Data recovery method, system, and apparatus in storage system

Abstract

Embodiments of the present disclosure provide a data recovery method in a storage system. A solid state disk is divided into a plurality of fault domains, and each fault domain is used to provide a physical address for a specific range of logical addresses of an SSD, so that when a fault domain of the solid state disk is faulty, it is unnecessary to reconstruct data in the entire SSD.

What is claimed is: 
     
         1 . A data recovery method in a storage system, wherein the storage system comprises a controller, a first solid state disk (SSD), and a second SSD; the first SSD and the second SSD each comprise a plurality of fault domains; the storage system comprises a chunk group that is formed based on an erasure code (EC) algorithm, and the chunk group comprises a first chunk in the first SSD and a second chunk in the second SSD; an address of the first chunk is mapped to a physical address provided by a first fault domain of the first SSD, and an address of the second chunk is mapped to a physical address provided by a second fault domain of the second SSD; and
 the method comprises:   receiving, by the controller, fault information of the first SSD, wherein the fault information indicates that the first fault domain is faulty; and   in response to receiving the fault information, recovering, by the controller based on the erasure code algorithm, data stored at the address of the first chunk in the chunk group.   
     
     
         2 . The method according to  claim 1 , wherein one fault domain in each of the first SSD and the second SSD is a plurality of die packages connected on one channel. 
     
     
         3 . The method according to  claim 1 , wherein one fault domain in each of the first SSD and the second SSD is one or more die packages. 
     
     
         4 . The method according to  claim 1 , wherein one fault domain in each of the first SSD and the second SSD is one or more dies. 
     
     
         5 . The method according to  claim 1 , wherein one fault domain in each of the first SSD and the second SSD is one or more flash memory planes. 
     
     
         6 . The method according to  claim 1 , wherein the storage system stores a correspondence between the first fault domain and the chunk group and a correspondence between the second fault domain and the chunk group. 
     
     
         7 . The method according to  claim 6 , further comprising, in response to receiving the fault information, querying, by the controller, the correspondence between the first fault domain and the chunk group to determine the chunk group. 
     
     
         8 . The method according to  claim 1 , wherein the storage system stores a correspondence between the address of the first chunk and the first fault domain and a correspondence between the address of the second chunk and the second fault domain. 
     
     
         9 . A storage system, wherein the storage system comprises a controller, a first solid state disk (SSD), and a second SSD; the first SSD and the second SSD each comprise a plurality of fault domains, the storage system comprises a chunk group that is formed based on an erasure code (EC) algorithm, and the chunk group comprises a first chunk in the first SSD and a second chunk in the second SSD; an address of the first chunk is mapped to a physical address provided by a first fault domain of the first SSD, and an address of the second chunk is mapped to a physical address provided by a second fault domain of the second SSD; and
 the controller is configured to:   receive fault information of the first SSD, wherein the fault information is used to indicate that the first fault domain is faulty; and   in response to receiving the fault information, recover, based on the erasure code algorithm, data stored at the address of the first chunk in the chunk group.   
     
     
         10 . The storage system according to  claim 9 , wherein the storage system stores a correspondence between the first fault domain and the chunk group and a correspondence between the second fault domain and the chunk group; and
 the controller is further configured to query the correspondence between the first fault domain and the chunk group to determine the chunk group in response to receiving the fault information.   
     
     
         11 . The storage system according to  claim 9 , wherein one fault domain in each of the first SSD and the second SSD is a plurality of die packages connected on one channel. 
     
     
         12 . The storage system according to  claim 9 , wherein one fault domain in each of the first SSD and the second SSD is one or more die packages. 
     
     
         13 . The storage system according to  claim 9 , wherein one fault domain in each of the first SSD and the second SSD is one or more dies. 
     
     
         14 . The storage system according to  claim 9 , wherein one fault domain in each of the first SSD and the second SSD is one or more flash memory planes.