Patent application number | Description | Published |
20090193140 | SYSTEM AND METHOD FOR THROTTLING HOST THROUGHPUT - A method for throttling host throughput in a computer storage subsystem is provided. The host throughput is compared to a throughput limit for a predetermined time period. If the host throughput exceeds the throughput limit during the predetermined time period, an input/output (I/O) delay is set equal to the remainder of the predetermined time period, and the delay is implemented for an associated storage device of the computer storage subsystem. | 07-30-2009 |
20090327469 | Method for Controlling Host Throughput to a Computer Storage Subsystem - A method for controlling the throughput in a communications channel between a host and its storage subsystem is disclosed. A determination is made whether or not a total throughput value is greater than a predetermined maximum throughput value. If the total throughput value is greater than the predetermined maximum throughput value, a delay is applied to the communications channel. If the total throughput value is not greater than the predetermined maximum throughput value, another determination is made whether or not one time period has completed. If one time period has completed, a total throughput value and an exponential moving average (EMA) throughput value of the communications channel is retrieved, a new EMA throughput value is generated based on the total throughput value and the EMA throughput value, and adjusting the total throughput value based on whether or not the new throughput value is greater than a predetermined maximum throughput value. | 12-31-2009 |
20110107024 | EXTENDED LOGICAL WORM DATA INTEGRITY PROTECTION - A data storage system stores logical data object(s), each identified by a logical identifier. A control is configured to assign a unique WORM (Write Once Read Many) identifier to the logical data object, and stores the unique WORM identifier as associated with the logical identifier, in a database maintained by the control so as to be persistent. Data storage is configured to write the logical data object with a header with the unique WORM identifier. The control, in order to allow the logical data object to be accessed externally to the control, requires matching the unique WORM identifier in the header of a logical data object to the unique WORM identifier of the persistent database for the logical object. The unique WORM identifier is formed of a checksum hash value related to nonce fields comprising at least the logical identifier of the logical data object, an incrementing token, and a time stamp. | 05-05-2011 |
20110107045 | HYBRID STORAGE DATA MIGRATION BY SELECTIVE DATA REMOVAL - A hybrid data storage system is one which has data storage clusters of different types. In a hybrid data storage system, at least one first data storage cluster is configured to store data and has high data storage capacity; and at least one second data storage cluster is configured to store data and has lower data storage capacity than the first cluster. The data is initially replicated and stored by at least one first and at least one second data storage cluster. The method identifies a portion of the stored initially replicated data of at least one second data storage cluster as “pinned”; continues to store the pinned initially replicated data; and selectively removes non-pinned initially replicated data from the second data storage cluster(s) to account for the capacity difference. | 05-05-2011 |
20110107140 | SELECTIVE WRITE PROTECT FOR DISASTER RECOVERY TESTING - Various method, system, and computer program product embodiments for implementing selective write-protect by a processor in a data storage system within a plurality of redundant storage systems for disaster recovery testing are provided. In one such embodiment, a write-protect state is initiated within at least one of the plurality of redundant storage systems. An available plurality of categories, including at least one write-protect exclusion category, is configured within a management interface of the data storage system, such that during the disaster recovery testing a storage volume categorized in the write-protect exclusion category is excluded from write protection. | 05-05-2011 |
20110145517 | DYNAMIC REUSE AND RECONFIGURATION OF LOGICAL DATA OBJECTS IN A VIRTUAL TAPE SYSTEM - An embodiment of the invention comprises a virtual tape system supporting at least one Write Once Read Many (WORM) logical tape and at least one read-write logical tape, comprising a processor configured to a first task and/or a second task. The first task initializes a new logical data object from a single pool of at least two logical data objects, with the new logical data object bound with a member of a media type group consisting of a WORM data object or a read-write data object. The second task reuses one of the logical data objects without manual ejection and reinsertion. The reuse may include the processor configured to cycle the logical data object through a scratch pool as a selected scratch logical data object and mount the selected scratch logical data object with a write from beginning of tape command to bind at least one data attribute to the WORM data object. | 06-16-2011 |
20110276754 | PARTIAL VOLUME ACCESS IN A PHYSICAL STACKED VOLUME - In one embodiment, a VTS system includes a tape volume cache, a storage drive for interacting with sequential access storage media; logic for receiving a mount request to access host data record(s) stored on a storage medium, the mount request including a virtual volume identifier of a logical volume and a logical block identifier of the first requested host data record therein; logic for issuing a locate command to position the sequential access storage medium to about a physical block in the logical volume having at least a portion of the requested host data record(s) therein based on the virtual volume identifier and the logical block identifier; logic for creating and supporting a partial virtual volume in the tape volume cache; and logic for copying at least the physical block to the partial virtual volume. Other systems, methods, and computer program products are also described, according to other embodiments. | 11-10-2011 |
20110276756 | MAPPING LOCATIONS OF LOGICAL VOLUME RECORDS ON A PHYSICAL STACKED VOLUME - In one embodiment, a method for accessing host data records stored in a VTS system includes receiving a mount request to access at least one host data record, determining a SLBID corresponding to the requested host data records, determining a PBID that corresponds to the SLBID, accessing a physical block on a sequential access storage medium corresponding to the PBID, and outputting at least the physical block corresponding to the PBID without outputting an entire logical volume that the physical block is stored to. According to another embodiment, a VTS system includes random access storage, sequential access storage, support for at least one virtual volume, a storage manager having logic for determining a PBID that corresponds to a SLBID, and logic for copying a portion of a logical volume from the sequential access storage to the random access storage without copying the entire logical volume. Other embodiments are disclosed also. | 11-10-2011 |
