Examples with ExcludeList com.cloud.deploy.DeploymentPlanner.ExcludeList used on opensource projects

Example 11 with ExcludeList

use of com.cloud.deploy.DeploymentPlanner.ExcludeList in project cloudstack by apache.

the class ManagementServerImpl method hasSuitablePoolsForVolume.

private boolean hasSuitablePoolsForVolume(final VolumeVO volume, final Host host, final VirtualMachineProfile vmProfile) {
    final DiskOfferingVO diskOffering = _diskOfferingDao.findById(volume.getDiskOfferingId());
    final DiskProfile diskProfile = new DiskProfile(volume, diskOffering, vmProfile.getHypervisorType());
    final DataCenterDeployment plan = new DataCenterDeployment(host.getDataCenterId(), host.getPodId(), host.getClusterId(), host.getId(), null, null);
    final ExcludeList avoid = new ExcludeList();
    for (final StoragePoolAllocator allocator : _storagePoolAllocators) {
        final List<StoragePool> poolList = allocator.allocateToPool(diskProfile, vmProfile, plan, avoid, 1);
        if (poolList != null && !poolList.isEmpty()) {
            return true;
        }
    }
    return false;
}

Example 12 with ExcludeList

use of com.cloud.deploy.DeploymentPlanner.ExcludeList in project cloudstack by apache.

the class FirstFitPlannerTest method checkClusterReorderingForStartVMWithThresholdCheckDisabled.

@Test
public void checkClusterReorderingForStartVMWithThresholdCheckDisabled() throws InsufficientServerCapacityException {
    VirtualMachineProfileImpl vmProfile = mock(VirtualMachineProfileImpl.class);
    DataCenterDeployment plan = mock(DataCenterDeployment.class);
    ExcludeList avoids = mock(ExcludeList.class);
    initializeForTest(vmProfile, plan, avoids);
    List<Long> clustersCrossingThreshold = initializeForClusterThresholdDisabled();
    List<Long> clusterList = planner.orderClusters(vmProfile, plan, avoids);
    assertTrue("Reordered cluster list does not have clusters exceeding threshold", (clusterList.containsAll(clustersCrossingThreshold)));
}

Example 13 with ExcludeList

use of com.cloud.deploy.DeploymentPlanner.ExcludeList in project cloudstack by apache.

the class DeploymentPlanningManagerImpl method checkClustersforDestination.

