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公开(公告)号：EP0795862A3
公开(公告)日：1999-01-20
申请号：EP97301511.8
申请日：1997-03-06
发明人： Basham, Robert Beverly , Dahman, Kirby Grant , Fry, Scott Milton , Johnson, Steven Douglas , Wilson, Steven Bennett
IPC分类号： G11B20/12
CPC分类号： G11B5/584 , G11B5/00813 , G11B5/00817 , G11B15/087 , G11B20/1202 , G11B27/107 , G11B27/322 , G11B27/328 , G11B2220/90 , G11B2220/95
摘要： various data storage formats help to efficiently locate, read, and write user data stored on magnetic tape media. A tape is formatted by writing multiple segment-headers, free from any interleaved access of user data. Adjacent segment-headers are spaced by a predetermined interval to define multiple data storage segments. Segment-headers all contain a unique key, which is copied into a key index to identify valid segments. After formatting, normal tape accesses can be performed. Without erasing any old headers or data, a new formatting scheme can be established by writing new segment-headers on the tape. The new segment-headers include a new unique key, replacing the previous key in the key index. Previous segment-headers stored on the tape are ignored, since they lack the updated key. Segments may be selectively grouped to provide independently addressable partitions. Mapping between segments and partitions can use a fixed relationship (e.g. one-to-one), or each partition may be variably sized according to the amount of data to be stored therein. Variable-sized partitions may be automatically padded with a selected number of empty segments. Another feature is flexible-capacity scaling, which distributes an ordered set of device blocks on a multi-track magnetic tape medium. The device blocks are bi-directionally stored in a continuous configuration of multiple adjacent stacked serpentine patterns occupying some or all of the tape. This configuration permits sequential access of all device blocks without advancing the tape medium to skip over regions between adjacent device blocks.
摘要翻译： 各种数据存储格式有助于有效地定位，读取和写入存储在磁带介质上的用户数据。 通过写入多个段头来格式化磁带，而不用交织访问用户数据。 相邻段标题间隔预定间隔以定义多个数据存储段。 段头包含一个唯一的密钥，该密钥被复制到密钥索引中以识别有效的段。 格式化后，可以执行正常的磁带访问。 在不擦除任何旧的标题或数据的情况下，可以通过在磁带上写入新的段标题来建立新的格式化方案。 新的段标题包含一个新的唯一键，取代键索引中的前一个键。 存储在磁带上的以前的段标题会被忽略，因为它们缺少更新的密钥。 分段可以选择性地分组以提供可独立寻址的分区。 段和分区之间的映射可以使用固定的关系（例如，一对一），或者每个分区可以根据要存储在其中的数据量而可变地调整大小。 可变大小的分区可以自动填充选定数量的空段。 另一个功能是灵活容量缩放，它将一组有序的设备块分布在多磁道磁带介质上。 装置块被双向存储在占据一些或全部磁带的多个相邻堆叠蛇形图案的连续配置中。 此配置允许顺序访问所有设备块，而不会使磁带介质超前跳过相邻设备块之间的区域。
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3.发明公开Combining small records into a single record block for recording on a record media 失效捆绑在一个数据块的短记录用于记录在记录介质上。
公开(公告)号：EP0406188A1
公开(公告)日：1991-01-02
申请号：EP90850194.3
申请日：1990-05-21
发明人： Dunn, Edwin Charles , Fry, Scott Milton , Jackson, Scott Arie , MaClean, Neil Hector, Jr. , Reynolds, Richard Porter , Ripberger, Richard Anthony
IPC分类号： G11B20/12
CPC分类号： G06F3/0601 , G06F2003/0697 , G11B20/1262 , G11B2020/1087 , G11B2020/10879
摘要： Information bearing signals are recorded in one of a plurality of record formats on one record medium, such as a magnetic tape, magnetic disk, optical disk, and the like. The format selected may be commanded or based upon record lengths, in bytes. When the record length equals or exceeds a predetermined number of bytes, then one record is recorded in each signal block of the record format. When the record length is less than the predetermined number, then a second format is used which inserts several of the records in one of the signal blocks. The signal block and its packets respectively contain indications of formats such that any one of several formats may be used on one record medium and in one signal block having a plurality of variable length packets. Logical indicators, such as format marks, tape marks, and the like, may separate formats used on the storage medium.
摘要翻译： 信息承载信号被记录在记录格式中的一种记录介质，颜色上的多个中的一种：诸如磁带，磁盘，光盘等。 选择的格式可以被命令或基于记录长度，以字节为单位。 当记录长度等于或超过预定的字节数，则一个记录被记录在记录格式的每个信号块。 当记录长度小于所述预定数目，则第二格式用于其中在信号块中的一个插入几个记录。 信号块和它的数据包分别包含格式调查的指示所做的几种格式的任何一个可以具有可变长度的数据包的多个一种记录介质上，并且在一个信号块中使用。 逻辑指标,:如格式标记，磁带标记等，可以分离在存储介质上使用的格式。
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公开(公告)号：EP0059829A2
公开(公告)日：1982-09-15
申请号：EP82100346.4
申请日：1982-01-19
CPC分类号： G06F12/123 , G06F12/0862 , G06F12/0866 , G06F13/122
摘要： A data transfer storage system includes host processors (12) which act as utilization devices, a peripheral subsystem (10) having a buffer (15) with buffer segments and devices (13), which act as data source-sinks.
