Remote copy control method, storage sub-system with the method, and large area data storage system using them
First Claim
1. A remote copy control method, for a storage sub-system which includes a control memory for storing control data, a cache memory for temporarily storing data, a micro processor for controlling said control memory and said cache memory, N transmission destinations for synchronously receiving said data from said micro processor, and M transmission destinations for asynchronously receiving said data from said microprocessor, said remote copy control method comprising:
- a first step of storing, in said control memory, transfer states/bit maps corresponding to said N+M data destinations;
a second step of another storage sub-system, which includes a transfer state/bit map that corresponds to one of said transfer states/bit maps, issuing to a storage sub-system that does not directly perform data transmission a command for transmitting an inquiry for a data update process state; and
a third step of, upon receiving a response to said command at said second step, updating said transfer states/bit maps.
2 Assignments
0 Petitions
Accused Products
Abstract
Two data centers located in the vicinity are connected using a synchronous transfer copy function, and one of the data centers is coupled with a third data center disposed at a remote location by an asynchronous remote copying function. The order whereat a storage sub-system located in the vicinity has received data from a host is consistently guaranteed, and the third data center holds the data. Further, each storage sub-system includes a function whereby, during normal operation, data can be exchanged and the data update state can be obtained by the storage sub-systems located in the two data centers that do not directly engage in data transmission.
104 Citations
5 Claims
-
1. A remote copy control method, for a storage sub-system which includes a control memory for storing control data, a cache memory for temporarily storing data, a micro processor for controlling said control memory and said cache memory, N transmission destinations for synchronously receiving said data from said micro processor, and M transmission destinations for asynchronously receiving said data from said microprocessor, said remote copy control method comprising:
-
a first step of storing, in said control memory, transfer states/bit maps corresponding to said N+M data destinations; a second step of another storage sub-system, which includes a transfer state/bit map that corresponds to one of said transfer states/bit maps, issuing to a storage sub-system that does not directly perform data transmission a command for transmitting an inquiry for a data update process state; and a third step of, upon receiving a response to said command at said second step, updating said transfer states/bit maps. - View Dependent Claims (2)
-
-
3. A storage sub-system, which includes a control memory for storing control data, a cache memory for temporarily storing data, a micro processor for controlling said control memory and said cache memory, a transmission destination for synchronously receiving said data from said micro processor and a transmission destination for asynchronously receiving said data from said microprocessor, comprising:
a function for issuing an inquiry for a data update process state of another storage sub-system that does not directly relate to data transmission. - View Dependent Claims (4, 5)
Specification