摘要:
An external memory device subsystem and a data recording device, which issue a command specifying previously a plurality of tracks in a rotary type memory device prior to a read or write instruction issued from the data processing unit of higher rank to the rotary type memory device through a control unit; select continuously the plurality of tracks previously specified, at executing a read or write command after the execution of the command; and in this way can read/write continuously without wait time for rotation a plurality of tracks distant from each other within the same cylinder.
摘要:
Image track display apparatus including a memory for delaying an image signal by at least one vertical scanning period, a first subtraction circuit for taking a first difference signal between the image signal and its delayed image signal through the memory. The first difference signal includes first and second polarity components, a non-linear processing circuit for multiplying the one polarity component of the first difference signal by K times (0
摘要:
A virtualization system, upon judging that a write operation from a higher-level device is an operation to write in the format of the virtual volume, even when the write position of the write operation is in a virtual area different from a virtual area to which an allocated actual area has been allocated, if there is an unused area in the allocated actual area, writes management information to the unused area according to the write operation, and if there is no unused area in the allocated actual area, newly allocates an unallocated actual area, and writes management information to the newly allocated actual area according to the write operation.
摘要:
A controller unit for the storage apparatus executes the following: giving each data block, which is a data constituent unit, an identification number indicating that the relevant data has been sent from a host computer in response to an arbitrary write request from the host computer; storing, in a memory unit, a storage location in a hard disk drive unit to store the data, as well as the identification number, as an expected value, for the data to be stored in the hard disk drive unit; and in response to a read request from the host computer, comparing the identification number given to each data block, the constituent unit of the data read from the hard disk drive unit, with the expected value of the read data, thereby verifying that the read data is the data written to the hard disk drive in response to the arbitrary write request.
摘要:
A plurality of global LDEV managed by a plurality of controller modules are provided above local LDEV under the control of each controller module. Each global LDEV is correlated to any of the plurality of local LDEV. The controller modules judge whether or not a local LDEV correlated to a global LDEV specified by an I/O request received from a host device or a first other controller module is a management target itself, and if the result of that judgment is affirmative, the controller modules access the local LDEV correlated to the specified global LDEV, while if the result of the judgment is negative, the controller modules transfer the received I/O request to a second other controller module.
摘要:
A personal computer inputs path information for forming a path group and a storage controller manages the path group. For example, a physical path PS#1, a path PS#2 and a path PS#3 are defined as a path group PG#1 and instructed to the storage controller. This indication is stored in a table. Host A recognizes this path group information, too. Host A designates “Persistent Reserve OUT” on the path PS#1. The storage controller recognizes that the path group PG#1 inclusive of this path PS#1 is reserved as a whole. When Host B attempts release this reserve state illegally through a path PS#1 of Host A, Host B issues “Persistent Reserve OUT” command by KEY#1. Because the path PS#1 does not belong to the path group managed by the storage controller, however, the reserve release request is rejected.
摘要:
The value relating to the average of the length of processing time required to process a plurality of information sets is reduced. The information processing device comprises: a receiving component receiving information elements contained in respective information sets having one or more information elements, from one or a plurality of information set sources issuing the information sets; an information processing component carrying out processing of the information elements thus received; and a determining component determining a processing sequence for the two or more information sets or the plurality of information elements, on the basis of the plurality of information elements that are unprocessed or currently being processed, contained in two or more information sets thus received, and determining a processing sequence different from the reception sequence, in which a value relating to the average of the length of processing time for the two or more information sets becomes equal to or less than the value that would be obtained were the plurality of information elements or the two or more information sets to be processed in accordance with their reception sequence; the processing of a plurality of information elements that are unprocessed or currently being processed, being started on the basis of the processing sequence thus determined.
摘要:
A lining cloth of a woven fabric in which the warp yarn comprises either of polyester filamentary yarn or cellulosic filamentary yarn and the filling yarn comprises either a false-twisted polyester filamentary yarn, a raw filamentary yarn or a cellulosic filamentary yarn, characterized in that an elongation in the filling-wise direction of the woven fabric is in a range from 5% to 12%, a coefficient of dynamic friction on the surface of the woven fabric is in a range from 0.20 to 0.45, and a filling-wise crimp index value of the woven fabric as defined by the following formula (1) is in a range from 0.003 to 0.013: Crimp ratio of the filling yarn/{warp density×(warp fineness)1/2} (1) The lining cloth according to the present invention is soft in touch, excellent in slipperiness, resistant to seam slippage and free from wearing pressure. The lining cloth is suitably used as a lining for a skirt which is otherwise liable to ride up. The lining cloth according to the present invention is produced by heat-treating a grey fabric woven from warp yarns of polyester filament or cellulosic filament and filling yarns of raw polyester filament at a temperature in a range from 160° C. to 210° C. prior to or after the scouring while being narrowed in width by 5 to 30% relative to the grey fabric.
摘要:
In a magnetic disk controller equipped with a cache memory for disks, the controller in accordance with the present invention includes high order paths for data transfer between a high order channel apparatus and the cache memory through a certain one of a plurality of channel adaptors, low order paths for data transfer between a low order device, e.g. a magnetic disk device, and the cache memory through a certain one of a plurality of device adaptors and a path for data transfer betweeen the low order device and the channel cevice without passing through the cache memory by selecting empty device adaptor and channel adaptor by the switching operation of a switch. When an interrupt is generated from the device, data transfer can be made easily even when the high order path and the low order path are busy, and path utilization efficiency can be improved.
摘要:
A storage controller comprising a storage device adapter, a channel adapter, a cache memory, a control memory, and a plurality of buses connecting therebetween. The channel adapter communicates with a processor and processes input/output requests issued by the processor. The storage device adapter controls a storage device and data transfer between the storage device and the cache memory. The channel adapter and the storage device adapter exchanges control information via the control memory. The buses are used to transfer the data and the control information between the cache memory and the control memory, and the channel adapter and the storage device adapter. The controller also comprises bus load estimating means and bus mode selecting means. The bus load estimating means estimates bus load characteristics as an index based on the amount of data transfer during sequential access to the storage device. The bus mode selecting means determines a bus mode of bus utilization based on the index. Each of the channel adapter and the storage device adapter has bus access means for accessing the buses in accordance with the bus mode selected by the bus mode selecting means.