International Business Machines Corporation

Hewlett-packard Development Company, L.p.

Novell, Inc.

Hewlett Packard Enterprise Development LP

Dinkar Sitaram

Asit Dan

Martin G Kienzle

William H Tetzlaff

Philip Shi-lung Yu

Satish Kumar Mopur

Kishore Kumar Muppirala

Kshitij Arun Doshi

Sumanesh Samanta

Ayman Abouelwafa

Viyyokaran Raman Ramachandran

Arif Abdulhusein Merchant

Mustafa Uysal

Rajiv R Ramaswami

Brent Tzion Hailpern

Junehwa Song

Nayyar P Shahabuddin

Dan Asit

Perwez Shahabuddin

A method generates input/output (IO) commands by plural different applications that execute on a host. The method prioritizes the applications by inserting different classifiers into the IO commands at a host bus adapter (HBA) located in the host. A storage device receives the IO commands and processes the IO commands according to priorities based on the classifiers for the applications.

Prioritizing input/outputs at a host bus adapter

Systems and methods for path selection for application commands are described. To this end, information associated with at least one application command that were processed at least one port of a target device is received. For a subsequent application command, a set of ports of the target device is determined. In one implementation, the set of ports is determined based on information associated with the subsequent application command. Once the set of ports is determined, the subsequent application command is directed to a port selected from the set of ports.

Path selection for application commands

The host interface module is configured to receive a plurality of I/O request which includes an associated priority; create an I/O request queue for each associated priority; define a threshold value for the queue length for each of the plurality of I/O request queues; and determine if the queue length for one of the plurality of the I/O request queue corresponding to the associated priority is less than the defined threshold value for the queue length for the one of the plurality of the I/O request queues. If the queue length of the one of the plurality of I/O request queues is more than the defined threshold value for the queue then the host interface module is further configured to rejecting the I/O request and sending a queue full message; wherein the threshold value for the queue length is based on the processing rate of the I/O requests in the plurality of the I/O request queues.

Managing I/O request in storage system

Two identity spaces form a federation by agreeing to use a secret key to facilitate secure access of resources between them. When one identity space receives a request for a resource from a user in the other identity space, the first identity space checks to see if the resource is protected. If the resource is protected, the first identity space requests that a mediator in the second identity space authenticate the external user. The mediator verifies the external user's authenticity. Once the external user is authenticated, the mediator securely informs the first identity space, using the secret key, that the external user is authenticated to access the resource. The identity space then grants the user access to the resource if the user is allowed access as per the access control policy of the identity space.

Cross domain authentication and security services using proxies for HTTP access

Under the present invention, a small cache is used for the selective buffering of devices of a heterogeneous striping group (i.e., striping group made of devices with unequal capacities) to match the load on each device to its capacity. The inventive caching algorithm utilizes a device map, or disk map, and applies a cache distribution factor for each device of a group to determined how to selectively buffer blocks read from different devices of a striping group; thereby placing different loads on the different devices of a striping group in accordance with their capacities.

Sieved caching for increasing data rate capacity of a heterogeneous striping group

A method and system for improving load balancing in a file server is disclosed. The method includes determining the existence of an overload condition on a storage device, the storage device having a plurality of retrieval streams accessing at least one file thereon; selecting a first retrieval stream reading a file; replicating a portion of said file being read by said first retrieval stream onto a second storage device; and reading the replicated portion of said file on said second storage device with a retrieval stream capable of accessing the replicated portion of said file. The method and system enables the dynamic replication of data objects to respond to fluctuating user demand. The method and system is particularly useful in file servers such as multimedia servers delivering continuously in real time large multimedia files such as movies.

Method and system for load balancing by replicating a portion of a file being read by a first stream onto second device and reading portion with a second stream capable of accessing

Fileserver buffers are managed so as to improve the hit ratio for read accesses to the fileserver by clients by grouping related files into filesets, collecting fileserver access operation (i.e., read and write) statistics for each of the filesets, classifying the filesets into a plurality of fileset categories having similar collected access operation statistics and then implementing different fileserver buffer management policies for the blocks (or pages) from each of the different fileset categories. The buffer management policy applied to each of these categories is designed to create a generally higher preference for retaining blocks (or pages) of files in the fileserver buffers having a generally higher read to write ratio.

Fileserver buffer manager based on file access operation statistics

A system and method for use in a distributed video-on-demand system of a type wherein at least one node provides blocks of video data to clients and wherein at least some of the blocks of video data are replicated on multiple nodes. Observed response characteristics for other nodes are recorded at least a given one of the nodes which serves a client requesting a replicated block. The given one of the nodes also records response characteristics reported to it by the other nodes. The node from which to fetch the replicated data block is selected based on which nodes include a copy of the replicated data block and based on at least one of the observed response characteristics and the reported response characteristics.

Recording observed and reported response characteristics at server

The functionality of Web clients (e.g. browser) is enhanced using a WebFilter Manager (WFM) that allows i) easy integration of individual WebFilters operating on ingoing or outgoing messages between the browser and web servers, ii) arbitrary and dynamic ordering of WebFilters operating on a message stream, iii) splitting, combining, modifying and processing of message streams by WebFilters. The same methodology can also be applied in any client server environment for extending the functionality of the client or server.

System for providing custom functionality to client systems by

A form of authentication is provided wherein a trusted third party signs a certificate to identify the author of a program and to secure its integrity. The program code is encapsulated or otherwise associated with the certificate and an access control list (ACL). The access control list describes the permissions and resources required by the code. An enforcement mechanism which allocates system permissions and resources in accordance with the ACL. In a preferred embodiment, a code production system communicates with a certification agency, which is a trusted third party. The certification agency issues a certificate for the code and a certificate for the access list of that code. Once the certificate is issued it is not possible for any party to modify the code or access list without invalidating the certificate. The code and its ACL, along with their certificates are stored on a server. A client downloading the code or access list can verify the integrity of the code/access list and the system can enforce the access list such that the permissions and resources are not exceeded.

Support for portable trusted software

A video server is provided with buffer manager which balances the loads on the various 'movie storage' elements of a video server by preferentially buffering streams on highly loaded storage elements. The allocation of buffer takes place only when the storage element load increases due to the arrival of a new request or when buffer becomes available due to the pausing or stopping of an old request.

Load balancing in servers by allocating buffer to streams with

System for load balancing by replicating portion of file while being

A system and method for caching sequential data streams in a cache storage device. For each information stream, a determination is made as to whether its data blocks should discarded from cache as they are read by a consuming process. Responsive to a determination that the data blocks of a stream should be discarded from the cache are read by the consuming process, the data blocks associated with that stream are cached in accordance with an interval caching algorithm. Alternatively, responsive to a determination that the data blocks of a stream should not be discarded from the cache storage device as they are read by the consuming process, the data blocks of that stream are cached in accordance with a segment caching algorithm.

Disk caching system for selectively providing interval caching or

A system and method for scheduling the number of channels in video-on-demand servers so as to deal with time varying load. The scheduling process is hierarchical. A higher level scheduler controls the rate of channel consumption based on anticipated load, and a lower level scheduler selects the waiting client requests to be served when a channel is allocated by the higher level scheduler.

Growing community of inventors

Yorktown Heights, NY, United States of America

Dinkar Sitaram