Inspired by the tuner scripts we used at mp3.com, this sets some performance options for hard disks, and has some specific optimizations for SSD/NVMEs

mp3-tuner.sh

#!/bin/bash
# Tweak hard drive performance stuff
for drive in sda sdb sdc sdd; do
   if [[ -e /dev/${drive} ]] ;then
      #increase readahead buffer on sata devices
      /sbin/blockdev --setra 2048 /dev/${drive}
      echo 1024 > /sys/block/${drive}/queue/read_ahead_kb
      if smartctl -a /dev/${drive} |grep SSD;then
         #SSDs do not have latency issues like traditional hdd so we tweak
         echo "/dev/${drive} is a SSD, tweaking proc entries"
         echo deadline > /sys/block/${drive}/queue/scheduler
         echo 32 > /sys/block/${drive}/queue/read_ahead_kb
         echo 1 >/sys/block/${drive}/queue/iosched/fifo_batch
         echo 0 > /proc/sys/vm/swappiness
      fi
   fi 
done