Christopher A Monahan

US Patent:

51595974, Oct 27, 1992

Filed:

May 21, 1990

Appl. No.:

7/525927

Inventors:

Christopher J. Monahan - Tucson AZ
Mary L. Monahan - Tucson AZ
Dennis L. Willson - Tucson AZ

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1100

US Classification:

371 161

Abstract:

An error recovery subsystem which can be easily modified for use with any physical hardware which is being monitored is disclosed. The error recovery subsystem employs a user editable file including the rules for defining the system state, the error states, and the sequences of recovery actions to be taken depending upon the comparison between the system state and the error states. The rules for defining the system state, include don't care variables, and the sequences of recovery actions are specified using an index into a set of elemental recovery actions. Because the system state, error state, and sequence of recovery actions are defined in a user editable file modifications to the error recovery scheme can be made without recompiling the error recovery subsystem program code. Such modifications to the error recovery subsystem may therefore be made on a real time basis. A method for recovering from an error and a program product therefore are also disclosed.

US Patent:

52396509, Aug 24, 1993

Filed:

May 21, 1990

Appl. No.:

7/526256

Inventors:

Joseph C. Hartung - Tucson AZ
Christopher J. Monahan - Tucson AZ
Jesse L. Thrall - Tucson AZ
Dennis L. Willson - Tucson AZ
Daniel J. Winarski - Tucson AZ

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1208

US Classification:

395650

Abstract:

A method for selecting data storage media for demount in an automated storage library, and an automated storage library and program product therefor are disclosed. Preemptive demount of storage media is permitted when all peripheral storage devices in the library are occupied and one or more of such devices remains inactive for a predetermined time. Storage media may be demounted to service existing mount requests, provide the peripheral storage devices in which the media are mounted are inactive. There is also a need, however, to ensure the availability of an empty device to service future mount requests, particularly in libraries having only a single gripper mechanism. Thus, even when no mount requests are pending, the status of the peripheral storage devices is continually monitored. If the peripheral storage devices are all occupied, and one or more of such devices remains inactive for the predetermined time, the least recently used storage medium is demounted and transferred to a storage cell in the library.

US Patent:

RE362867, Aug 31, 1999

Filed:

Aug 23, 1995

Appl. No.:

8/526818

Inventors:

Joseph Charles Hartung - Tucson AZ
Christopher John Monahan - Gainesville FL
Jesse Lee Thrall - Tucson AZ
Dennis Lee Willson - San Jose CA
Daniel James Winarski - Tucson AZ

Assignee:

International Business Machines - Armonk NY

International Classification:

G66F 1300

US Classification:

395828

Abstract:

A method for selecting data storage media for demount in an automated storage library, and an automated storage library and program product therefor are disclosed. Preemptive demount of storage media is permitted when all peripheral storage devices in the library are occupied and one or more of such devices remains inactive for a predetermined time. Storage media may be demounted to service existing mount requests, provided the peripheral storage devices in which the media are mounted are inactive. There is also a need, however, to ensure the availability of an empty device to service future mount requests, particularly in libraries having only a single gripper mechanism. Thus, even when no mount requests are pending, the status of the peripheral storage devices is continually monitored. If the peripheral storage devices are all occupied, and one or more of such devices remains inactive for the predetermined time, the least recently used storage medium is demounted and transferred to a storage cell in the library.

US Patent:

51214830, Jun 9, 1992

Filed:

May 21, 1990

Appl. No.:

7/525590

Inventors:

Christopher J. Monahan - Tucson AZ
Mary L. Monahan - Tucson AZ
Dennis L. Willson - Tucson AZ

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1300

US Classification:

395275

Abstract:

A method for servicing a mount request in an automated storage library in which all of the peripheral storage devices therein are occupied and which permits an active data storage medium to be temporarily demounted and subsequently remounted in any subsequently available peripheral storage device is disclosed. To service a mount request requiring that a data storage medium be demounted, the access information for the data storage medium to be demounted is first retained. After demounting and servicing of the mount request, the retained access information is used to permit remounting of the previously mounted data storage medium in any subsequently available peripheral storage device, thereby minimizing the risk of delay in remounting. The method also allows for optional parameters to prevent temporary demounting in an automated storage library, or to prevent temporary demounting of particular data storage media. An automated storage library and program product employing the method are also disclosed.

US Patent:

53882601, Feb 7, 1995

Filed:

Mar 5, 1993

Appl. No.:

8/027605

Inventors:

Christopher J. Monahan - Tucson AZ
Mary L. Monahan - Tucson AZ
Dennis L. Willson - Tucson AZ
Lee D. Willson - Tucson AZ

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1300

US Classification:

395600

Abstract:

An automated storage library for which the management thereof is transparent to a requester is disclosed. The library provides for all of its own internal management. To access a file in the library, a requester need only specify the volume on which the file is located, permitting the use of a standard file access method for a single peripheral storage device. A path format which is the same as that used for a single, peripheral storage device, except that the peripheral storage device designator is replaced with a designator for the automated storage library and a volume label is inserted as a subdirectory path element, and a program product therefor are also disclosed.

US Patent:

53865162, Jan 31, 1995

Filed:

Jun 19, 1992

Appl. No.:

7/902470

Inventors:

Christopher J. Monahan - Tucson AZ
Mary L. Monahan - Tucson AZ
Dennis L. Willson - Tucson AZ

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1300

US Classification:

395275

Abstract:

A method for servicing a mount request in an automated storage library in which all of the peripheral storage devices therein are occupied and which permits an active data storage medium to be temporarily demounted and subsequently remounted in any subsequently available peripheral storage device is disclosed. To service a mount request requiring that a data storage medium be demounted, the access information for the data storage medium to be demounted is first retained. After demounting and servicing of the mount request, the retained access information is used to permit remounting of the previously mounted data storage medium in any subsequently available peripheral storage device, thereby minimizing the risk of delay in remounting. The method also allows for optional parameters to prevent temporary demounting in an automated storage library, or to prevent temporary demounting of particular data storage media. An automated storage library and program product employing the method are also disclosed.