Exhibit A: Hardware RAID5. Exhibit B: Software RAID5. Same controller, same disks. Seriously, fuck hardware RAID.pic.twitter.com/EsIurJpKlQ
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What’s the CPU load difference on this?
2% software RAID, 4% hardware RAID. Yes, it's even worse at *that*. I don't even.
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Wow. Although that was different 10-15 years ago, at least with better controllers (I had IPC controllers, the company was later bought ny Adaptec).
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Yeah, modern CPUs have plenty of fancy SIMD instructions that can accelerate RAID5 parity calculation. The CPU usage is basically negligible. > [ 0.660593] raid6: using algorithm avx512x4 gen() 26882 MB/s 26GB/s parity calculation on a single CPU core.
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