公开(公告)号：JPH10105467A

公开(公告)日：1998-04-24

申请号：JP8617197

申请日：1997-04-04

Applicant: SYMBIOS LOGIC INC

Inventor： DEKONING RODNEY A ,  HUMLICEK DONALD R ,  JOHNSON MAX L

IPC: G06F3/06 ,  G06F11/20 ,  G06F12/08 ,  G06F12/16 ,  G11C29/00

Abstract: PROBLEM TO BE SOLVED: To secure the consistency of a cache memory in the redundant pair of RAID(redundant array of inexpensive disk) controllers. SOLUTION: The redundant RAID controllers are initialized in reponse to a power-on reset cycle, etc. The first controller 118.1 partially executes initialization for the processing of the request of a host and, after that, waits the partial initialization of the second controller 118.2. After the short time-out the waiting time or in response to the misoperation of the initialization, the first controller constitutes itself so as to execute the I/O request of host computer while bypassing a cache operation till the second controller is substantially initialized. When both the controllers are initialized, the redundant caches are synchronized. After that, the initialized controllers start a normal mirror-type redundant operation.

公开(公告)号：AU5522898A

公开(公告)日：1999-06-28

申请号：AU5522898

申请日：1997-12-10

Applicant: SYMBIOS LOGIC INC

Inventor： DEKONING RODNEY A ,  GATES DENNIS E ,  BINFORD CHARLES D

IPC: G06F11/10

公开(公告)号：EP0784273A3

公开(公告)日：1998-09-30

申请号：EP96309316

申请日：1996-12-19

Applicant: SYMBIOS LOGIC INC

Inventor： DEKONING RODNEY A ,  HUMLICEK DONALD R

IPC: G06F12/16 ,  G06F3/06 ,  G06F11/20 ,  G06F12/00 ,  G11B20/18 ,  G06F11/14

CPC classification number: G06F11/2082 ,  G11B20/1833

Abstract: The invention provides for a method and apparatus for the rapid generation of a snapshot copy of the data stored in a RAID storage subsystem (100). In addition to the user's configured RAID logical units (110), the present invention provides for the definition within a RAID controller (102) of a logical RAID level-one device (104) having an operational half (106) comprising the user's defined logical unit(s) and having a non-operational mirror component (108). The user access data is stored on the RAID subsystem by direct access to the user's defined logical unit and when a user directs a snapshot copy request to the operational half (106) and user defined logical units (110), the RAID controller (102) responds by temporarily configuring available storage capacity (e.g. spare disk drives) in the RAID subsystem to perform the function of the non-operational mirror component (108) of the logical RAID level-one device (104). Restoring operation of the non-operational mirror component (108) further causes the RAID controller (102) to rebuild the content of the restored mirror component by copying the content of the user's configured device(s) to the temporary replacement mirror component (124). Following completion of the rebuild operation, the logical RAID level-one device (104) is restored to the status of having a non-operational mirror component (108). The data copied to the temporarily reconfigured available storage capacity is then returned to the user requesting the snapshot data for further processing as, for example, backup.