Re: md-raid support 50/60 & spare space support

Hi

> We're probably won't invent a new raid 50/60. BTW we're working on performance
> improvement for large raid5 arrays for at most 64 disks, results looks great.
> However, it might take sometime before we push our work to upstream.

That's great.
Raid5/6 needs to be improved for keeping PCIe 5.0 NVMe SSDs
performance. Just like your lock-less bitmap :-)
I have some PCIe 5.0 CM7-V NVMe SSDs.
So I would be glad to assist you in testing if required.

> Can you explain more about spare space?

I meant distributed spare capacity, instead of dedicated spare disks
(standard hot spares)
As far as I understand, now raid5/6 does not distribute "spare blocks"
evenly across the entire array to allow for the massively parallel,
high-speed rebuilds.

Anton