Patent application number | Description | Published |
20090193142 | Method to Allow a Host to Replace Logical Path Resources it Owns - A method for replacing logical path resources, a host is able to replace a logical path it owns with a new logical path. Such a system is especially applicable when the condition of “out of resources” has been reached for a port. With this system, a host is guaranteed that it can replace a logical path it owns with a new logical path. It is not necessary for a control unit to have reached its maximum number of logical paths per port. A host is able to replace one logical path with a new logical path any time. | 07-30-2009 |
20090193145 | METHOD, APPARATUS AND SYSTEM TO DYNAMICALLY MANAGE LOGICAL PATH RESOURCES - A system, apparatus, and method dynamically manages logical path resources by adding, removing, and establishing logic paths based on specified priority schemes associated with the logical path resources. Information associated with the logical path resources is updated in a logical path resource table. | 07-30-2009 |
20090210561 | PROCESSING OF DATA TO PERFORM SYSTEM CHANGES IN AN INPUT/OUTPUT PROCESSING SYSTEM - A computer program product, an apparatus, and a method for processing communications between a target and an initiator an input/output processing system are provided. The computer program product includes a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method. The method includes: sending a message from the initiator to the target, the message requesting suspension of input/output operations between the initiator and the target for a period of time, the period of time being defined by the message; responsive to the message, suspending input/output operation messages for the period of time; performing a system change comprising at least one of: at least one update, a computer program installation, a recovery, and a change in operating parameters; and initiating new input/output operations after at least one of: expiration of the period of time and initiation of new input/output operations by the initiator. | 08-20-2009 |
20100023801 | Method to recover from ungrouped logical path failures - A system and method for recovering from a single logical path failure. More specifically, although a host has not grouped its logical paths, the host knows which logical paths it has available. When a host detects a logical path failure, the host enters a path discovery mode of operation. If the host continues to detect a logical path failure while operating in the logical path discovery mode of operation, the host removes the logical path from a logical path mask, and the host does not use the removed logical path again. In the case of ungrouped logical paths, the host aborts its process because it does not have more paths available to continue its process. Additionally, in certain embodiments, a pseudo path group for ungrouped logical paths is created. | 01-28-2010 |
20100080117 | Method to Manage Path Failure Threshold Consensus - A system for providing hosts with a capability to determine which threshold rule of a plurality of threshold rules to use based upon threshold consensus. For example, the system would address a configuration case of several hosts sharing an output port of a fabric via zoning and that port being connected to a single port of a storage controller. If one host is executing lower priority jobs and its threshold is much higher than another host with higher priority jobs and a lower threshold, and the storage controller recognizes that several hosts are sharing the same storage controller port, the consensus will be to ignore the threshold of the first host and to use the threshold of the second host to prevent performance degradation in the system. | 04-01-2010 |
20100083061 | Method to Manage Path Failure Thresholds - A failure threshold host command that provides a host with the capability to tune a storage controller path failure threshold based on the host application performance requirements. The failure threshold host command comprises path failure threshold rules that the storage controller uses to determine when a CHPid has reached a failed state condition. | 04-01-2010 |
20120141115 | APPARATUS AND METHOD FOR CLEARING A FAULT CONDITION OVER A FIBRE CHANNEL PATH - A method for clearing a fault condition at a target device is disclosed herein. In selected embodiments, such a method includes detecting a fault condition at a target device and receiving N instructions before the fault condition is cleared, where the N instructions are unexecutable due to the fault condition. N fault condition indicators are transmitted in response to the N instructions. Clearing of the fault condition is detected when the fault condition no longer exists. Acknowledgments corresponding to the fault condition indicators are received, where each acknowledgment indicates that one of the fault condition indicators has been received. A fault clear indicator is transmitted only after both all N fault condition indicators have been received and clearing of the fault condition has been detected. A corresponding system and computer program product are also disclosed herein. | 06-07-2012 |
20120159003 | SYSTEMS AND METHODS FOR AVOIDING HOST LEVEL BUSY AND RETRY LATENCIES - In one embodiment, a system includes logic adapted for receiving a command from a first system, logic adapted for determining which resources are required to process the command, logic adapted for checking for the required resources before receiving data associated with the command, logic adapted for receiving the data from the first system, logic adapted for checking for the required resources after receiving the data when the checking for the required resources before receiving data indicated that the required resources were not available before receiving the data, logic adapted for sending a status to the first system if the required resources are not available after receiving the data, and logic adapted for processing the command if the required resources are available either before receiving the data or after receiving the data. In more embodiments, a method and computer program product for processing a command are also presented. | 06-21-2012 |