// /refactoring planner methods
private DeployDestination checkClustersforDestination(List<Long> clusterList, VirtualMachineProfile vmProfile, DeploymentPlan plan, ExcludeList avoid, DataCenter dc, DeploymentPlanner.PlannerResourceUsage resourceUsageRequired, ExcludeList plannerAvoidOutput) {
    if (s_logger.isTraceEnabled()) {
        s_logger.trace("ClusterId List to consider: " + clusterList);
    }
    for (Long clusterId : clusterList) {
        ClusterVO clusterVO = _clusterDao.findById(clusterId);
        if (clusterVO.getHypervisorType() != vmProfile.getHypervisorType()) {
            s_logger.debug("Cluster: " + clusterId + " has HyperVisorType that does not match the VM, skipping this cluster");
            avoid.addCluster(clusterVO.getId());
            continue;
        }
        s_logger.debug("Checking resources in Cluster: " + clusterId + " under Pod: " + clusterVO.getPodId());
        // search for resources(hosts and storage) under this zone, pod,
        // cluster.
        DataCenterDeployment potentialPlan = new DataCenterDeployment(plan.getDataCenterId(), clusterVO.getPodId(), clusterVO.getId(), null, plan.getPoolId(), null, plan.getReservationContext());
        // find suitable hosts under this cluster, need as many hosts as we
        // get.
        List<Host> suitableHosts = findSuitableHosts(vmProfile, potentialPlan, avoid, HostAllocator.RETURN_UPTO_ALL);
        // pools for each volume of the VM
        if (suitableHosts != null && !suitableHosts.isEmpty()) {
            if (vmProfile.getHypervisorType() == HypervisorType.BareMetal) {
                Pod pod = _podDao.findById(clusterVO.getPodId());
                DeployDestination dest = new DeployDestination(dc, pod, clusterVO, suitableHosts.get(0));
                return dest;
            }
            Pair<Map<Volume, List<StoragePool>>, List<Volume>> result = findSuitablePoolsForVolumes(vmProfile, potentialPlan, avoid, StoragePoolAllocator.RETURN_UPTO_ALL);
            Map<Volume, List<StoragePool>> suitableVolumeStoragePools = result.first();
            List<Volume> readyAndReusedVolumes = result.second();
            // choose the potential host and pool for the VM
            if (!suitableVolumeStoragePools.isEmpty()) {
                Pair<Host, Map<Volume, StoragePool>> potentialResources = findPotentialDeploymentResources(suitableHosts, suitableVolumeStoragePools, avoid, resourceUsageRequired, readyAndReusedVolumes);
                if (potentialResources != null) {
                    Pod pod = _podDao.findById(clusterVO.getPodId());
                    Host host = _hostDao.findById(potentialResources.first().getId());
                    Map<Volume, StoragePool> storageVolMap = potentialResources.second();
                    // we don't have to prepare this volume.
                    for (Volume vol : readyAndReusedVolumes) {
                        storageVolMap.remove(vol);
                    }
                    DeployDestination dest = new DeployDestination(dc, pod, clusterVO, host, storageVolMap);
                    s_logger.debug("Returning Deployment Destination: " + dest);
                    return dest;
                }
            } else {
                s_logger.debug("No suitable storagePools found under this Cluster: " + clusterId);
            }
        } else {
            s_logger.debug("No suitable hosts found under this Cluster: " + clusterId);
        }
        if (canAvoidCluster(clusterVO, avoid, plannerAvoidOutput, vmProfile)) {
            avoid.addCluster(clusterVO.getId());
        }
    }
    s_logger.debug("Could not find suitable Deployment Destination for this VM under any clusters, returning. ");
    return null;
}

Example 14 with ExcludeList

use of com.cloud.deploy.DeploymentPlanner.ExcludeList in project cloudstack by apache.

the class VirtualMachineManagerImpl method orchestrateStart.

