Dynamically selecting segment heights in a heterogeneous RAID group

1. A system comprising:

a solid-state storage system comprising a plurality of solid-state storage devices; and

a storage controller coupled to the solid-state storage system, the storage controller comprising a processing device, the processing device to:

select a segment height based on erase block sizes of the plurality of solid-state storage devices, the segment height based on a multiple of the erase block sizes, wherein the plurality of solid-state storage devices comprise at least two solid-state storage devices having different erase block sizes;

write a data segment using the segment height to a data stripe across two or more of the plurality of solid-state storage devices; and

store the segment height in metadata associated with the data segment.

2. The system of claim 1 , wherein the multiple of the erase block sizes is a smallest erase block size.

3. The system of claim 1 , wherein the processing device is further to:

determine a new segment height based on the erase block sizes of the plurality of solid-state storage devices upon determining that the segment height based on the multiple exceeds a threshold.

4. The system of claim 1 , wherein

the multiple is a smallest erase block size of the erase block sizes, and wherein the segment height is a multiple of the smallest erase block size.

5. The system of claim 1 , wherein the processing device is further to:

select a new segment height upon determining that an erase block size of at least one of the plurality of solid-state storage devices has changed based on a configuration change, wherein the new segment height is based on the erase block sizes of the plurality of solid-state storage devices and the erase block size of the at least one of the plurality of solid-state storage devices that has changed.

6. The system of claim 1 , wherein to select the segment height based on the erase block sizes associated with the plurality of solid-state storage devices, the processing device is further to:

determine the segment height that corresponds to a largest erase block size of the plurality of solid-state storage devices.

7. A method, comprising:

selecting, by a processing device of a storage controller, a segment height based on erase block sizes of a plurality of solid-state storage devices, the segment height based on a multiple of the erase block sizes, wherein the plurality of solid-state storage devices comprise at least two solid-state storage devices having different erase block sizes;

writing a data segment using the segment height to a data stripe across two or more of the plurality of solid-state storage devices; and

storing the segment height in metadata associated with the data segment.

8. The method of claim 7 , wherein the multiple of the erase block sizes is a smallest erase block size.

9. The method of claim 7 , further comprising:

determining a new segment height based on the erase block sizes of the plurality of solid-state storage devices upon determining that the segment height based on the multiple exceeds a threshold.

10. The method of claim 7 , wherein the multiple is a smallest erase block size of the erase block sizes.

11. The method of claim 7 , further comprising:

selecting a new segment height upon determining that an erase block size of at least one of the plurality of solid-state storage devices has changed based on a configuration change, wherein the new segment height is based on the erase block sizes of the plurality of solid-state storage devices and the erase block size of the at least one of the plurality of solid-state storage devices that has changed.

12. The method of claim 7 , wherein selecting the segment height based on the erase block sizes associated with the plurality of solid-state storage devices further comprises:

determining the segment height that corresponds to a largest erase block size of the plurality of solid-state storage devices.

13. A non-transitory computer readable storage medium storing instructions, which when executed, cause a processing device to:

select a segment height based on erase block sizes of a plurality of solid-state storage devices, the segment height based on a multiple of the erase block sizes, wherein the plurality of solid-state storage devices comprise at least two solid-state storage devices having different erase block sizes;

write a data segment using the segment height to a data stripe across two or more of the plurality of solid-state storage devices; and

store the segment height in metadata associated with the data segment.

14. The non-transitory computer readable storage medium of claim 13 , wherein the multiple of the erase block sizes is a smallest erase block size.

15. The non-transitory computer readable storage medium of claim 13 , wherein the multiple is a smallest erase block size of the erase block.

16. The non-transitory computer readable storage medium of claim 13 , wherein the processing device is further to:

select a new segment height upon determining that an erase block size of at least one of the plurality of solid-state storage devices has changed based on a configuration change, wherein the new segment height is based on the erase block sizes of the plurality of solid-state storage devices and the erase block size of the at least one of the plurality of solid-state storage devices that has changed.

17. The non-transitory computer readable storage medium of claim 13 , wherein to select the segment height based on the erase block sizes associated with the plurality of solid-state storage devices, the processing device is further to:

determine the segment height that corresponds to a largest erase block size of the plurality of solid-state storage devices.