Hewlett-packard Development Company, L.P.

Joseph David Black

Balaji Natrajan

Michael G Myrah

Stephen M Schultz

Nhan Q Vo

Nathaniel S DeNeui

Chiung-Shang Wu

Rajavel Gnanapragasam

An initiator zoning in progress command is provided. In one aspect the zoning in progress command includes target devices. Upon completion of the zoning operation, a zoning complete command is provided. In another aspect, receipt of a zoning in progress command causes broadcast change commands to be ignored until the zoning complete command is received.

Initiator zoning in progress command

Shared cache modules, systems, and methods are provided herein. The shared cache module is useable with at least one initiator on a serial attached small computer system interface system. The shared cache module includes a memory device and a memory interface. The memory device assigns each of the at least one initiator to a portion of a cache memory on the memory device. The memory interface indexes the assignment and communicates with the at least one initiator to perform a memory task.

Shared cache module and method thereof

Expanding capacity of a logical volume is described. In an example a logical volume is described by a global metadata unit and a plurality of local metadata units. The global metadata unit includes a description of the logical volume, a list of the plurality of local metadata units, and ranges of logical blocks of the logical volume corresponding to the plurality of local metadata units. Each of the local metadata units includes a description of a local RAID set and a range of logical blocks on the local RAID set. When a new drive is to be added to the logical volume to increase capacity, a new local metadata unit is created. The new local metadata unit includes a description of a new local RAID set to be added to the RAID volume and a range of logical blocks on the new drive. The new local metadata unit is added to the global metadata unit to expand the logical volume to incorporate the new local RAID set.

Capacity-expansion of a logical volume

Techniques for implementing a multicast write command are described. A data block may be destined for multiple targets. The targets may be included in a list. A multicast write command may include the list. Write commands may be sent to each target in the list.

Multicast write commands

A SAS expander that includes a virtual device manager and a communications manager. The virtual device manager is to generate a virtual device table comprising virtual device PHYs associated with virtual device drivers for host device drivers to allow communication between the host device drivers. The communications manager is to receive a request from a first host device driver of a first host to communicate with a second host device driver of a second host, and in response to receipt of the request, establish communication between the first host device driver and a virtual device PHY associated with a virtual device driver of the second host device driver.

SAS expander for communication between drivers

A storage system is disclosed including storage devices configured to store data, and a logical storage volume coupled to the storage devices and configured to store a subset of the data as segments. The storage system also includes a controller including a cache and memory. The memory is configured to include records such that each record corresponds with a segment in the logical storage volume and each record includes information regarding data stored in the corresponding segment. The controller is configured to access the records in response to a cache miss of the cache to determine if requested data from the cache miss is stored and ready for access in the logical storage volume. The controller is also configured to update the subset of data stored in the segments as a function of cache misses.

Growing community of inventors

Houston, TX, United States of America

Joseph David Black