Interface error detection and isolation in a direct access stora

Details Interface error detection and isolation in a direct access stora Interface error detection and isolation in a direct access stora

1997-12-22

2000-04-18

Robertson, David L.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

G06F 1300

Patent

active

060527587

ABSTRACT:
Disclosed is a system for isolating errors in a remote copy system. A first controller writes data to a volume in a first direct access storage device (DASD) and maintains a copy of the data in a cache. The first controller transfers the data in the cache to a host system via a first communication line. The host system then transfers the data transferred from the first controller to a second controller via a second communication line. The second controller writes the data transferred from the host system to a volume in a second DASD. A volume pair is comprised of a volume in the first DASD and a volume in the second DASD, wherein for each volume pair, the second DASD volume backs-up data stored in the first DASD volume. If an error related to a volume pair is detected, then the operation of transferring the data in the cache for the volume pair related to the error to the second controller via the host system is suspended. Information on the detected error is written to a first data set. Further, after the transfer of data from the cache is suspended, information on a location of data written to the first DASD volume in the volume pair related to the error is written to a second data set. The information in the second data set is used to determine the location of data written to the first DASD volume of the volume pair related to the error while the transfer of the data to the second DASD volume of the volume pair is suspended. Upon correction of the error related to the volume pair, data written to the first DASD volume at the determined location is transferred to the second storage controller via the host system for storage in the second DASD volume of the volume pair.

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IBM Corporation Manual, DFSMS/MVS Version 1, "Remote Copy Administrator's Guide and Reference", 1994, 1996 (entire document).
IBM Corporation, Internet article, http://www.storage.ibm.com/storage/software/sms/remcopy.htm, "DFSMS/MVS: Remote Copy", 1996 (entire document).
IBM Corporation, Internet article, http://www.storage.ibm.com/storage/software/sms/sysmngd.htm, 1996 (entire document).

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