Data transfers between respective buffer segments and data source-sinks, such as peripheral data storage devices are scheduled as a series of transfers based upon most recent, next most recent, etc. usage of the buffer segments by a utilization device. An "MRU-LRU" list of segments ordered by such usage is dynamically maintained. Replacement of segment allocations among devices proceeds from the least recent used, next least recent used, etc. segments. Therefore, the single list controls replacement, read ahead (prefetch) of data from devices to the buffer and transfer of data from the buffer to the devices all based on utilization of the buffer by the utilization device.摘要翻译： 数据传输存储系统包括用作利用装置的主机处理器（12），具有缓冲器段的缓冲器（15）的外围子系统（10）和用作数据源汇的装置（13）。 ...各个缓冲区段和诸如外围数据存储设备的数据源 - 宿之间的数据传输被调度为基于利用设备的最新的，下一个最新的等待使用缓冲区段的一系列传送 。 通过这种使用排序的片段的“MRU-LRU”列表被动态地保持。 设备中的段分配的替换从最近使用的，最近使用的最近使用的等等段进行。 因此，单个列表控制从设备到缓冲区的数据的替换，预取（预取）数据，以及数据从缓冲区到设备的所有基于利用设备的缓冲区的利用。
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5.发明公开Method and system for balancing workloads among control units 失效Verfahren und System zum Ausgleich der Arbeitslast zwischen verschiedenen Steuereinheiten。
公开(公告)号：EP0059828A2
公开(公告)日：1982-09-15
申请号：EP82100345.6
申请日：1982-01-19
IPC分类号： G06F15/16
CPC分类号： G06F9/5083 , G06F9/505 , G06F13/122 , G06F2209/5022
摘要： Data processing apparatus includes a plurality of host processors (12) connected by channels (14) to control units (11) including buffer memories (15) segemented to receive work allocations for peripheral devices (13).
Data processing workloads are balanced between the control units, based upon tallies of data processing delays. The workloads are arranged in work allocations, such as assignment of peripheral devices to a control unit. A separate delay tally is kept for each work allocation along with a summation of all delays in each control unit. When a tally threshold in any data processing unit is exceeded, load balance is examined. Upon a predetermined imbalance, a work allocation having a delay tally equal to a mean value of the different delay summations is transferred to a data processing unit having a lower delay summation.摘要翻译： 基于数据处理延迟的数据，在诸如外围系统的控制单元的多个数据处理单元之间平衡数据处理工作量。 工作负载被布置在工作分配中，例如将外围设备分配给控制单元; 对于每个工作分配，保持单独的延迟计数以及每个控制单元中的所有延迟的总和。 当超过任何数据处理单元的计数阈值时，检查负载平衡。 在预定的不平衡之后，具有等于不同延迟求和的平均值的延迟总和的工作分配被传送到具有较低延迟求和的数据处理单元。
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公开(公告)号：EP0978835A3
公开(公告)日：2004-10-20
申请号：EP99306064.9
申请日：1999-07-30
CPC分类号： G11B23/08714 , G11B15/07 , G11B15/67544 , G11B15/6835 , G11B23/042 , G11B23/107 , G11B27/002 , G11B27/11 , G11B2020/10768 , G11B2220/41 , G11B2220/655 , G11B2220/95
摘要： Disclosed is a data storage system for use with a tape cartridge storing data in a serpentine pattern on tape media, and having a memory device for storing a device block map for the tape media. A tape drive, or a loading mechanism, first positions the tape cartridge at memory interface for transferring the device block map from the memory device to a processor, and subsequently positions the tape media for reading and/or writing. The processor processes the device block map from the memory device for optimal retrieval of the serpentine pattern data of the tape media. The processing of the device block map occurs while the tape media is positioned for reading and/or writing, so that the processor begins the retrieval reading process immediately upon the positioning of the tape media. In another aspect of the invention, a robotic accessor of an automated data storage library moves the tape cartridge to the tape drive. The tape cartridge is positioned at the memory interface on the robotic accessor, and the stored device block map is transferred from the memory device to the processor, during the move.
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公开(公告)号：EP0795861A2
公开(公告)日：1997-09-17
申请号：EP97301478.0
申请日：1997-03-05
IPC分类号： G11B20/12
CPC分类号： G11B20/1205 , G11B7/003 , G11B7/007 , G11B9/06 , G11B15/68 , G11B23/107 , G11B27/3027 , G11B27/328
摘要： A storage device controller that records user data in a plurality of equal-sized partitions in parallel linear tracks and records tape format information in a protected region at one end of a track and thereby defines an unused area across all the remaining storage media tracks in which user data is not recorded, provides a user accessible supplemental storage area by storing user data in one or more of the unused areas.
