STORAGE SYSTEM, METHOD OF CONTROLLING STORAGE SYSTEM, AND METHOD OF CONTROLLING CONTROL APPARATUS

• US 20110010499A1
• Filed: 07/07/2010
• Published: 01/13/2011
• Est. Priority Date: 07/09/2009
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Hanaoka, Yuji, Haneda, Terumasa, Uchida, Atsushi, Tsukamoto, Nina, Kawano, Yoko
• Application Number:
  US12/831,515
• Publication Number:
  US 20110010499A1
• Time in Patent Office: Days
• US Class Current: 711/118
• CPC Class Codes: G06F 11/1441 Resetting or repowering
• CPC Class Codes: G06F 11/2015 Redundant power supplies power supply failure G06F1/30
• CPC Class Codes: G06F 12/0804 with main memory updating G06F12/0806 takes precedence
• CPC Class Codes: G06F 12/0866 for peripheral storage systems, e.g. disk cache

Abstract

A storage system including a storage, has a first power supplier for supplying electronic power, a second power supplier for supplying electronic power when the first power supplier not supplying electronic power to the storage system, a cache memory for storing data sent out from a host, a non-volatile memory for storing data stored in the cache memory, and a controller for writing the data stored in the cache memory into the non-volatile memory when the second supplier supplying electronic power to the storage system, for stopping the writing and for deleting data stored in the non-volatile memory so until a free space volume of the non-volatile memory being not less than a volume of the data stored in the cache memory when the first supplier restoring electronic power to the storage system.

Claims

1. A storage system including a storage for storing data comprising:

a first power supplier for supplying electronic power to the storage system;

a second power supplier for supplying electronic power to the storage system when the first power supplier not supplying electronic power to the storage system;

a cache memory for storing data sent out from a host;

a non-volatile memory for storing data stored in the cache memory; and

a controller for writing the data stored in the cache memory into the non-volatile memory when the second supplier supplying electronic power to the storage system, for stopping the writing and for deleting data stored in the non-volatile memory until a free space volume of the non-volatile memory being not less than a volume of the data stored in the cache memory when the first supplier restoring electronic power to the storage system.

2. The storage system of claim 1, wherein the controller determines that the free space volume of the non-volatile memory is not less than a volume of the data stored in the cache memory on the basis of the deleted volume of the non-volatile memory and a volume of the non-volatile memory which is not used for backup of cache data.

3. The storage system of claim 1, wherein the controller retains an address indicating where the data stored in the cache memory has written into the non-volatile memory.

4. The storage system of claim 3, wherein the controller writes the data stored in the cache memory into the non-volatile memory in accordance to the address.

5. A method of controlling a storage system including a storage for storing data;

the method comprising;

supplying electronic power to the storage system by a first power supplier, and a second power supplier when the first power supplier not supplying electronic power to the storage system;

storing data stored in the storage into a cache memory;

writing the data stored in the cache memory into a non-volatile memory when the second supplier supplying electronic power to the storage system;

stopping the writing; and

deleting data stored in the non-volatile memory so that a free space volume of the non-volatile memory is not less than a volume of the data stored in the cache memory when writing the data stored in the cache memory into the non-volatile memory and restoring electronic power to the storage system by the first supplier.

6. The method of claim 5, further comprising determining that the free space volume of the non-volatile memory is not less than a volume of the data stored in the cache memory on the basis of the deleted volume of the non-volatile memory and a volume of the non-volatile memory which is not used for backup of cache data.

7. The method of claim 5, further comprising retaining an address indicating where the data stored in the cache memory has written into the non-volatile memory.

8. The method of claim 7, wherein the writing writes the data stored in the cache memory into the non-volatile memory in accordance to the address.

9. A method of controlling a control apparatus being connectable to a storage for storing data, a cache memory for storing data stored in the storage, and a non-volatile memory for storing data stored in the cache memory, the method comprising:

writing the data stored in the cache memory into the non-volatile memory when a power failure being occurred;

stopping the writing; and

deleting data stored in the non-volatile memory so that a free space volume of the non-volatile memory is not less than a volume of the data stored in the cache memory when writing the data stored in the cache memory into the non-volatile memory and a supply of electric power being recovered.

10. The method of claim 9, further comprising determining that the free space volume of the non-volatile memory is not less than a volume of the data stored in the cache memory on the basis of the deleted volume of the non-volatile memory and a volume of the non-volatile memory which is not used for backup of cache data.

11. The method of claim 9, further comprising retaining an address indicating where the data stored in the cache memory has written into the non-volatile memory.

12. The method of claim 11, wherein the writing writes the data stored in the cache memory into the non-volatile memory in accordance to the address.