed between a kernel block subsystem and the first driver. The first driver may suspend its IO requests upon being unloaded. The first driver may pass internal objects to the shim as one or more pointers. The first driver may deregister from the shim. A second driver may register with the shim. The IO requests may resume using the second driver.

Live upgrade of storage device driver using shim application

Processing data packets from a receive queue is provided. It is determined whether packets are saved in a pre-fetched queue. In response to determining that packets are not saved in the pre-fetched queue, a number of packets within the receive queue is determined. In response to determining the number of packets within the receive queue, it is determined whether the number of packets within the receive queue is greater than a number of packets called for by an application. In response to determining that the number of packets within the receive queue is greater than the number of packets called for by the application, an excess number of packets that is above the number of packets called for by the application is saved in the pre-fetched queue. An indication is sent to the application of the excess number of packets. The predetermined number of packets is transferred to the application.

Processing data packets from a receive queue in a remote direct memory access device

A mechanism is provided in a data processing system for shared buffer affinity for multiple ports. The mechanism configures a physical first-in-first-out (FIFO) buffer with a plurality of FIFO segments associated with a plurality of network ports. The plurality of network ports share the physical FIFO buffer. The mechanism identifies a FIFO segment under stress within the plurality of FIFO segments. The mechanism reconfigures the physical FIFO buffer to assign a portion of buffer space from a FIFO segment not under stress within the plurality of FIFO segments to the FIFO segment under stress.

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Cedar Park, TX, United States of America

Rafael Velez