Software RAID and TRIM

Hi,


I'm investigating SSD performance on Linux, in particular for RAID devices.

As I understand it—and please correct me if I'm wrong—currently software RAID does not pass through TRIM to the underlying devices. TRIM is essential for the continued high performance of SSDs, which otherwise degrade over time.

I don't think there would be any harm in this command being passed through to underlying devices if they don't support it (they would just ignore it), and if they do it would make high-performance software RAID of SSDs a possibility.


Is this something that's in the works?



Many thanks,

--
Tom De Mulder [off-list ref] - Cambridge University Computing Service
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