+ def Exec(self, feedback_fn):
+ """Execute disk replacement.
+
+ This dispatches the disk replacement to the appropriate handler.
+
+ """
+ self.replacer.Exec()
+
+
+class _DiskReplacer:
+ """Replaces disks for an instance.
+
+ Note: Locking is not within the scope of this class.
+
+ """
+ def __init__(self, lu, instance_name, mode, iallocator_name, remote_node,
+ disks):
+ """Initializes this class.
+
+ """
+ # Parameters
+ self.lu = lu
+ self.instance_name = instance_name
+ self.mode = mode
+ self.iallocator_name = iallocator_name
+ self.remote_node = remote_node
+ self.disks = disks
+
+ # Shortcuts
+ self.cfg = lu.cfg
+ self.rpc = lu.rpc
+
+ # Runtime data
+ self.instance = None
+ self.new_node = None
+ self.target_node = None
+ self.other_node = None
+ self.remote_node_info = None
+ self.node_secondary_ip = None
+
+ @staticmethod
+ def CheckArguments(mode, remote_node, iallocator):
+ # check for valid parameter combination
+ cnt = [remote_node, iallocator].count(None)
+ if mode == constants.REPLACE_DISK_CHG:
+ if cnt == 2:
+ raise errors.OpPrereqError("When changing the secondary either an"
+ " iallocator script must be used or the"
+ " new node given")
+ elif cnt == 0:
+ raise errors.OpPrereqError("Give either the iallocator or the new"
+ " secondary, not both")
+ else: # not replacing the secondary
+ if cnt != 2:
+ raise errors.OpPrereqError("The iallocator and new node options can"
+ " be used only when changing the"
+ " secondary node")
+
+ @staticmethod
+ def _RunAllocator(lu, iallocator_name, instance_name, relocate_from):
+ """Compute a new secondary node using an IAllocator.
+
+ """
+ ial = IAllocator(lu.cfg, lu.rpc,
+ mode=constants.IALLOCATOR_MODE_RELOC,
+ name=instance_name,
+ relocate_from=relocate_from)
+
+ ial.Run(iallocator_name)
+
+ if not ial.success:
+ raise errors.OpPrereqError("Can't compute nodes using iallocator '%s':"
+ " %s" % (iallocator_name, ial.info))
+
+ if len(ial.nodes) != ial.required_nodes:
+ raise errors.OpPrereqError("iallocator '%s' returned invalid number"
+ " of nodes (%s), required %s" %
+ (len(ial.nodes), ial.required_nodes))
+
+ remote_node_name = ial.nodes[0]
+
+ lu.LogInfo("Selected new secondary for instance '%s': %s",
+ instance_name, remote_node_name)
+
+ return remote_node_name
+
+ def CheckPrereq(self):
+ """Check prerequisites.
+
+ This checks that the instance is in the cluster.
+
+ """
+ self.instance = self.cfg.GetInstanceInfo(self.instance_name)
+ assert self.instance is not None, \
+ "Cannot retrieve locked instance %s" % self.instance_name
+
+ if self.instance.disk_template != constants.DT_DRBD8:
projects / ganeti-local / blobdiff