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Применить Всего найдено 7. Отображено 7.
20-09-2012 дата публикации

METHODS FOR MANAGING A CACHE IN A MULTI-NODE VIRTUAL TAPE CONTROLLER

Номер: US20120239878A1
Автор: Beeston Ralph T., Dawson Erika M., Lee Duke A., Luciani David, Lyman Joel K.
Принадлежит: INTERNATIONAL BUSINESS MACHINES CORPORATION

According to one embodiment, a method for managing cache space in a virtual tape controller includes receiving data from at least one host using the virtual tape controller; storing data received from the at least one host to a cache using the virtual tape controller; sending a first alert to the at least one host when a cache free space size is less than a first threshold and entering into a warning state using the virtual tape controller; sending a second alert to the at least one host when the cache free space size is less than a second threshold and entering into a critical state using the virtual tape controller; and allowing previously mounted virtual drives to continue normal writing activity when in the critical state. 1. A method for managing cache space in a virtual tape controller , the method comprising:receiving data from at least one host using the virtual tape controller;storing data received from the at least one host to a cache using the virtual tape controller;sending a first alert to the at least one host when a cache free space size is less than a first threshold and entering into a warning state using the virtual tape controller;sending a second alert to the at least one host when the cache free space size is less than a second threshold and entering into a critical state using the virtual tape controller; andallowing previously mounted virtual drives to continue normal writing activity when in the critical state.2. The method as recited in claim 1 , further comprising monitoring the cache free space size at least once every ten seconds when in the warning state.3. The method as recited in claim 1 , further comprising monitoring the cache free space size at least once every two seconds when in the critical state.4. The method as recited in claim 1 , further comprising rejecting new write requests on private mount virtual drives when in the critical state.5. The method as recited in claim 1 , further comprising failing new scratch mount requests ...

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Номер записи: 1
30-01-2014 дата публикации

SYNCHRONOUS MODE REPLICATION TO MULTIPLE CLUSTERS

Номер: US20140032957A1
Автор: Beeston Ralph T., Dawson Erika M., Johnson Gavin S., KATORI Katsuyoshi, SWINGLER Joseph M.
Принадлежит: INTERNATIONAL BUSINESS MACHINES CORPORATION

Provided are a computer program product, system, and method for synchronous mode replication to multiple clusters receiving a write to a volume from a host. A received write is cached in a memory. A determination is made of a replication rule indicating one of a plurality of replication modes for a first cluster and a second cluster used for replication for the write, wherein one of the replication modes comprises a synchronous mode. A determination is made that the replication rule indicates a synchronous mode for the first and the second clusters. The write is transmitted from the memory to the first cluster to store in a first non-volatile storage of the first cluster and to the second cluster to store in a second non-volatile storage in response to determining that the replication rule indicates the synchronous mode. 1. A computer program product for replicating data from a host to at least a first cluster and second cluster , the computer program product comprising a computer readable storage medium having computer readable program code embodied therein that executes to perform operations , the operations comprising:receiving a write to a volume from a host;caching the received write in a memory;determining a replication rule indicating one of a plurality of replication modes for the first cluster and the second cluster used for replication for the write, wherein one of the replication modes comprises a synchronous mode;determining that the replication rule indicates a synchronous mode for the first and the second clusters; andtransmitting the write from the memory to the first cluster to store in a first non-volatile storage of the first cluster and to the second cluster to store in a second non-volatile storage in response to determining that the replication rule indicates the synchronous mode.2. The computer program product of claim 1 , wherein the operations further comprise:initiating a synchronization operation to synchronize writes in response to a host ...

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Номер записи: 2
08-01-2015 дата публикации

MANAGING A CACHE IN A MULTI-NODE VIRTUAL TAPE CONTROLLER

Номер: US20150012700A1
Автор: Beeston Ralph T., Dawson Erika M., Lee Duke A., Luciani David, Lyman Joel K.
Принадлежит:

According to one embodiment, a system includes a virtual tape library having a cache, a virtual tape controller (VTC) coupled to the virtual tape library, and an interface for coupling multiple hosts to the VTC. The cache is shared by the multiple hosts, and a common view of a cache state, a virtual library state, and a number of write requests pending is provided to the hosts by the VTC. In another embodiment, a method includes receiving data from at least one host using a VTC, storing data received from all the hosts to a cache using the VTC, sending an alert to all the hosts when free space is low and entering into a warning state, sending another alert to all the hosts when free space is critically low and entering into a critical state while allowing previously mounted virtual drives to continue normally. 1. A system , comprising:a virtual tape library having a cache;at least one virtual tape controller coupled to the virtual tape library; andan interface for coupling at least two hosts to the at least one virtual tape controller,wherein the cache is shared by the at least two hosts, andwherein a common view of a cache state, a virtual library state, and a number of write requests pending is provided to the at least two hosts by the virtual tape controller.2. The system as recited in claim 1 ,wherein the at least one virtual tape controller enters into a warning state and provides a first alert to the at least one host when a cache free space size is less than a first threshold, andwherein the at least one virtual tape controller enters into a critical state and provides a second alert to the at least one host when a cache free space size is less than a second threshold.3. The system as recited in claim 2 , wherein the at least one virtual tape controller allows previously mounted virtual drives to continue normal writing activity when in the critical state.4. The system as recited in claim 2 , wherein the at least one virtual tape controller throttles write ...

