摘要:
According to one embodiment, a computer program product includes a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising: computer readable program code configured to receive a mount request to access at least one host data record on a virtual tape storage (VTS) system; computer readable program code configured to determine a number of host compressed data records per physical block on a magnetic tape medium; computer readable program code configured to determine a physical block ID (PBID) that corresponds to the requested at least one host data record; computer readable program code configured to access a physical block on the magnetic tape medium corresponding to the PBID; and computer readable program code configured to output the physical block without outputting an entire logical volume from the magnetic tape medium that the physical block is stored to. Other systems and computer program products are also described.
摘要:
In one embodiment, a virtual tape storage (VTS) system includes random access storage; sequential access storage; support for at least one virtual volume; a storage manager having logic for determining a physical block ID (PBID) that corresponds to a starting logical block ID (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.
摘要:
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.
摘要:
According to one embodiment, a method for accessing host data records stored on a VTS system includes receiving a mount request to access at least one host data record on a VTS system, determining a number of host compressed data records per physical block on a sequential access storage medium, determining a PBID that corresponds to the requested at least one host data record, accessing a physical block on the sequential access storage medium corresponding to the PBID, and outputting the physical block without outputting an entire logical volume that the physical block is stored to. In 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 performing the above described method. Other methods are also described.
摘要:
According to one embodiment, a method for accessing host data records stored on a VTS system includes receiving a mount request to access at least one host data record on a VTS system, determining a number of host compressed data records per physical block on a sequential access storage medium, determining a PBID that corresponds to the requested at least one host data record, accessing a physical block on the sequential access storage medium corresponding to the PBID, and outputting the physical block without outputting an entire logical volume that the physical block is stored to. In 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 performing the above described method. Other methods, systems, and computer program products are also described.
摘要:
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.
摘要:
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.
摘要:
An apparatus, system, and method are disclosed for selecting a source cluster in a distributed storage configuration. A measurement module measures system factors for a plurality of clusters over a plurality of instances. The clusters are in communication over a network and each cluster comprises at least one tape volume cache. A smoothing module applies a smoothing function to the system factors, wherein recent instances have higher weights. A lifespan module calculates a mount-to-dismount lifespan for each cluster from the smoothed system factors. A selection module selects a source cluster for accessing an instance of a specified volume in response to the mount-to-dismount lifespans and a user policy.
摘要:
A method to write information to two virtual tape servers. The method writes a file to a virtual host device disposed in a first virtual tape server, where the virtual host device comprises an adjustable bandwidth. The method queues a job to copy the file to a second virtual tape server, determines the age of the copy job, and copies that file to the second virtual tape server. The method sets an age threshold, and determines if the copy job age is greater than that age threshold. If the copy job age is greater than the age threshold, then the method decreases the adjustable bandwidth, if not, the method restores the adjustable bandwidth.
摘要:
A method to write information to two geographically separated virtual tape servers, where the method provides a file to a virtual tape controller, writes that file to a first virtual tape server, and queues a copy job for the file in the virtual tape controller. Subsequently, the method provides the file to a second virtual tape server. The method sets a throughput threshold, determines the actual VTC throughput, and determines if the actual VTC throughput exceeds the throughput threshold. The method sets an age threshold and determines if the copy job age is greater than that age threshold. If the actual VTC throughput is greater than the throughput threshold and the copy job age is greater than the age threshold, then the method decreases the first adjustable host bandwidth and/or the second adjustable host bandwidth, otherwise the method restores the bandwidth to a nominal value.