2 fast RAID 5 advice

1. If you have RAID 5 system keep the disks in MBR instead of in GPT – at least he gave it to me +10 – +15% difference
2. Be sure to set / sys / block / md0 / md / stripe_cache_size because it is too small by default. Here the values ​​are according to depends on me 32768 gave the most decent result