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Sidney R. Thompson

Bio: Sidney R. Thompson is an academic researcher. The author has contributed to research in topics: Mass storage & Magnetic tape data storage. The author has an hindex of 2, co-authored 2 publications receiving 412 citations.

Papers
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Patent
20 Jun 1994
TL;DR: In this article, an optical disk storage system emulates a magnetic tape subsystem by virtual addressing of data recorded on write once optical disk media having a predetermined group of available sectors for rewriting a disk ID, a predetermined plurality of bands of available sector for rewriting virtual tape directory to virtual tape VSNs, and available sectors with data portions for simulating tape marks and interblock gap and for addressing blocks of data within the virtual tapes.
Abstract: An optical disk storage system emulates a magnetic tape subsystem by virtual addressing of data recorded on write once optical disk media having a predetermined group of available sectors for rewriting a disk ID, a predetermined plurality of bands of available sectors for rewriting a virtual tape directory to virtual tape VSNs, and, available sectors for rewriting virtual tape maps and rewriting user records, the tape maps have data portions for simulating tape marks and interblock gap and for addressing blocks of data within the virtual tapes, the virtual tape directory has pointers for pointing to tape maps, and the system rewrites the tape directory, tape maps and user records so as to function as a rewritable magnetic tape.

276 citations

Patent
01 Jul 1994
TL;DR: In this article, an optical disk system emulating a 3480 magnetic tape subsystem having one or more magnetic tape drives, including a VMEGate channel attached processor for receiving CCW tape commands, includes a SCSI board for controlling SCSI optical disk drives, a serial I/O board for controlled jukebox optical disk media handlers for automatically robotically loading and unloading optical disks containing virtual tape data into the optical disk drive, a cache RAM for buffering data between the channel and the ODs, operator consoles for emulating the 3480 M tape subsystem control panels
Abstract: An optical disk system emulating a 3480 magnetic tape subsystem having one or more magnetic tape drives, includes a VMEGate channel attached processor for receiving CCW tape commands, a SCSI board for controlling SCSI optical disk drives, a serial I/O board for controlling jukebox optical disk media handlers for automatically robotically loading and unloading optical disks containing virtual tape data into the optical disk drives, a cache RAM for buffering data between the channel and the optical disk drives, operator consoles for emulating the 3480 magnetic tape subsystem control panels, an SBC computer and VME bus for central control of the system, and floppy and hard disk drives for storing emulation SBC programs and disk directories, to enable the system to exhibit an organization of virtual tape data into a system of pointers and user records of the virtual tapes, a reallocatable mapping between magnetic tape drives and the optical disk drives, disk directories cross referencing virtual tapes VSNs to optical disks for locating particular optical disks storing requested VSNs, and to enable WORM optical media to appear to the channel as rewritable magnetic tape through the conversion of tape commands to jukebox load operations and optical disk drive seek operations for increased performance, said system emulates a 3480 magnetic tape subsystem by using jukeboxes to automatically load optical media into and out of optical disk drives and by using a dynamic re-allocation method for maintaining a one-to-one mapping between the virtual magnetic tape drives and the optical disk drives, which reduces access speed to the data.

136 citations


Cited by
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Patent
20 Oct 1999
TL;DR: The Network Storage Manager (NSM) as discussed by the authors is a set of software components, the NSM controller contains a plurality of software elements including: Resource Allocation, Resource Configuration, Resource Management and Security Management modules.
Abstract: This data storage subsystem creates multiple virtual storage devices on demand, which are available to any and all of the system's host data processors. The subsystem utilizes a plurality of tape devices and automated tape libraries with the tape devices connected to a plurality of data processors via a high-speed network. A set of software components, the Network Storage Manager (NSM) controls all system operations. Depending upon the requested storage performance, one or more tape devices are assigned to a virtual device. Data stripping across multiple tape devices allows the storage bandwidth of a virtual device to be changed on demand. The overall capacity and performance of the subsystem is scalable by adding or removing storage devices. The NSM system controller contains a plurality of software elements including: Resource Allocation, Resource Configuration, Resource Management, and Security Management modules. The use of a networked storage manager enables the storage devices to be managed as a pool and yet be attached directly to the network as individual resources. The NSM also provides the mechanism for the enterprise management to control tape device allocation and configuration as well as other functions, such as tape cartridge movement, data migration and data security.