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公开(公告)号：EP0153553A2
公开(公告)日：1985-09-04
申请号：EP85100106.5
申请日：1985-01-11
CPC分类号： G06F12/08
摘要： A peripheral data storage system employing a data buffer connected to a plurality of data storage devices, such as tape recorders, dynamically reallocates data buffer storage segments among the various data storage devices. A normalized elapsed-time period is established based upon the number of accesses to the data storage devices. When the number of accesses reaches a threshold the need for dynamic reallocation is examined. During the elapsed-time period the system monitors which of the allocated buffer segments have any data transfer activity at all and also measures the intensity of the activity for the respective buffer segments. In a peripheral system, the intensity is indicated by the number of channel command retries submitted to a connected host processor for the respective allocated buffer segment. Based upon the allocation status of the buffer segments and intensity of activities of the respective buffer segments, the buffer allocations are selectively reallocated among the data storage devices.
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公开(公告)号：EP0795862A2
公开(公告)日：1997-09-17
申请号：EP97301511.8
申请日：1997-03-06
发明人： Basham, Robert Beverly , Dahman, Kirby Grant , Fry, Scott Milton , Johnson, Steven Douglas , Wilson, Steven Bennett
IPC分类号： G11B20/12
CPC分类号： G11B5/584 , G11B5/00813 , G11B5/00817 , G11B15/087 , G11B20/1202 , G11B27/107 , G11B27/322 , G11B27/328 , G11B2220/90 , G11B2220/95
摘要： various data storage formats help to efficiently locate, read, and write user data stored on magnetic tape media. A tape is formatted by writing multiple segment-headers, free from any interleaved access of user data. Adjacent segment-headers are spaced by a predetermined interval to define multiple data storage segments. Segment-headers all contain a unique key, which is copied into a key index to identify valid segments. After formatting, normal tape accesses can be performed. Without erasing any old headers or data, a new formatting scheme can be established by writing new segment-headers on the tape. The new segment-headers include a new unique key, replacing the previous key in the key index. Previous segment-headers stored on the tape are ignored, since they lack the updated key. Segments may be selectively grouped to provide independently addressable partitions. Mapping between segments and partitions can use a fixed relationship (e.g. one-to-one), or each partition may be variably sized according to the amount of data to be stored therein. Variable-sized partitions may be automatically padded with a selected number of empty segments. Another feature is flexible-capacity scaling, which distributes an ordered set of device blocks on a multi-track magnetic tape medium. The device blocks are bi-directionally stored in a continuous configuration of multiple adjacent stacked serpentine patterns occupying some or all of the tape. This configuration permits sequential access of all device blocks without advancing the tape medium to skip over regions between adjacent device blocks.
摘要翻译： 各种数据存储格式有助于有效地定位，读取和写入存储在磁带介质上的用户数据。 通过写入多个段头来格式化磁带，没有用户数据的任何交错访问。 相邻的段报头间隔预定间隔以定义多个数据存储段。 段头都包含唯一的密钥，它被复制到密钥索引中以标识有效的段。 格式化后，可以执行正常的磁带访问。 在不擦除任何旧标头或数据的情况下，可以通过在磁带上写入新的段头来建立新的格式化方案。 新的分段标题包括一个新的唯一键，替换键索引中的以前的键。 存储在磁带上的以前的段头将被忽略，因为它们缺少更新的密钥。 分段可以被选择性地分组以提供独立的可寻址分区。 段和分区之间的映射可以使用固定关系（例如一对一），或者每个分区可以根据要存储在其中的数据量而变化大小。 可以使用选定数量的空段自动填充可变大小的分区。 另一个特征是灵活容量缩放，其在多轨磁带介质上分配一组有序的设备块。 设备块被双向存储在占据某些或全部磁带的多个相邻堆叠蛇形图案的连续配置中。 该配置允许所有设备块的顺序访问，而不需要前进磁带介质跳过相邻设备块之间的区域。
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公开(公告)号：EP0153553A3
公开(公告)日：1989-06-07
申请号：EP85100106.5
申请日：1985-01-11
CPC分类号： G06F12/08
摘要： A peripheral data storage system employing a data buffer connected to a plurality of data storage devices, such as tape recorders, dynamically reallocates data buffer storage segments among the various data storage devices. A normalized elapsed-time period is established based upon the number of accesses to the data storage devices. When the number of accesses reaches a threshold the need for dynamic reallocation is examined. During the elapsed-time period the system monitors which of the allocated buffer segments have any data transfer activity at all and also measures the intensity of the activity for the respective buffer segments. In a peripheral system, the intensity is indicated by the number of channel command retries submitted to a connected host processor for the respective allocated buffer segment. Based upon the allocation status of the buffer segments and intensity of activities of the respective buffer segments, the buffer allocations are selectively reallocated among the data storage devices.
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