elukey@an-worker1080:~$ tail -n+1 step*
==> step1 <==
#!/bin/bash
set -e
set -x

# Create a logical volumne for JournalNode data.
# There should only be one VG, look up its name:
vgname=$(vgdisplay -C --noheadings -o vg_name | head -n 1 | tr -d ' ')
lvcreate -n journalnode -L 10G $vgname

# make an ext4 filesystem
mkfs.ext4 /dev/$vgname/journalnode

# Don't reserve any blocks for OS on this partition.
tune2fs -m 0 /dev/$vgname/journalnode

mount_point=/var/lib/hadoop/journal
mkdir -pv $mount_point
grep -q $mount_point /etc/fstab || echo -e "# # Hadoop JournalNode partition\n/dev/$vgname/journalnode\t${mount_point}\text4\tdefaults,noatime\t0\t2" | tee -a /etc/fstab

mount -v $mount_point

==> step2 <==
#!/bin/bash
set -e
set -x

for disk_letter in b c d e f g h i j k l m; do
    disk=/dev/sd${disk_letter}
    parted ${disk} --script mklabel gpt
    parted ${disk} --script mkpart primary ext4 0% 100%

    partition=${disk}1
    mkfs.ext4 $partition
done

==> step3 <==
#!/bin/bash
set -e
set -x

data_directory=/var/lib/hadoop/data
for disk_letter in b c d e f g h i j k l m; do
    partition_number=1
    partition="/dev/sd${disk_letter}${partition_number}"
    mount_point="${data_directory}/${disk_letter}"
    # Don't reserve any blocks for OS on these partitions.
    tune2fs -m 0 $partition

    # Make the mount point.
    mkdir -pv $mount_point
    # add it to fstab unless it is already there
    grep -q $mount_point /etc/fstab || (
        uuid=$(blkid | grep primary | grep ${partition} | awk '{print $2}' | sed -e 's/[:"]//g')
        echo -e "# Hadoop DataNode partition ${disk_letter}\n${uuid}\t${mount_point}\text4\tdefaults,noatime\t0\t2" | tee -a /etc/fstab
    )

    mount -v $mount_point
done

==> step4 <==
# ReadAhead Adaptive
megacli -LDSetProp ADRA -LALL -aALL

# Direct (No cache)
megacli -LDSetProp -Direct -LALL -aALL

# No write cache if bad BBU
megacli -LDSetProp NoCachedBadBBU -LALL -aALL

# Disable BBU auto-learn
echo "autoLearnMode=1" > /tmp/disable_learn && megacli -AdpBbuCmd -SetBbuProperties -f /tmp/disable_learn -a0