gistfile1.rb

    if node[:ec2][:ephemeral][:devices].include?("/dev/sdd")
      # if we also have sdd and sde, raid0 them and put data there
      data_raid_block_devs = [ "/dev/sdd", "/dev/sde" ]
      data_raid_mountpoint = "/mnt/cassandra_data"
      data_raid_dev = "/dev/md0"
      data_file_dir = Array(node[:cassandra][:data_file_dirs]).first

      package "mdadm" do
        action :install
      end

      mdadm data_raid_dev do
        devices data_raid_block_devs
        level 0
        chunk 128
        action [ :create, :assemble ]
      end

      #TODO this doesn't work the first time, maybe mdadm needs a delay?
      execute "mkfs.xfs -f #{data_raid_dev}" do
        only_if "xfs_admin -l #{data_raid_dev} 2>&1 | grep -qx 'xfs_admin: #{data_raid_dev} is not a valid XFS filesystem (unexpected SB magic number 0x00000000)'"
      end

      #TODO this doesn't get the proper perms, its root/root for some reason
      directory data_raid_mountpoint do
        owner "cassandra"
        group "nogroup"
        mode 0755
      end

      mount data_raid_mountpoint do
        device data_raid_dev
        fstype "xfs"
        options "noatime"
        action :mount
      end

      directory data_file_dir do
        owner "cassandra"
        group "nogroup"
        mode 0755
      end

      mount data_file_dir do
        device data_raid_mountpoint
        fstype "none"
        options "bind,rw"
        action :mount
      end
    end