Method for processing input/output (I/O) requests of a RAID system having a protection pool of storage units
A method, apparatus, and system for processing Redundant Array of Independent Disks (RAID) Input/Output (I/O) requests for a plurality of nodes in a cluster is disclosed. A file system request including a byte offset is received. Then, a Physical Extent (PE) row that matches the file system request and a RAID stripe within the identified PE row based on the byte offset is identified. Next, a plurality of RAID I/O requests to be routed to a physical disk is generated. Each of the plurality of the RAID I/O requests includes information associated with the PE and a type of operation. Thereafter, each of the RAID I/O requests is processed based on the information associated with the PE and the type of operation.
1. A computer-implemented method for processing Redundant Array of Independent Disks (RAID) Input/Output (I/O) requests for a plurality of nodes in a cluster, comprising:
receiving a file system request including a byte offset;
identifying a Physical Extent (PE) row that matches the file system request and a RAID stripe within the identified PE row based on the byte offset;
generating a plurality of RAID I/O requests to be routed to a physical disk, wherein each of the plurality of the RAID I/O requests comprises information associated with the PE and a type of operation; and
processing each of the RAID I/O requests based on the information associated with the PE and the type of operation, comprising:
identifying a node to receive the plurality of the RAID I/O requests;
locating disk objects using a PE universally unique identifier (UUID) comprising a Local Disk Manager (LDM) UUID and a disk UUID;
generating a PE base sector offset by shifting the PE UUID by a predefined number of bits;
issuing a read I/O request to the disk objects based on the PE base sector offset for a processing; and
returning data to the identified node.
2. The method of claim 1 , wherein the information associated with the PE comprises a PE UUID identifying a PE location, a stripe offset within the PE, and a data buffer.
3. The method of claim 1 , wherein the processing of each of the RAID I/O requests further comprises:
adding the generated PE base sector offset to the PE stripe offset.
4. The method of claim 3 further comprising:
identifying the node to receive the plurality of the RAID I/O requests and write data;
issuing a write I/O request to the disk objects for a processing; and
returning an I/O completion status to the identified node.
5. The method of claim 3 , wherein the data is provided to the file system once all of the plurality of the RAID I/O requests are processed.
6. The method of claim 4 , wherein the I/O completion status is transmitted to the file system once all of the plurality of the RAID I/O requests are processed.
7. The method of claim 1 , wherein the type of operation comprises a read or write operation.
8. A non-transitory machine-readable medium having instructions stored therein, which when executed by a processor, cause the processor to perform operations of processing Redundant Array of Independent Disks (RAID) Input/Output (I/O) requests for a plurality of nodes in a cluster, the operations comprising:
receiving a file system request including a byte offset;
identifying a Physical Extent (PE) row that matches the file system request and a RAID stripe within the identified PE row based on the byte offset;
generating a plurality of RAID I/O requests to be routed to a physical disk, wherein each of the plurality of the RAID I/O requests comprises information associated with the PE and a type of operation; and
processing each of the RAID I/O requests based on the information associated with the PE and the type of operation, comprising:
identifying a node to receive the plurality of the RAID I/O requests;
locating disk objects using a PE universally unique identifier (UUID) comprising a Local Disk Manager (LDM) UUID and a disk UUID;
generating a PE base sector offset by shifting the PE UUID by a predefined number of bits;
issuing a read I/O request to the disk objects based on the PE base sector offset for a processing; and
returning data to the identified node.
9. The machine-readable medium of claim 8 , wherein the information associated with the PE comprises a PE UUID identifying a PE location, a stripe offset within the PE, and a data buffer.
10. The machine-readable medium of claim 8 , wherein the processing of each of the RAID I/O requests further comprises:
adding the generated PE base sector offset to the PE stripe offset.
11. The machine-readable medium of claim 10 , wherein the operations further comprise:
identifying the node to receive the plurality of the RAID I/O requests and write data;
issuing a write I/O request to the disk objects for a processing; and
returning an I/O completion status to the identified node.
12. The machine-readable medium of claim 10 , wherein the data is provided to the file system once all of the plurality of the RAID I/O requests are processed.
13. The machine-readable medium of claim 11 , wherein the I/O completion status is transmitted to the file system once all of the plurality of the RAID I/O requests are processed.
14. The machine-readable medium of claim 8 , wherein the type of operation comprises a read or write operation.
15. A data processing system, comprising:
a processor; and
a memory to store instructions, which when executed by the processor, cause the processor to perform operations of processing Redundant Array of Independent Disks (RAID) Input/Output (I/O) requests for a plurality of nodes in a cluster, the operations including:
receiving a file system request including a byte offset;
identifying a Physical Extent (PE) row that matches the file system request and a RAID stripe within the identified PE row based on the byte offset;
generating a plurality of RAID I/O requests to be routed to a physical disk, wherein each of the plurality of the RAID I/O requests comprises information associated with the PE and a type of operation; and
processing each of the RAID I/O requests based on the information associated with the PE and the type of operation, comprising:
identifying a node to receive the plurality of the RAID I/O requests;
locating disk objects using a PE universally unique identifier (UUID) comprising a Local Disk Manager (LDM) UUID and a disk UUID;
generating a PE base sector offset by shifting the PE UUID by a predefined number of bits;
issuing a read I/O request to the disk objects based on the PE base sector offset for a processing; and
returning data to the identified node.
16. The data processing system of claim 15 , wherein the information associated with the PE comprises a PE UUID identifying a PE location, a stripe offset within the PE, and a data buffer.
17. The data processing system of claim 15 , wherein the processing of each of the RAID I/O requests further comprises:
adding the generated PE base sector offset to the PE stripe offset.
18. The data processing system of claim 17 , wherein the operations further comprise:
identifying the node to receive the plurality of the RAID I/O requests and write data;
issuing a write I/O request to the disk objects for a processing; and
returning an I/O completion status to the identified node.
19. The data processing system of claim 17 , wherein the data is provided to the file system once all of the plurality of the RAID I/O requests are processed.
20. The data processing system of claim 18 , wherein the I/O completion status is transmitted to the file system once all of the plurality of the RAID I/O requests are processed.