@Override
public void orchestrateStart(final String vmUuid, final Map<VirtualMachineProfile.Param, Object> params, final DeploymentPlan planToDeploy, final DeploymentPlanner planner) throws InsufficientCapacityException, ConcurrentOperationException, ResourceUnavailableException {
    final CallContext cctxt = CallContext.current();
    final Account account = cctxt.getCallingAccount();
    final User caller = cctxt.getCallingUser();
    VMInstanceVO vm = _vmDao.findByUuid(vmUuid);
    final VirtualMachineGuru vmGuru = getVmGuru(vm);
    final Ternary<VMInstanceVO, ReservationContext, ItWorkVO> start = changeToStartState(vmGuru, vm, caller, account);
    if (start == null) {
        return;
    }
    vm = start.first();
    final ReservationContext ctx = start.second();
    ItWorkVO work = start.third();
    VMInstanceVO startedVm = null;
    final ServiceOfferingVO offering = _offeringDao.findById(vm.getId(), vm.getServiceOfferingId());
    final VirtualMachineTemplate template = _entityMgr.findByIdIncludingRemoved(VirtualMachineTemplate.class, vm.getTemplateId());
    if (s_logger.isDebugEnabled()) {
        s_logger.debug("Trying to deploy VM, vm has dcId: " + vm.getDataCenterId() + " and podId: " + vm.getPodIdToDeployIn());
    }
    DataCenterDeployment plan = new DataCenterDeployment(vm.getDataCenterId(), vm.getPodIdToDeployIn(), null, null, null, null, ctx);
    if (planToDeploy != null && planToDeploy.getDataCenterId() != 0) {
        if (s_logger.isDebugEnabled()) {
            s_logger.debug("advanceStart: DeploymentPlan is provided, using dcId:" + planToDeploy.getDataCenterId() + ", podId: " + planToDeploy.getPodId() + ", clusterId: " + planToDeploy.getClusterId() + ", hostId: " + planToDeploy.getHostId() + ", poolId: " + planToDeploy.getPoolId());
        }
        plan = new DataCenterDeployment(planToDeploy.getDataCenterId(), planToDeploy.getPodId(), planToDeploy.getClusterId(), planToDeploy.getHostId(), planToDeploy.getPoolId(), planToDeploy.getPhysicalNetworkId(), ctx);
    }
    final HypervisorGuru hvGuru = _hvGuruMgr.getGuru(vm.getHypervisorType());
    boolean canRetry = true;
    ExcludeList avoids = null;
    try {
        final Journal journal = start.second().getJournal();
        if (planToDeploy != null) {
            avoids = planToDeploy.getAvoids();
        }
        if (avoids == null) {
            avoids = new ExcludeList();
        }
        if (s_logger.isDebugEnabled()) {
            s_logger.debug("Deploy avoids pods: " + avoids.getPodsToAvoid() + ", clusters: " + avoids.getClustersToAvoid() + ", hosts: " + avoids.getHostsToAvoid());
        }
        boolean planChangedByVolume = false;
        boolean reuseVolume = true;
        final DataCenterDeployment originalPlan = plan;
        int retry = StartRetry.value();
        while (retry-- != 0) {
            if (reuseVolume) {
                // edit plan if this vm's ROOT volume is in READY state already
                final List<VolumeVO> vols = _volsDao.findReadyRootVolumesByInstance(vm.getId());
                for (final VolumeVO vol : vols) {
                    // make sure if the templateId is unchanged. If it is changed,
                    // let planner
                    // reassign pool for the volume even if it ready.
                    final Long volTemplateId = vol.getTemplateId();
                    if (volTemplateId != null && volTemplateId.longValue() != template.getId()) {
                        if (s_logger.isDebugEnabled()) {
                            s_logger.debug(vol + " of " + vm + " is READY, but template ids don't match, let the planner reassign a new pool");
                        }
                        continue;
                    }
                    final StoragePool pool = (StoragePool) dataStoreMgr.getPrimaryDataStore(vol.getPoolId());
                    if (!pool.isInMaintenance()) {
                        if (s_logger.isDebugEnabled()) {
                            s_logger.debug("Root volume is ready, need to place VM in volume's cluster");
                        }
                        final long rootVolDcId = pool.getDataCenterId();
                        final Long rootVolPodId = pool.getPodId();
                        final Long rootVolClusterId = pool.getClusterId();
                        if (planToDeploy != null && planToDeploy.getDataCenterId() != 0) {
                            final Long clusterIdSpecified = planToDeploy.getClusterId();
                            if (clusterIdSpecified != null && rootVolClusterId != null) {
                                if (rootVolClusterId.longValue() != clusterIdSpecified.longValue()) {
                                    // planner
                                    if (s_logger.isDebugEnabled()) {
                                        s_logger.debug("Cannot satisfy the deployment plan passed in since the ready Root volume is in different cluster. volume's cluster: " + rootVolClusterId + ", cluster specified: " + clusterIdSpecified);
