System for storing and managing plural logical volumes in each of
several physical volumes including automatically creating logical
volumes in peripheral data storage subsystem
    1.
    发明授权
    System for storing and managing plural logical volumes in each of several physical volumes including automatically creating logical volumes in peripheral data storage subsystem 失效
    用于存储和管理多个物理卷中的每一个中的多个逻辑卷的系统,包括在外围数据存储子系统中自动创建逻辑卷

    公开(公告)号:US5546557A

    公开(公告)日:1996-08-13

    申请号:US75936

    申请日:1993-06-14

    CPC分类号: G06F3/0601 G06F2003/0698

    摘要: A peripheral data storage subsystem has means for responding to a MOUNT command received from a host processor to create and mount a host-processor-addressable logical data-storage volume. Such logical data-storage volume has a serial number VOLSER indicated in the MOUNT command. The logical data volume is assigned a predetermined area of a physical data volume, such area being termed a partition. The illustrated embodiment shows a tape subsystem in which the partitions are accessed by a control using a reel tachometer that identifies segments of the tape. Each partition has a number of the tape segments. Controls and methods are described for initializing the subsystem for effecting the automatic volume creation, appending data into a logical volume, how logical volumes are made to be portable, moving logical volumes amongst diverse physical media, tape formats usable for such logical volumes, data base control of the logical volumes and volume creation processing. The physical volume in which one or more logical volumes reside is not host-processor addressable. Some physical volumes are ejectable from the data storage subsystem. The physical volumes storing the logical volumes are not ejectable. To eject a logical volume, it is copied from the storing physical volume to an ejectable physical volume.

    摘要翻译: 外围数据存储子系统具有用于响应从主机处理器接收的MOUNT命令来创建和安装主机处理器可寻址逻辑数据存储卷的装置。 这种逻辑数据存储卷具有MOUNT命令中指示的序列号VOLSER。 逻辑数据卷被分配了物理数据卷的预定区域,这样的区域被称为分区。 所示实施例示出了磁带子系统,其中通过使用标识磁带的段的卷轴转速计的控制来访问分区。 每个分区都有多个磁带段。 描述了用于初始化子系统以实现自动卷创建,将数据附加到逻辑卷中的逻辑卷和方法,如何使逻辑卷可移植,在各种物理介质之间移动逻辑卷,可用于此类逻辑卷的磁带格式,数据库 控制逻辑卷和卷创建处理。 一个或多个逻辑卷所在的物理卷不是主机处理器可寻址的。 一些物理卷可从数据存储子系统弹出。 存储逻辑卷的物理卷不可弹出。 要弹出逻辑卷,将从存储物理卷复制到可弹出的物理卷。

    Adaptive data transfer channel employing extended data block capability
    2.
    发明授权
    Adaptive data transfer channel employing extended data block capability 失效
    采用扩展数据块功能的自适应数据传输通道

    公开(公告)号:US5517670A

    公开(公告)日:1996-05-14

    申请号:US998971

    申请日:1992-12-30

    IPC分类号: G06F13/38 G06F13/00

    CPC分类号: G06F13/385

    摘要: An adaptive data transfer channel providing means for a data management access method (AM) to define the channel subsystem data block transfer size and to transfer an extended data block (EDB) by a single channel transfer command to avoid repeated channel command word (CCW) command decode and status presentation operations. The adaptive scheme of this invention is transparent to the user and downwardly compatible with existing data record storage formats because it is independent of the user application program. The host software in the central processing complex (CPC) tests the peripheral data storage device (PDSD) to ensure compatibility with the EDB CCWs before selecting the channel program (CP) to be used for data block transfer in the subchannel. In the EDB format, the PDSD microcode permits the accumulation of logical data blocks (LDBs) from storage to form a single large EDB before transfer to the CPC responsive to a single transfer command. Conversely, the CPC can transfer a single EDB to the PDSD where it is parsed to form data records in an existing data record storage format, thus ensuring complete downward compatibility with existing data record storage formats.

    摘要翻译: 一种用于数据管理访问方法(AM)的自适应数据传输信道提供装置,用于定义信道子系统数据块传输大小并通过单个信道传送命令传送扩展数据块(EDB),以避免重复的信道命令字(CCW) 命令解码和状态显示操作。 本发明的自适应方案对于用户是透明的,并且与现有数据记录存储格式向下兼容,因为它独立于用户应用程序。 在中央处理复合体(CPC)中的主机软件测试外围数据存储设备(PDSD)以确保与EDB CCW的兼容性,然后选择用于在子信道中进行数据块传输的通道程序(CP)。 在EDB格式中,PDSD微码允许在存储之前积累来自存储器的逻辑数据块(LDB),以在响应于单个传送命令传送到CPC之前形成单个大的EDB。 相反,CPC可以将单个EDB传输到已解析的PDSD,以形成现有数据记录存储格式的数据记录,从而确保与现有数据记录存储格式完全向下兼容。

    Extension of data block capability in a data transfer channel
    3.
    发明授权
    Extension of data block capability in a data transfer channel 失效
    在数据传输通道中扩展数据块功能

    公开(公告)号:US5539918A

    公开(公告)日:1996-07-23

    申请号:US451878

    申请日:1995-05-26

    IPC分类号: G06F13/38 G06F13/00

    CPC分类号: G06F13/385

    摘要: An adaptive data transfer channel providing means for a data management access method (AM) to define the channel subsystem data block transfer size and to transfer an extended data block (EDB) by a single channel transfer command to avoid repeated channel command word (CCW) command decode and status presentation operations. The adaptive scheme of this invention is transparent to the user and downwardly compatible with existing data record storage formats because it is independent of the user application program. The host software in the central processing complex (CPC) tests the peripheral data storage device (PDSD) to ensure compatibility with the EDB CCWs before selecting the channel program (CP) to be used for data block transfer in the subchannel. In the EDB format, the PDSD microcode permits the accumulation of logical data blocks (LDBs) from storage to form a single large EDB before transfer to the CPC responsive to a single transfer command. Conversely, the CPC can transfer a single EDB to the PDSD where it is parsed to form data records in an existing data record storage format, thus ensuring complete downward compatibility with existing data record storage formats.

    摘要翻译: 一种用于数据管理访问方法(AM)的自适应数据传输信道提供装置,用于定义信道子系统数据块传输大小并通过单个信道传送命令传送扩展数据块(EDB),以避免重复的信道命令字(CCW) 命令解码和状态显示操作。 本发明的自适应方案对于用户是透明的,并且与现有数据记录存储格式向下兼容,因为它独立于用户应用程序。 在中央处理复合体(CPC)中的主机软件测试外围数据存储设备(PDSD)以确保与EDB CCW的兼容性,然后选择用于在子信道中进行数据块传输的通道程序(CP)。 在EDB格式中,PDSD微码允许在存储之前积累来自存储器的逻辑数据块(LDB),以在响应于单个传送命令传送到CPC之前形成单个大的EDB。 相反,CPC可以将单个EDB传输到已解析的PDSD,以形成现有数据记录存储格式的数据记录,从而确保与现有数据记录存储格式完全向下兼容。