Hewlett-packard Development Company, L.P.

Rajiv Kumar Grover

Santosh Ananth Rao

Krishna Babu Puttagunta

George Shin

Banu Amalkanti

Peter Jansz

Systems and methods for implementing device loading in storage networks are disclosed. In an exemplary implementation a computer program product encodes a computer program for executing on a computer system a computer process. The computer process comprises identifying a plurality of storage devices to be configured in a storage network, identifying a number of host port LUNs configured on each of the storage devices, and identifying a number of host port connections to the storage devices. For each host port connection, the computer process determines actual loading for each of the storage devices based at least in part on the queue depth for each of the host port LUNs.

Device loading in storage networks

Systems and methods for adjusting the number of tasks that are accepted for processing in a computer based on processing resources required by the tasks, processing resources available in the computer system, and the time allowed to complete at least one of the tasks. The tasks that are accepted for processing can be scheduled to timeshare the processing resources available so that the task(s) complete within the time allowed.

Systems and methods for adjusting service queue capacity

Described herein are exemplary storage network architectures and methods for diagnosing a path in a storage network. Devices and nodes in the storage network have ports. Port metrics for the ports may be ascertained and used to detect link problems in paths. In an exemplary described implementation, the following actions are effectuated in a storage network: ascertaining one or more port metrics for at least one device at a first time; ascertaining the one or more port metrics for the at least one device at a second time; analyzing the one or more port metrics from the first and second times; and determining if the analysis indicates a link problem in a path of the storage network.

Diagnosing a path in a storage network

A method for processing a fiber channel (FC) layer service request at a target node of an FC network may include receiving the FC layer service request from an initiator node, extracting a permanent identifier and a temporary identifier from the received FC layer service request, and determining whether a match exists between the extracted temporary identifier and a temporary identifier stored in association with the extracted permanent identifier. A security access device and computer-readable code arrangement may include similar features.

System and method for processing fibre channel (FC) layer service requests in an FC network

In certain, currently available data-storage systems, incoming commands from remote host computers are subject to several levels of command-queue-depth-fairness-related throttles to ensure that all host computers accessing the data-storage systems receive a reasonable fraction of data-storage-system command-processing bandwidth to avoid starvation of one or more host computers. Recently, certain host-computer-to-data-storage-system communication protocols have been enhanced to provide for association of priorities with commands. However, these new command-associated priorities may lead to starvation of priority levels and to a risk of deadlock due to priority-level starvation and priority inversion. In various embodiments of the present invention, at least one additional level of command-queue-depth-fairness-related throttling is introduced in order to avoid starvation of one or more priority levels, thereby eliminating or minimizing the risk of priority-level starvation and priority-related deadlock.

Method and system for achieving fair command processing in storage systems that implement command-associated priority queuing

A hardware-based mirroring agent that provides a LUN-based I/O interface to remote host computers, including mirrored LUNs, implemented via remote data storage devices. The hardware-based mirroring agent is similar to a disk array, but manages and provides to host computers an interface to remote data storage devices, rather than to internal data storage devices, as in the case of disk arrays.

Growing community of inventors

Folsom, CA, United States of America

Rajiv Kumar Grover