                                    }
                                    throw new ResourceUnavailableException("Root volume is ready in different cluster, Deployment plan provided cannot be satisfied, unable to create a deployment for " + vm, Cluster.class, clusterIdSpecified);
                                }
                            }
                            plan = new DataCenterDeployment(planToDeploy.getDataCenterId(), planToDeploy.getPodId(), planToDeploy.getClusterId(), planToDeploy.getHostId(), vol.getPoolId(), null, ctx);
                        } else {
                            plan = new DataCenterDeployment(rootVolDcId, rootVolPodId, rootVolClusterId, null, vol.getPoolId(), null, ctx);
                            if (s_logger.isDebugEnabled()) {
                                s_logger.debug(vol + " is READY, changing deployment plan to use this pool's dcId: " + rootVolDcId + " , podId: " + rootVolPodId + " , and clusterId: " + rootVolClusterId);
                            }
                            planChangedByVolume = true;
                        }
                    }
                }
            }
            final Account owner = _entityMgr.findById(Account.class, vm.getAccountId());
            final VirtualMachineProfileImpl vmProfile = new VirtualMachineProfileImpl(vm, template, offering, owner, params);
            DeployDestination dest = null;
            try {
                dest = _dpMgr.planDeployment(vmProfile, plan, avoids, planner);
            } catch (final AffinityConflictException e2) {
                s_logger.warn("Unable to create deployment, affinity rules associted to the VM conflict", e2);
                throw new CloudRuntimeException("Unable to create deployment, affinity rules associted to the VM conflict");
            }
            if (dest == null) {
                if (planChangedByVolume) {
                    plan = originalPlan;
                    planChangedByVolume = false;
                    //do not enter volume reuse for next retry, since we want to look for resources outside the volume's cluster
                    reuseVolume = false;
                    continue;
                }
                throw new InsufficientServerCapacityException("Unable to create a deployment for " + vmProfile, DataCenter.class, plan.getDataCenterId(), areAffinityGroupsAssociated(vmProfile));
            }
            if (dest != null) {
                avoids.addHost(dest.getHost().getId());
                journal.record("Deployment found ", vmProfile, dest);
            }
            long destHostId = dest.getHost().getId();
            vm.setPodIdToDeployIn(dest.getPod().getId());
            final Long cluster_id = dest.getCluster().getId();
            final ClusterDetailsVO cluster_detail_cpu = _clusterDetailsDao.findDetail(cluster_id, "cpuOvercommitRatio");
            final ClusterDetailsVO cluster_detail_ram = _clusterDetailsDao.findDetail(cluster_id, "memoryOvercommitRatio");
            //storing the value of overcommit in the vm_details table for doing a capacity check in case the cluster overcommit ratio is changed.
            if (_uservmDetailsDao.findDetail(vm.getId(), "cpuOvercommitRatio") == null && (Float.parseFloat(cluster_detail_cpu.getValue()) > 1f || Float.parseFloat(cluster_detail_ram.getValue()) > 1f)) {
                _uservmDetailsDao.addDetail(vm.getId(), "cpuOvercommitRatio", cluster_detail_cpu.getValue(), true);
                _uservmDetailsDao.addDetail(vm.getId(), "memoryOvercommitRatio", cluster_detail_ram.getValue(), true);
            } else if (_uservmDetailsDao.findDetail(vm.getId(), "cpuOvercommitRatio") != null) {
                _uservmDetailsDao.addDetail(vm.getId(), "cpuOvercommitRatio", cluster_detail_cpu.getValue(), true);
                _uservmDetailsDao.addDetail(vm.getId(), "memoryOvercommitRatio", cluster_detail_ram.getValue(), true);
            }
            vmProfile.setCpuOvercommitRatio(Float.parseFloat(cluster_detail_cpu.getValue()));
            vmProfile.setMemoryOvercommitRatio(Float.parseFloat(cluster_detail_ram.getValue()));
            StartAnswer startAnswer = null;
            try {
                if (!changeState(vm, Event.OperationRetry, destHostId, work, Step.Prepare)) {
                    throw new ConcurrentOperationException("Unable to update the state of the Virtual Machine " + vm.getUuid() + " oldstate: " + vm.getState() + "Event :" + Event.OperationRetry);
                }
            } catch (final NoTransitionException e1) {
                throw new ConcurrentOperationException(e1.getMessage());
            }
            try {
                if (s_logger.isDebugEnabled()) {
                    s_logger.debug("VM is being created in podId: " + vm.getPodIdToDeployIn());
                }
                _networkMgr.prepare(vmProfile, new DeployDestination(dest.getDataCenter(), dest.getPod(), null, null), ctx);
                if (vm.getHypervisorType() != HypervisorType.BareMetal) {
