[mohammedhdotio]

Hello and thanks for your time.

- I've got 1 HDD failure on RAID10 4 x 10TB HDDs, I had to take the system down to do RAID10 rebuild. because running server with huge I/O slowdown the rebuild and I had my fears of second HDD failure. (I had to take the system down anyway). RAID didn't help in my usage scenario.

- I guess deduplication fixes this already.

- Any advice on ways fixing this and preserving my RAID0 usage scenario?

[oofabz]

Broadly speaking, you have two options. One is, make the server faster so that it can keep operating during a rebuild. You could do this by adding more drives. The other option is, add a second server to handle the load while you fix the first.