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Номер записи: 3
17-09-2015 дата публикации

MANAGING A CACHE IN A MULTI-NODE VIRTUAL TAPE CONTROLLER

Номер: US20150261680A1
Автор: Beeston Ralph T., Dawson Erika M., Lee Duke A., Luciani David, Lyman Joel K.
Принадлежит:

A method according to one embodiment includes outputting a first alert when a cache free space size is less than a first threshold and entering into a warning state, and outputting a second alert when the cache free space size is less than a second threshold and entering into a critical state. At least one scratch volume is deleted when in the critical state, the scratch volume chosen based on at least one of: a length of time the scratch volume has been designated scratch, a priority level of the information stored on the scratch volume, and a scratch delay value associated with the scratch volume. 1. A computer program product for managing cache space , the computer program product comprising a computer readable storage medium having program instructions embodied therewith , the program instructions executable by a controller to cause the controller to perform a method comprising:storing data received from at least one host to a cache;outputting a first alert when a cache free space size is less than a first threshold and entering into a warning state;outputting a second alert when the cache free space size is less than a second threshold and entering into a critical state;allowing previously mounted virtual drives to continue normal writing activity when in the critical state; anddeleting at least one scratch volume when in the critical state, the scratch volume being chosen based on at least one of: a length of time the scratch volume has been designated scratch, a priority level of the information stored on the scratch volume, and a scratch delay value associated with the scratch volume.2. The computer program product as recited in claim 1 , comprising program instructions executable by the controller to cause the controller to monitor the cache free space size at least periodically when in the warning state.3. The computer program product as recited in claim 1 , comprising program instructions executable by the controller to cause the controller to monitor the ...

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Номер записи: 4
19-05-2015 дата публикации

Methods for managing a cache in a multi-node virtual tape controller

Номер: US9037802B2
Автор: David Luciani, Duke A. Lee, Erika M. Dawson, Joel K. Lyman, Ralph T. Beeston
Принадлежит: International Business Machines Corp

According to one embodiment, a method for managing cache space in a virtual tape controller includes receiving data from at least one host using the virtual tape controller; storing data received from the at least one host to a cache using the virtual tape controller; sending a first alert to the at least one host when a cache free space size is less than a first threshold and entering into a warning state using the virtual tape controller; sending a second alert to the at least one host when the cache free space size is less than a second threshold and entering into a critical state using the virtual tape controller; and allowing previously mounted virtual drives to continue normal writing activity when in the critical state.

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Номер записи: 5
29-05-2008 дата публикации

Transfer of Application Loggin Status Information Across Subsystem Nodes

Номер: US20080126469A1
Автор: Daniel J. Winarski, Henry Z. Liu, Joseph W. Dain, Ralph T. Beeston, Thomas W. Bish
Принадлежит: International Business Machines Corp

In a system including an application subsystem node having an application RSID table and a logging subsystem node having a logging RSID table, the application subsystem node makes a determination of a registration status of a ALSI string relative to the application RSID table during a logging operation of the ALSI string. The application subsystem node further transfers a RSID package from the application subsystem node across a network to the logging subsystem node, wherein the RSID package includes a RSID encoding of the ALSI string and conditionally includes the ALSI string based on the registration status of the ALIS string relative to the application RSID table as determined by the application subsystem node.

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Номер записи: 6
21-06-2016 дата публикации

Managing a cache in a multi-node virtual tape controller

Номер: US09372801B2
Автор: David Luciani, Duke A. Lee, Erika M. Dawson, Joel K. Lyman, Ralph T. Beeston
Принадлежит: International Business Machines Corp

A method according to one embodiment includes outputting a first alert when a cache free space size is less than a first threshold and entering into a warning state, and outputting a second alert when the cache free space size is less than a second threshold and entering into a critical state. At least one scratch volume is deleted when in the critical state, the scratch volume chosen based on at least one of: a length of time the scratch volume has been designated scratch, a priority level of the information stored on the scratch volume, and a scratch delay value associated with the scratch volume.

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Номер записи: 7