Operating a raw mirror within a RAID system

An electronic device, comprising:

• at least one processor, and
• at least one memory including computer program instructions, the at least one memory and the computer program instructions configured, with the processor, to cause the device to:
• configure a plurality of disks in a redundant array of independent disks (RAID) system as a raw mirror for storing configuration data of the RAID system;
• store metadata for the raw mirror in the plurality of disks, the metadata stored in each of the plurality of disks including:
• an identifier identifying that the disk belongs to the raw mirror, and
• a sequence number identifying a writing operation for a block storing the metadata in the disk;
• control reading and writing of the raw mirror based on the metadata;
• and
• create a raw mirror object for the raw mirror to manage the raw mirror, the raw mirror object including at least one of a block size of the raw mirror, an edge array pointing to the raw mirror, a RAID algorithm of the raw mirror, an access switch for the raw mirror, or a capacity of the raw mirror.

A computer program product for managing a redundant array of independent disks (RAID) system, the computer program product comprising:

• a non-transitory computer readable medium encoded with computer-executable program code for indicating the search result, wherein the code is configured to enable the execution of:
• configuring a plurality of disks in the RAID system as a raw mirror for storing configuration data of the RAID system;
• storing metadata for the raw mirror in the plurality of disks, the metadata stored in each of the plurality of disks including:
• an identifier identifying that the disk belongs to the raw mirror, and
• a sequence number identifying a writing operation for a block storing the metadata in the disk;
• controlling reading and writing of the raw mirror based on the metadata;
• and
• creating a raw mirror object for the raw mirror to manage the raw mirror, the raw mirror object including at least one of a block size of the raw mirror, an edge array pointing to the raw mirror, a RAID algorithm of the raw mirror, an access switch for the raw mirror, or a capacity of the raw mirror.

A method of managing a redundant array of independent disks (RAID) system, comprising:

• configuring a plurality of disks in the RAID system as a raw mirror for storing configuration data of the RAID system;
• storing metadata for the raw mirror in the plurality of disks, the metadata stored in each of the plurality of disks including:
• an identifier identifying that the disk belongs to the raw mirror, and
• a sequence number identifying a writing operation for a block storing the metadata in the disk;
• and
• controlling reading and writing of the raw mirror based on the metadata;
• wherein controlling reading and writing of the raw mirror based on the metadata comprises:
• checking the identifiers in the plurality of disks;
• comparing the sequence numbers of corresponding blocks of the plurality of disks;
• and
• reading the configuration data from the corresponding block of the disk with a maximum sequence number.

A method of managing a redundant array of independent disks (RAID) system, comprising:

• configuring a plurality of disks in the RAID system as a raw mirror for storing configuration data of the RAID system;
• storing metadata for the raw mirror in the plurality of disks, the metadata stored in each of the plurality of disks including:
• an identifier identifying that the disk belongs to the raw mirror, and
• a sequence number identifying a writing operation for a block storing the metadata in the disk;
• and
• controlling reading and writing of the raw mirror based on the metadata;
• in response to booting of the RAID system, obtaining the sequence numbers of corresponding blocks of the plurality of disks;
• comparing the sequence numbers of the corresponding blocks of the plurality of disks;
• and
• storing a maximum sequence number in a cache as the latest sequence numbers for the corresponding blocks.

An electronic device, comprising:

• at least one processor, and
• at least one memory including computer program instructions, the at least one memory and the computer program instructions configured, with the processor, to cause the device to:
• configure a plurality of disks in a redundant array of independent disks (RAID) system as a raw mirror for storing configuration data of the RAID system;
• store metadata for the raw mirror in the plurality of disks, the metadata stored in each of the plurality of disks including:
• an identifier identifying that the disk belongs to the raw mirror, and
• a sequence number identifying a writing operation for a block storing the metadata in the disk;
• and
• control reading and writing of the raw mirror based on the metadata;
• wherein the at least one memory and the computer program instructions are further configured, with the processor, to cause the device to control reading and writing of the raw mirror by:
• checking the identifiers in the plurality of disks;
• comparing the sequence numbers of corresponding blocks of the plurality of disks;
• and
• reading the configuration data from the corresponding block of the disk with the identifier and a maximum sequence number.

An electronic device, comprising:

• at least one processor, and
• at least one memory including computer program instructions, the at least one memory and the computer program instructions configured, with the processor, to cause the device to:
• configure a plurality of disks in a redundant array of independent disks (RAID) system as a raw mirror for storing configuration data of the RAID system;
• store metadata for the raw mirror in the plurality of disks, the metadata stored in each of the plurality of disks including:
• an identifier identifying that the disk belongs to the raw mirror, and
• a sequence number identifying a writing operation for a block storing the metadata in the disk;
• control reading and writing of the raw mirror based on the metadata;
• in response to booting of the RAID system, obtain the sequence numbers of corresponding blocks of the plurality of disks;
• compare the sequence numbers of the corresponding blocks of the plurality of disks;
• and
• store a maximum sequence number in a cache as the latest sequence numbers for the corresponding blocks.

A computer program product for managing a redundant array of independent disks (RAID) system, the computer program product comprising:

• a non-transitory computer readable medium encoded with computer-executable program code for indicating the search result, wherein the code is configured to enable the execution of:
• configuring a plurality of disks in the RAID system as a raw mirror for storing configuration data of the RAID system;
• storing metadata for the raw mirror in the plurality of disks, the metadata stored in each of the plurality of disks including:
• an identifier identifying that the disk belongs to the raw mirror, and
• a sequence number identifying a writing operation for a block storing the metadata in the disk;
• and
• controlling reading and writing of the raw mirror based on the metadata;
• wherein controlling reading and writing of the raw mirror based on the metadata comprises:
• checking the identifiers in the plurality of disks;
• comparing the sequence numbers of corresponding blocks of the plurality of disks;
• and
• reading the configuration data from the corresponding block of the disk with a maximum sequence number.

A computer program product for managing a redundant array of independent disks (RAID) system, the computer program product comprising:

• a non-transitory computer readable medium encoded with computer-executable program code for indicating the search result, wherein the code is configured to enable the execution of:
• configuring a plurality of disks in the RAID system as a raw mirror for storing configuration data of the RAID system;
• storing metadata for the raw mirror in the plurality of disks, the metadata stored in each of the plurality of disks including:
• an identifier identifying that the disk belongs to the raw mirror, and
• a sequence number identifying a writing operation for a block storing the metadata in the disk;
• controlling reading and writing of the raw mirror based on the metadata;
• in response to booting of the RAID system, obtaining the sequence numbers of corresponding blocks of the plurality of disks;
• comparing the sequence numbers of the corresponding blocks of the plurality of disks;
• and
• storing a maximum sequence number in a cache as the latest sequence numbers for the corresponding blocks.