+-- | A separate name for the cluster score type.
+type Score = Double
+
+-- | A separate name for a weight metric.
+type Weight = Double
+
+-- | The Group UUID type
+type GroupID = String
+
+-- | The resource spec type.
+data RSpec = RSpec
+ { rspecCpu :: Int -- ^ Requested VCPUs
+ , rspecMem :: Int -- ^ Requested memory
+ , rspecDsk :: Int -- ^ Requested disk
+ } deriving (Show, Eq)
+
+-- | The dynamic resource specs of a machine (i.e. load or load
+-- capacity, as opposed to size).
+data DynUtil = DynUtil
+ { cpuWeight :: Weight -- ^ Standardised CPU usage
+ , memWeight :: Weight -- ^ Standardised memory load
+ , dskWeight :: Weight -- ^ Standardised disk I\/O usage
+ , netWeight :: Weight -- ^ Standardised network usage
+ } deriving (Show, Eq)
+
+-- | Initial empty utilisation
+zeroUtil :: DynUtil
+zeroUtil = DynUtil { cpuWeight = 0, memWeight = 0
+ , dskWeight = 0, netWeight = 0 }
+
+baseUtil :: DynUtil
+baseUtil = DynUtil { cpuWeight = 1, memWeight = 1
+ , dskWeight = 1, netWeight = 1 }
+
+addUtil :: DynUtil -> DynUtil -> DynUtil
+addUtil (DynUtil a1 a2 a3 a4) (DynUtil b1 b2 b3 b4) =
+ DynUtil (a1+b1) (a2+b2) (a3+b3) (a4+b4)
+
+subUtil :: DynUtil -> DynUtil -> DynUtil
+subUtil (DynUtil a1 a2 a3 a4) (DynUtil b1 b2 b3 b4) =
+ DynUtil (a1-b1) (a2-b2) (a3-b3) (a4-b4)
+
+-- | The description of an instance placement. It contains the
+-- instance index, the new primary and secondary node, the move being
+-- performed and the score of the cluster after the move.
+type Placement = (Idx, Ndx, Ndx, IMove, Score)
+
+-- | An instance move definition
+data IMove = Failover -- ^ Failover the instance (f)
+ | ReplacePrimary Ndx -- ^ Replace primary (f, r:np, f)
+ | ReplaceSecondary Ndx -- ^ Replace secondary (r:ns)
+ | ReplaceAndFailover Ndx -- ^ Replace secondary, failover (r:np, f)
+ | FailoverAndReplace Ndx -- ^ Failover, replace secondary (f, r:ns)
+ deriving (Show)
+
+-- | Formatted solution output for one move (involved nodes and
+-- commands
+type MoveJob = ([Ndx], Idx, IMove, [String])
+
+-- | Unknown field in table output
+unknownField :: String
+unknownField = "<unknown field>"
+
+-- | A list of command elements
+type JobSet = [MoveJob]
+
+-- | Connection timeout (when using non-file methods).
+connTimeout :: Int
+connTimeout = 15
+
+-- | The default timeout for queries (when using non-file methods).
+queryTimeout :: Int
+queryTimeout = 60
+
+-- | Default vcpu-to-pcpu ratio (randomly chosen value).
+defVcpuRatio :: Double
+defVcpuRatio = 64
+
+-- | Default max disk usage ratio.
+defReservedDiskRatio :: Double
+defReservedDiskRatio = 0
+
+-- | Base memory unit.
+unitMem :: Int
+unitMem = 64
+
+-- | Base disk unit.
+unitDsk :: Int
+unitDsk = 256
+
+-- | Base vcpus unit.
+unitCpu :: Int
+unitCpu = 1
+