Hewlett-Packard Development Company, L.p.

Hewlett Packard Enterprise Development LP

Pruthviraj Herur Puttaiah

Balaji Natrajan

Michael G Myrah

Satish Kumar Mopur

Sohail Hameed

Sridhar Balachandriah

Implementations of the disclosed technology may respond to a discovery request according to the origination of the discovery request. In these implementations, a discovery request for a connection to a device assigned to a reusable zone may be obtained. If the discovery request does not originate from a local switch group, the discovery response may indicate that there is no device at the connection.

Reusable zone

An example method includes (i) creating, by a first serial attached SCSI (SAS) switch, a first topology map describing a portion of a SAS fabric associated with the first SAS switch; (ii) receiving, at the first SAS switch and from a second SAS switch, a second topology map describing a portion of the SAS fabric associated with the second SAS switch; and (iii) merging, by the first SAS switch, the first topology map and the second topology map to produce a consolidated topology map of the SAS fabric.

SAS fabric discovery

A zone manager to provide a host with a list of storage drives that are not zoned to the host. The zone manager, in response to receipt of a command from the host to perform zone storage configuration for the host, to zone to host storage drives that were selected by the host from the list of storage drives.

Host based zone configuration

A method is provided for a SAS (Serial Attached SCSI (Small Computer System Interface)) expander to manage power consumption of a wide port that includes multiple expander phys each operable in at least three power conditions. The method includes monitoring number of AIP primitives for the wide port over time, changing at least one expander phy to a lower power condition when the number of AIP primitives total less than a first threshold over a first period of time, and changing at least one expander phy to a higher power condition when the number of AIP primitives total more than a second threshold over a second period of time.

SAS power management

A method of selectively exposing expanders in a data storage fabric is disclosed. The method includes generating a phy permission table in a switch expander. The phy permission table is configured for access by an initiator and includes data as to which enclosure expanders are discoverable by the initiator. A zone group of phys from the enclosure expanders assigned to the initiator is created. The phy permission table is updated to identify each phy coupled to the enclosure expanders in the zone group.

Exposing expanders in a data storage fabric

An embodiment of a method of managing multipathing in a computer system including the steps of establishing a plurality of concurrent multipathing processes on the computer system; disassociating a plurality of operational data paths from a first of the multipathing processes; and associating the operational data paths with a second of the multipathing processes.

Methods and apparatus for managing multipathing software

An example disclosed is directed to a switch. The switch includes a communication interface and a discovery module. The discovery module is to receive a registration request for bulk discovery from an initiator device via the communication interface. The discovery module is further to receive a change indication specifying that a change has occurred in a fabric associated with the switch, and update a data model based on the received change indication to generate an updated data model. The discovery module then filters the updated data model to generate a filtered data model, and sends the filtered data model to the initiator device via the communication interface.

SAS switch that supports bulk discovery wherein the bulk discovery is either on a push basis or pull basis

In an embodiment, a method of operating a zone manager of an input/out system includes, in response to a storage device being inserted into a particular storage-device location of the input/output system, determining whether the particular storage-device location and the storage device are assigned to a same server of the input/output system, and assigning the particular storage-device location and storage device to the same server in response to determining that the particular storage-device location and the storage device are not assigned to the same server.

Growing community of inventors

Tomball, TX, United States of America

Pruthviraj Herur Puttaiah