Storage system and method of remotely controlling the same

Details Storage system and method of remotely controlling the same Storage system and method of remotely controlling the same

1994-06-21

1996-10-01

Robertson, David L.

395550, 395494, G06F 104

Patent

active

055618251

ABSTRACT:
A storage system connected to host processors through data transfer paths includes at least one storage unit for moving a head for reading/writing the data relatively to a storage medium to read/write the data from/to the storage medium, and a controller for controlling the data transfer between the host processors and the storage units. The controller obtains and stores, every data transfer path, the information relating to the delay time which occurs when transferring the data through the data transfer path of interest. When an I/O request is issued from the host processor, in accordance with the measured information of the delay time in the data transfer paths, a request for positioning the head near the position on the storage medium in which the data is stored which is to be read/written is issued. In addition, when posting the release of the wait state to the host processors which had issued the I/O requests and are made wait the completion of the processings for other I/O requests, the order of issuing the notification is determined in accordance with the delay time in the data transfer paths which are permitted to be used in order to process the I/O requests.

REFERENCES:
patent: 4218759 (1980-08-01), Carlton et al.
"Nikkei Computer", published by Nikkei BP Co. Ltd., Sep. 24, 1990, pp. 57-58.
Hitachi Manual: HITAC H-6581-C3 Type Disc Driver, H-6587 Type Disc Driver, H-6586 Type Disc Driver, H-6585 Type Disc Driver, H-6598 Type Disc Driver, 8080-2-130-10, p. 138.

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