532 citations

Patent
18 Dec 2006
TL;DR: In this paper, the replicated data represents a known good state of the application, as determined by the consistency point entries, and the destination system(s) may perform a storage operation (e.g., snapshot, backup) to copy the replica data and to logically associate the copied data with a time information indicative of the source system time when the application was in the known good states.
Abstract: Performing data management operations on replicated data in a computer network. Log entries are generated for data management operations of an application executing on a source system. Consistency point entries are used to indicate a time of a known good, or recoverable, state of the application. A destination system is configured to process a copy of the log and consistency point entries to replicate data in a replication volume, the replicated data being a copy of the application data on the source system. When the replicated data represents a known good state of the application, as determined by the consistency point entries, the destination system(s) may perform a storage operation (e.g., snapshot, backup) to copy the replicated data and to logically associate the copied data with a time information (e.g., time stamp) indicative of the source system time when the application was in the known good state.

442 citations

Patent
13 Sep 2012
TL;DR: In this article, a modular computer storage system and method is provided for managing and directing data archiving functions, which is scalable and comprehends various storage media as well as diverse operating systems on a plurality of client devices.
Abstract: A modular computer storage system and method is provided for managing and directing data archiving functions, which is scalable and comprehends various storage media as well as diverse operating systems on a plurality of client devices. A client component is associated with one or more client devices for generating archival request. A file processor directs one or more storage devices, through one or more media components, which control the actual physical level backup on various storage devices. Each media component creates a library indexing system for locating stored data. A management component coordinates the archival functions between the various client components and the file processor, including setting scheduling policies, aging policies, index pruning policies, drive cleaning policies, configuration information, and keeping track of running and waiting jobs.

440 citations

Patent
03 May 2013
TL;DR: In this article, a system and method for performing storage operations relating to a first secondary copy of electronic data is described, where a storage policy or storage preferences may dictate that a replication copy should be used in storage operations performed to a particular client, sub-client, data, media or other item.
Abstract: A system and method are provided for performing storage operations relating to a first secondary copy of electronic data. A storage policy or storage preferences may dictate that a replication copy should be used in storage operations performed to a particular client, sub-client, data, media or other item. Based on the storage policy, when a new client, sub-client, data, media or other item is received, a media agent determines whether there is a replication copy of the item. In the absence of a replication copy, one may be created. The replication copy may be provided by a third party application, or created by the client or a storage management system component. Information regarding the replication copy and its corresponding first secondary copy may be stored in a database. To optimize use of system resources, storage operations relating to the first secondary copy may be performed using the replication copy instead of the first secondary copy.

401 citations

Patent
18 Dec 1997
TL;DR: In this paper, a system for modifying job control language (JCL) parameters optimizes data storage allocations for datasets by collecting historical data concerning actual data storage space requirements and use patterns for each dataset.
Abstract: A system for modifying job control language (JCL) parameters optimizes data storage allocations for datasets by collecting historical data concerning actual data storage space requirements and use patterns for each dataset. JCL statements are parsed to find references to datasets and their requested data storage space allocations. The system then generates revised JCL statements with revised space allocation requests and dataset migration information for each dataset based on historical space requirements and usage patterns. Optionally, the system can display each proposed change to the JCL statements for approval by the user. The system can also revise JCL statements requesting allocation of space for each dataset in predetermined data storage areas grouped by predetermined size ranges. Alternatively, some operating systems include a JCL interpreter that translates JCL statements into control blocks having predetermined parameter fields. The present invention can be implemented to process and revise these JCL control blocks instead of generating revised JCL statements.

346 citations