Systems and methods for off-host backups of striped volumes
A computer-implemented method for off-host backups of striped volumes may include identifying a striped volume of data on which to perform an off-host backup operation. The computer-implemented method may also include identifying a plurality of storage devices underlying the striped volume of data. The computer-implemented method may further include identifying stripe-aware extent metadata for the off-host backup operation. The computer-implemented method may additionally include reading data for the off-host backup operation from the plurality of storage devices in parallel using the stripe-aware extent metadata. Various other methods, systems, and computer-readable media are also disclosed.
1. A computer-implemented method for off-host backups of striped volumes, at least a portion of the method being performed by a computing device comprising at least one processor, the method comprising:
identifying a striped volume of data on which to perform an off-host backup operation;
identifying a plurality of storage devices underlying the striped volume of data;
identifying stripe-aware extent metadata for the off-host backup operation;
transmitting the stripe-aware extent metadata to an off-host backup system;
reading, at the off-host backup system remote from the striped volume of data, data for the off-host backup operation from the plurality of storage devices in parallel using the stripe-aware extent metadata and without mounting the striped volume.
2. The computer-implemented method of claim 1 , wherein the stripe-aware extent metadata comprises at least one of:
a stripe size;
a number of storage devices in the plurality of storage devices;
a base offset for a striped extent for each storage device in the plurality of storage devices;
a total length of the striped extent;
a number of stripes of the striped extent.
3. The computer-implemented method of claim 1 , wherein reading the data from the plurality of storage devices in parallel comprises allocating a buffer for the data.
4. The computer-implemented method of claim 3 , wherein allocating the buffer comprises allocating a buffer of a size of a stripe multiplied by a number of storage devices in the plurality of storage devices.
5. The computer-implemented method of claim 1 , wherein reading the data from the plurality of storage devices in parallel comprises reading a stripe size of data from each storage device in the plurality of storage devices simultaneously.
6. The computer-implemented method of claim 1 , wherein identifying the stripe-aware extent metadata comprises:
identifying a host system that manages the striped volume of data;
receiving, at the off-host backup system, the stripe-aware extent metadata from the host system.
7. The computer-implemented method of claim 1 , wherein the off-host backup operation comprises a server-free backup in which the data for the off-host backup operation is read directly from the striped volume of data instead of being sent from the striped volume of data to the off-host backup system.
8. The computer-implemented method of claim 1 , wherein:
identifying the stripe-aware extent metadata comprises generating the stripe-aware extent metadata;
generating the stripe-aware extent metadata comprises identifying raw extent metadata for the striped volume of data, identifying a pattern in the raw extent metadata implying striping in the striped volume of data, and generating the stripe-aware extent metadata based on the pattern in the raw extent metadata.
9. The computer-implemented method of claim 1 , wherein:
the off-host backup system lacks the ability to directly read the striped volume of data;
the stripe-aware extent metadata enables the off-host backup system to read raw data from the plurality of storage devices.
10. The computer-implemented method of claim 1 , further comprising writing the data for the off-host backup operation to a backup storage system.
11. A system for off-host backups of striped volumes, the system comprising:
an identification module programmed to:
identify a striped volume of data on which to perform an off-host backup operation;
identify a plurality of storage devices underlying the striped volume of data;
a striping module programmed to identify stripe-aware extent metadata for the off-host backup operation and transmit the stripe-aware extent metadata to an off-host backup system;
a backup module programmed to read, at an off-host backup system remote from the striped volume of data, data for the off-host backup operation from the plurality of storage devices in parallel using the stripe-aware extent metadata and without mounting the striped volume of data;
at least one hardware processor configured to execute the identification module, the striping module, and the backup module.
12. The system of claim 11 , wherein the stripe-aware extent metadata comprises at least one of:
a stripe size;
a number of storage devices in the plurality of storage devices;
a base offset for a striped extent for each storage device in the plurality of storage devices;
a total length of the striped extent;
a number of stripes of the striped extent.
13. The system of claim 11 , wherein the backup module is programmed to read the data from the plurality of storage devices in parallel by allocating a buffer for the data.
14. The system of claim 13 , wherein the backup module is programmed to allocate the buffer by allocating a buffer of a size of a stripe multiplied by a number of storage devices in the plurality of storage devices.
15. The system of claim 11 , wherein the backup module is programmed to read the data from the plurality of storage devices in parallel by reading a stripe size of data from each storage device in the plurality of storage devices simultaneously.
16. The system of claim 11 , wherein the striping module is programmed to identify the stripe-aware extent metadata by:
identifying a host system that manages the striped volume of data;
receiving, at the off-host backup system, the stripe-aware extent metadata from the host system.
17. The system of claim 11 , wherein the striping module is programmed to identify the stripe-aware extent metadata by generating the stripe-aware extent metadata.
18. The system of claim 17 , wherein the striping module is programmed to generate the stripe-aware extent metadata by:
identifying raw extent metadata for the striped volume of data;
identifying a pattern in the raw extent metadata implying striping in the striped volume of data;
generating the stripe-aware extent metadata based on the pattern in the raw extent metadata.
19. The system of claim 11 , wherein the backup module is further programmed to write the data for the off-host backup operation to a backup storage system.
20. A non-transitory computer-readable-storage medium comprising one or more computer-executable instructions that, when executed by at least one processor of a computing device, cause the computing device to:
identify a striped volume of data on which to perform an off-host backup operation;
identify a plurality of storage devices underlying the striped volume of data;
identify stripe-aware extent metadata for the off-host backup operation;
transmit the stripe-aware extent metadata to an off-host backup system;
read, at an off-host backup system remote from the striped volume of data, data for the off-host backup operation from the plurality of storage devices in parallel using the stripe-aware extent metadata and without mounting the striped volume of data.