Nastavení RAIDu

ARRAYS=""
DISKS=""

for field in `cat /proc/mdstat | grep "active raid6"`
do
  if [[ "x${field:0:2}x" == "xmdx" ]]
  then
    ARRAYS="$ARRAYS $field"
  elif [[ "x${field:0:2}x" == "xsdx" ]]
  then
    DISKS="$DISKS ${field:0:3}"
  fi
done

for disk in $DISKS
do
  # read-ahead to 16MB
  blockdev --setra 16384 /dev/$disk
  # Queue Tuning
  echo 1024 > /sys/block/$disk/queue/read_ahead_kb
  echo 256 > /sys/block/$disk/queue/nr_requests
  # disable NCQ
  echo 1 > /sys/block/$disk/device/queue_depth
done

for array in $ARRAYS
do
  # read-ahead to 64MB
  blockdev --setra 64536 /dev/$array
  # stripe-cache size
  echo 16384 > /sys/block/$array/md/stripe_cache_size
done