20130138833 | METHOD, APPARATUS AND SYSTEM TO DYNAMICALLY MANAGE LOGICAL PATH RESOURCES - System, apparatus, and methods for dynamically managing logical path resources are provided. The logical path resources are managed by adding, removing, and establishing logic paths based on specified priority schemes associated with the logical path resources. Information associated with the logical path resources is updated in a logical path resource table. | 05-30-2013 |
20130209086 | CLEARING A FAULT CONDITION OVER A FIBRE CHANNEL PATH - A method for clearing a fault condition at a target device is disclosed herein. In selected embodiments, such a method includes detecting a fault condition at a target device and receiving N instructions before the fault condition is cleared, where the N instructions are unexecutable due to the fault condition. N fault condition indicators are transmitted in response to the N instructions. Clearing of the fault condition is detected when the fault condition no longer exists. Acknowledgments corresponding to the fault condition indicators are received, where each acknowledgment indicates that one of the fault condition indicators has been received. A fault clear indicator is transmitted only after both all N fault condition indicators have been received and clearing of the fault condition has been detected. A corresponding system and computer program product are also disclosed herein. | 08-15-2013 |
20140053019 | REDUCED-IMPACT ERROR RECOVERY IN MULTI-CORE STORAGE-SYSTEM COMPONENTS - A method for recovering from an error in a multi-core storage-system component is disclosed. In one embodiment, such a method includes detecting an error in a first core of a multi-core component. The method determines whether the error was one of (1) detected by the first core; and (2) detected by a core other than the first core. In the event the error was detected by the first core and the error is recoverable, the first core recovers from the error without substantially impacting operation of other cores in the multi-core component. In the event the error was detected by a core other than the first core and the error is recoverable, a core other than the first core recovers from the error without substantially impacting operation of other cores in the multi-core component. A corresponding apparatus and computer program product are also disclosed. | 02-20-2014 |
20140101256 | METHOD TO PREVENT I/O STARVATION OF SLOWER HOSTS IN A MULTI-HOST ENVIRONMENT - A method, system and computer-usable medium are disclosed for managing storage control unit input/output (I/O) operations in a multi-host environment. A storage control unit sends a busy status message when it has exhausted its resources to process new I/O requests. Once the utilization of the storage control unit's resources has subsided to a predetermined upper utilization value, it sends a availability status message to a first predetermined number of host systems that are owed a availability statue message. After the first predetermined number of availability status messages are sent, the storage control unit then waits for a predetermined period of time before sending a second predetermined number of availability status messages. | 04-10-2014 |
Patent application number | Description | Published |
20080215741 | SYSTEM AND ARTICLE OF MANUFACTURE FOR ESTABLISHING AND REQUESTING STATUS ON A COMPUTATIONAL RESOURCE - Provided are a system and article of manufacture for establishing and requesting status on a computational resource. An operation is performed to establish a computational resource, wherein the computational resource is not available until the establish operation is completed. A determination is made as to whether a status request to determine status of the computational resource is pending before the establish operation has completed. Indication is made to resubmit the status request if there is a status request for the computational resource pending before the establish operation has completed. | 09-04-2008 |
20080263083 | SYNCHRONIZING LOGICAL SYSTEMS - A storage control unit detects a change in a configuration of a plurality of logical subsystems included in the storage control unit. The storage control unit sends a notification, wherein the notification indicates the change in the configuration of the plurality of logical subsystems. The storage control unit receives data transfer requests directed at available logical subsystems in the storage control unit, wherein the available logical subsystems are determined based on the configuration of the plurality of logical subsystems. | 10-23-2008 |
20090144464 | USAGE OF PERSISTENT INFORMATION UNIT PACING PROTOCOL IN FIBRE CHANNEL COMMUNICATIONS - Provided are a method, system, and article of manufacture, wherein a primary storage control unit receives an information unit from a remote host over a fibre channel connection, wherein persistent information unit pacing is implemented over the fibre channel connection. Information is maintained on how many large writes have been received at the primary storage control unit over at least one logical path established over the fibre channel connection between the primary storage control unit and the remote host, wherein a large write is an input/output (I/O) operation for which a number of data information units that are processed exceeds a default value of an information unit pacing credit. The primary storage control unit adjusts an information unit pacing parameter included in a response sent from the primary storage control unit to the remote host, wherein the adjusting is based at least on the information maintained on how many large writes have been received at the primary storage control unit over the at least one logical path. | 06-04-2009 |
