Sun Microsystems, Inc.

Oracle America, Inc.

Sumit Gupta

John Forte

David C Weibel

Sajid Zia

Deepak M Babarjung

A storage array includes at least one target and a logical unit having a logical unit number. The storage array is configured to receive input defining a host group comprising at least one initiator and receive input defining a target group comprising the at least one target. The host group, target group and logical unit number define a view entry. The storage array is further configured to apply the view entry to the logical unit to provide a logical unit inventory that is provisioned for the at least one initiator.

Storage area network and method for provisioning therein

A method for handling input/output (I/O) commands in a storage system includes establishing first and second counters for counting unfinished I/O commands, and establishing a reference which is initially set to the first counter. The reference is periodically switched between the first counter and the second counter, and the switching interval is less than the I/O timeout value. Upon placing an I/O command into an I/O command queue, a copy of the current reference is made into an I/O specific control block and the current referenced counter is incremented. Upon finishing of an I/O command, the counter referenced by the I/O specific control block is decremented and the I/O command is removed from the I/O command queue. When switching the reference, a problem is detected in the event that the counter being switched to is above a predetermined threshold. Upon detection of a problem, a more explicit I/O check is conducted.

Near zero overhead command timeout scheme

A target discovery manager associated with a target discovery layer is interposed between a host initiator and one or more discovery protocols. The target discovery manager maintains a list of target devices found by each of several target discovery protocols. For each discovered target device listed, the associated discovery protocols that discovered the target device are prioritized and coalesced into a single enumerated target device register. The target device register provides the host initiator with a single list of known target devices produced from multiple discovery protocols with the discovery protocols that independently discovered each device prioritized according to various parameters.

Multi-protocol iSCSI device discovery for on demand device enumeration

A method for faster handling of state change notifications in a storage network such as storage area network (SAN). The method includes receiving a state change notification at a host. The notification is processed to identify a target device affected by a state change. The method includes cleaning an input/output (I/O) resource of the host of I/O operations associated with the target device. A new session request is transmitted from the host to the target device, such as the next communication from the host after receipt of the notification. The cleaning of the host's I/O resources may include killing or abandoning pending I/O operations related to the target device and may also include halting or stopping additional or future I/O operations to the target device. The method includes operating the affected target device to acknowledge the new session request and initiate a new session that includes refreshing target I/O resources.

Fast handling of state change notifications in storage area networks

A method is provided, the method comprising defining an actual size of each variable in a programming language at a declaration time when the actual size of the respective variable can be defined and declaring at least one variable in the programming language to have a dynamic size at the declaration time when the actual size of the at least one variable is not known. The method also comprises defining the actual size of the at least one variable in the programming language when the actual size of the at least one variable becomes known after the declaration time.

Growing community of inventors

Newark, CA, United States of America

Sumit Gupta