                    volumeMgr.prepare(vmProfile, dest);
                }
                //since StorageMgr succeeded in volume creation, reuse Volume for further tries until current cluster has capacity
                if (!reuseVolume) {
                    reuseVolume = true;
                }
                Commands cmds = null;
                vmGuru.finalizeVirtualMachineProfile(vmProfile, dest, ctx);
                final VirtualMachineTO vmTO = hvGuru.implement(vmProfile);
                handlePath(vmTO.getDisks(), vm.getHypervisorType());
                cmds = new Commands(Command.OnError.Stop);
                cmds.addCommand(new StartCommand(vmTO, dest.getHost(), getExecuteInSequence(vm.getHypervisorType())));
                vmGuru.finalizeDeployment(cmds, vmProfile, dest, ctx);
                work = _workDao.findById(work.getId());
                if (work == null || work.getStep() != Step.Prepare) {
                    throw new ConcurrentOperationException("Work steps have been changed: " + work);
                }
                _workDao.updateStep(work, Step.Starting);
                _agentMgr.send(destHostId, cmds);
                _workDao.updateStep(work, Step.Started);
                startAnswer = cmds.getAnswer(StartAnswer.class);
                if (startAnswer != null && startAnswer.getResult()) {
                    handlePath(vmTO.getDisks(), startAnswer.getIqnToPath());
                    final String host_guid = startAnswer.getHost_guid();
                    if (host_guid != null) {
                        final HostVO finalHost = _resourceMgr.findHostByGuid(host_guid);
                        if (finalHost == null) {
                            throw new CloudRuntimeException("Host Guid " + host_guid + " doesn't exist in DB, something went wrong while processing start answer: " + startAnswer);
                        }
                        destHostId = finalHost.getId();
                    }
                    if (vmGuru.finalizeStart(vmProfile, destHostId, cmds, ctx)) {
                        syncDiskChainChange(startAnswer);
                        if (!changeState(vm, Event.OperationSucceeded, destHostId, work, Step.Done)) {
                            s_logger.error("Unable to transition to a new state. VM uuid: " + vm.getUuid() + "VM oldstate:" + vm.getState() + "Event:" + Event.OperationSucceeded);
                            throw new ConcurrentOperationException("Failed to deploy VM" + vm.getUuid());
                        }
                        // Update GPU device capacity
                        final GPUDeviceTO gpuDevice = startAnswer.getVirtualMachine().getGpuDevice();
                        if (gpuDevice != null) {
                            _resourceMgr.updateGPUDetails(destHostId, gpuDevice.getGroupDetails());
                        }
                        // information isn't set,
                        if (_uservmDetailsDao.findDetail(vm.getId(), "deployvm") != null) {
                            _uservmDetailsDao.removeDetail(vm.getId(), "deployvm");
                        }
                        startedVm = vm;
                        if (s_logger.isDebugEnabled()) {
                            s_logger.debug("Start completed for VM " + vm);
                        }
                        return;
                    } else {
                        if (s_logger.isDebugEnabled()) {
                            s_logger.info("The guru did not like the answers so stopping " + vm);
                        }
                        StopCommand stopCmd = new StopCommand(vm, getExecuteInSequence(vm.getHypervisorType()), false);
                        stopCmd.setControlIp(getControlNicIpForVM(vm));
                        final StopCommand cmd = stopCmd;
                        final Answer answer = _agentMgr.easySend(destHostId, cmd);
                        if (answer != null && answer instanceof StopAnswer) {
                            final StopAnswer stopAns = (StopAnswer) answer;
                            if (vm.getType() == VirtualMachine.Type.User) {
                                final String platform = stopAns.getPlatform();
                                if (platform != null) {
                                    final Map<String, String> vmmetadata = new HashMap<String, String>();
                                    vmmetadata.put(vm.getInstanceName(), platform);
                                    syncVMMetaData(vmmetadata);
                                }
                            }
                        }
                        if (answer == null || !answer.getResult()) {
                            s_logger.warn("Unable to stop " + vm + " due to " + (answer != null ? answer.getDetails() : "no answers"));
                            _haMgr.scheduleStop(vm, destHostId, WorkType.ForceStop);
                            throw new ExecutionException("Unable to stop this VM, " + vm.getUuid() + " so we are unable to retry the start operation");