20090319822 | APPARATUS AND METHOD TO MINIMIZE PERFORMANCE DEGRADATION DURING COMMUNICATION PATH FAILURE IN A DATA PROCESSING SYSTEM - A method to minimize performance degradation during communication path failure in a data processing system, comprising a host computer, a storage controller, and a plurality of physical communication paths in communication with the host computer and the storage controller, where the method establishes a. threshold communication path error rate, and determines an (i)th actual communication path error rate for an (i)th physical communication path, wherein that (i)th communication path is one of the plurality of physical communication paths. If the (i)th actual communication path error rate is greater than the threshold communication path error rate, the method discontinues use of the (i)th physical communication path. | 12-24-2009 |
20100023802 | Method to recover from logical path failures - A system and method for recovering from logical path failures is set forth. More specifically, when a host detects a logical path failure, the host enters a path discovery mode of operation. If the host continues to detect a logical path failure while operating in the logical path discovery mode of operation, the host removes the logical path from a logical path mask, and the host does not use the removed logical path again. Additionally, the system and method facilitates recovery of the failed logical paths by using a plurality of logical path masks. A first mask is referred to as an intermediate failure logical path mask and a second mask is referred to as a permanent failure logical path mask. | 01-28-2010 |
20100086077 | CONCURRENT ENABLEMENT OF PERSISTENT INFORMATION UNIT PACING - Provided are a method, system, and article of manufacture, in which a logical path is established between a control unit and a channel over a fibre channel connection. Code for persistent information unit pacing is loaded into the control unit and the channel. An indicator is set in node descriptors of the control unit and the channel to indicate concurrent enablement of persistent pacing while retaining the established logical path between the control unit and the channel. | 04-08-2010 |
Patent application number | Description | Published |
20120030599 | ENHANCED ZONING USER INTERFACE FOR COMPUTING ENVIRONMENTS - Exemplary method, system, and computer program embodiments for managing a computing environment are provided. In one embodiment, a plurality of information, including each of an available plurality of devices, an interconnected plurality of communication paths, and quality of service (QoS) information, is gathered for at least one of the available plurality of devices and the interconnected plurality of communication paths. The plurality of information is organized into a plurality of zones according to a zoning methodology. One of an available plurality of checking operations is performed to verify consistency of the plurality of information, including performing a real-time zone checking operation to determine that at least one of the plurality of zones is functional. The plurality of information, including the at least one of the plurality of zones, is displayed to the user via a graphical user interface (GUI). | 02-02-2012 |
20120039331 | STORAGE AREA NETWORK PATH MANAGEMENT - A path selection module selects at least two fibre channel paths between a fibre channel host and a fibre channel destination. A trace route module performs one or more fibre channel trace route procedures for each of the at least two fibre channel paths. The trace route module provides a set of fibre channel links between the fibre channel host and the fibre channel destination for each of the at least two fibre channel paths. A record registration module registers with one or more event servers to receive link incident records for the fibre channel links in the sets of fibre channel links. | 02-16-2012 |
20120151355 | DISCOVERY AND MANAGEMENT MECHANISM FOR SAN DEVICES - Exemplary method, system, and computer program embodiments for managing a network are provided. In one embodiment, at least one of an available plurality of network components is polled, including devices, hosts and virtual devices, an interconnected plurality of communication paths, and quality of service (QoS) information in a discovery process for network information. A graphical representation of the at least one of the available plurality of network components is created for presentation by a graphical user interface (GUI) to a user. Based on a selection of the user of at least one attribute of the at least one of the available plurality of network components as displayed by the GUI to the user, a zone is created for the at least one of the available plurality of network components. | 06-14-2012 |
20130159481 | BEST PRACTICES ANALYSIS OF ZONES AND COMPONENTS IN A NETWORK - Provided is a method for best practices analysis of zones and components in a network. A database has information on components in the network and configuration settings for the components. Best practices rules indicate best practices configuration settings for components in the network. The database and the accessed best practices rules are processed to determine whether the configuration settings for the components in the network satisfy the best practices configuration settings for the components indicated in the best practices rules. A report is generated indicating whether the configuration settings of the components in the network satisfy the best practices configuration settings for the components indicated in the best practices rules. | 06-20-2013 |
20140095679 | BEST PRACTICES ANALYSIS OF ZONES AND COMPONENTS IN A NETWORK - Provided is a method for best practices analysis of zones and components in a network. A database has information on components in the network and configuration settings for the components. Best practices rules indicate best practices configuration settings for components in the network. The database and the accessed best practices rules are processed to determine whether the configuration settings for the components in the network satisfy the best practices configuration settings for the components indicated in the best practices rules. A report is generated indicating whether the configuration settings of the components in the network satisfy the best practices configuration settings for the components indicated in the best practices rules. | 04-03-2014 |