20110320679 | OFFLOADING VOLUME SPACE RECLAMATION OPERATIONS TO VIRTUAL TAPE SYSTEMS - A method for offloading volume space reclamation operations to virtual tape systems is disclosed herein. In certain embodiments, such a method includes writing instruction information to a virtual tape system for use in performing a reclamation operation on a source virtual tape volume. The instruction information identifies the source virtual tape volume as well as valid objects in the source virtual tape volume. The virtual tape system then transforms the source virtual tape volume by retaining valid objects in the source virtual tape volume, removing invalid objects in the source virtual tape volume, and updating metadata associated with the source virtual tape volume to reflect changes made thereto. This generates an updated source virtual tape volume of reduced size. A corresponding computer program product and system are also disclosed and claimed herein. | 12-29-2011 |
20120239876 | MAPPING LOCATIONS OF LOGICAL VOLUME RECORDS ON A PHYSICAL STACKED VOLUME - In one embodiment, a method for accessing host data records stored in a VTS system includes receiving a mount request to access at least one host data record, determining a SLBID corresponding to the requested host data records, determining a PBID that corresponds to the SLBID, accessing a physical block on a sequential access storage medium corresponding to the PBID, and outputting at least the physical block corresponding to the PBID without outputting an entire logical volume that the physical block is stored to. According to another embodiment, a VTS system includes random access storage, sequential access storage, support for at least one virtual volume, a storage manager having logic for determining a PBID that corresponds to a SLBID, and logic for copying a portion of a logical volume from the sequential access storage to the random access storage without copying the entire logical volume. Other embodiments are disclosed also. | 09-20-2012 |
20120239891 | DYNAMIC REUSE AND RECONFIGURATION OF LOGICAL DATA OBJECTS IN A VIRTUAL TAPE SYSTEM - A method in one embodiment for operating a virtual server supporting at least one Write Once Read Many (WORM) logical data object and at least one read-write logical object includes initializing a logical data object from a common pool of the logical data objects, the logical data object bound with a member of a media type group, the member of the media type group comprising a WORM logical data object and a read-write logical data object; and reusing one of the logical data objects as the member of the media type group without ejection and reinsertion by mounting the logical data object with a write from beginning of logical data object to bind at least one data attribute to the member of the media type group to replace any previous attribute and data associated with the logical data object. | 09-20-2012 |
20120284467 | EXTENDED LOGICAL WORM DATA INTEGRITY PROTECTION WITH UNIQUE WORM IDENTIFIER IN HEADER AND DATABASE - A data storage system stores logical data object(s), each identified by a logical identifier. A control is configured to assign a unique WORM (Write Once Read Many) identifier to the logical data object, and stores the unique WORM identifier as associated with the logical identifier, in a database maintained by the control so as to be persistent. Data storage is configured to write the logical data object with a header with the unique WORM identifier. The control, in order to allow the logical data object to be accessed externally to the control, requires matching the unique WORM identifier in the header of a logical data object to the unique WORM identifier of the persistent database for the logical object. The unique WORM identifier is formed of a checksum hash value related to nonce fields comprising at least the logical identifier of the logical data object, and an incrementing token. | 11-08-2012 |
20130290625 | MAPPING LOCATIONS OF LOGICAL VOLUME RECORDS ON A PHYSICAL STACKED VOLUME - A system, method and computer program product for accessing host data records stored in a virtual tape storage (VTS) system. The computer program product includes a computer readable storage medium having computer readable program code embodied therewith. The computer readable program code includes computer readable program code configured to receive a mount request to access at least one host data record in a VTS system; computer readable program code configured to determine a starting logical block ID (SLBID) corresponding to the at least one requested host data record; computer readable program code configured to determine a physical block ID (PBID) that corresponds to the SLBID; computer readable program code configured to access a physical block on a magnetic tape medium corresponding to the PBID; and computer readable program code configured to output at least the physical block without outputting an entire logical volume that the physical block is stored to. | 10-31-2013 |
20140344540 | CLUSTER FAMILIES FOR CLUSTER SELECTION AND COOPERATIVE REPLICATION - Cluster families for cluster selection and cooperative replication are created. The clusters are grouped into family members of a cluster family base on their relationships and roles. Members of the cluster family determine which family member is in the best position to obtain replicated information and become cumulatively consistent within their cluster family. Once the cluster family becomes cumulatively consistent, the data is shared within the cluster family so that all copies within the cluster family are consistent. Each family member in the family replicates 1/Nth volumes and N represents a total number of cluster family members in the family. | 11-20-2014 |
20150089169 | DYNAMIC REUSE AND RECONFIGURATION OF LOGICAL DATA OBJECTS IN A VIRTUAL TAPE SYSTEM - A method according to one embodiment includes selecting, by a processor, one of a WORM logical data object and a read-write logical data object for reuse as a new WORM logical data object, said processor maintaining data attributes bound to said selected logical data object until it is determined that said selected logical data object is available for reuse. At least one temporary data attribute is assigned to said selected logical data object while maintaining said data attributes bound to said selected logical data object The selected logical data object is mounted and a write command to beginning of logical data object is received to bind at least one data attribute to said selected logical data object to replace data attributes and data associated with said selected logical data object to reuse said selected logical data object as said new WORM logical data object. | 03-26-2015 |