03_mysql.rb

# iclassify
total_memory = attrib?("memorysize")
if total_memory
  if total_memory =~ /MB$/
    total_memory.gsub!(/ MB/, '')
    total_memory = total_memory.to_f
  else
    total_memory.gsub!(/ GB/, '')
    total_memory = total_memory.to_f * 1024
  end
  buffer_pool_size = total_memory * 0.75
  buffer_pool_size = buffer_pool_size.to_i
  add_attrib("innodb_buffer_pool_size", buffer_pool_size.to_s + "M") unless attrib?("innodb_buffer_po
ol_size")
end

innodb_buffer_pool_size.rb

# facter
def get_buffer_pool_size
total_memory = Facter.value(:memorysize)
if total_memory
  if total_memory =~ /MB$/
    total_memory.gsub!(/ MB/, '')
    total_memory = total_memory.to_f
  else
    total_memory.gsub!(/ GB/, '')
    total_memory = total_memory.to_f * 1024
  end
  buffer_pool_size = total_memory * 0.75
  buffer_pool_size = buffer_pool_size.to_i
  buffer_pool_size.to_s + "M"
end
end

Facter.add("innodb_buffer_pool_size") do
 setcode do
  get_buffer_pool_size
 end
end