                        }
                        throw new ExecutionException("Unable to start  VM:" + vm.getUuid() + " due to error in finalizeStart, not retrying");
                    }
                }
                s_logger.info("Unable to start VM on " + dest.getHost() + " due to " + (startAnswer == null ? " no start answer" : startAnswer.getDetails()));
                if (startAnswer != null && startAnswer.getContextParam("stopRetry") != null) {
                    break;
                }
            } catch (OperationTimedoutException e) {
                s_logger.debug("Unable to send the start command to host " + dest.getHost() + " failed to start VM: " + vm.getUuid());
                if (e.isActive()) {
                    _haMgr.scheduleStop(vm, destHostId, WorkType.CheckStop);
                }
                canRetry = false;
                throw new AgentUnavailableException("Unable to start " + vm.getHostName(), destHostId, e);
            } catch (final ResourceUnavailableException e) {
                s_logger.info("Unable to contact resource.", e);
                if (!avoids.add(e)) {
                    if (e.getScope() == Volume.class || e.getScope() == Nic.class) {
                        throw e;
                    } else {
                        s_logger.warn("unexpected ResourceUnavailableException : " + e.getScope().getName(), e);
                        throw e;
                    }
                }
            } catch (final InsufficientCapacityException e) {
                s_logger.info("Insufficient capacity ", e);
                if (!avoids.add(e)) {
                    if (e.getScope() == Volume.class || e.getScope() == Nic.class) {
                        throw e;
                    } else {
                        s_logger.warn("unexpected InsufficientCapacityException : " + e.getScope().getName(), e);
                    }
                }
            } catch (final ExecutionException e) {
                s_logger.error("Failed to start instance " + vm, e);
                throw new AgentUnavailableException("Unable to start instance due to " + e.getMessage(), destHostId, e);
            } catch (final NoTransitionException e) {
                s_logger.error("Failed to start instance " + vm, e);
                throw new AgentUnavailableException("Unable to start instance due to " + e.getMessage(), destHostId, e);
            } finally {
                if (startedVm == null && canRetry) {
                    final Step prevStep = work.getStep();
                    _workDao.updateStep(work, Step.Release);
                    // If previous step was started/ing && we got a valid answer
                    if ((prevStep == Step.Started || prevStep == Step.Starting) && startAnswer != null && startAnswer.getResult()) {
                        //TODO check the response of cleanup and record it in DB for retry
                        cleanup(vmGuru, vmProfile, work, Event.OperationFailed, false);
                    } else {
                        //if step is not starting/started, send cleanup command with force=true
                        cleanup(vmGuru, vmProfile, work, Event.OperationFailed, true);
                    }
                }
            }
        }
    } finally {
        if (startedVm == null) {
            if (canRetry) {
                try {
                    changeState(vm, Event.OperationFailed, null, work, Step.Done);
                } catch (final NoTransitionException e) {
                    throw new ConcurrentOperationException(e.getMessage());
                }
            }
        }
        if (planToDeploy != null) {
            planToDeploy.setAvoids(avoids);
        }
    }
    if (startedVm == null) {
        throw new CloudRuntimeException("Unable to start instance '" + vm.getHostName() + "' (" + vm.getUuid() + "), see management server log for details");
    }
}

Example 15 with ExcludeList

use of com.cloud.deploy.DeploymentPlanner.ExcludeList in project cloudstack by apache.

the class VirtualMachineManagerImpl method getPoolListForVolumesForMigration.

private Map<Volume, StoragePool> getPoolListForVolumesForMigration(final VirtualMachineProfile profile, final Host host, final Map<Long, Long> volumeToPool) {
    final List<VolumeVO> allVolumes = _volsDao.findUsableVolumesForInstance(profile.getId());
    final Map<Volume, StoragePool> volumeToPoolObjectMap = new HashMap<>();
    for (final VolumeVO volume : allVolumes) {
        final Long poolId = volumeToPool.get(Long.valueOf(volume.getId()));
        final StoragePoolVO destPool = _storagePoolDao.findById(poolId);
        final StoragePoolVO currentPool = _storagePoolDao.findById(volume.getPoolId());
        final DiskOfferingVO diskOffering = _diskOfferingDao.findById(volume.getDiskOfferingId());
        if (destPool != null) {
            // created is compliant with the pool type.
            if (_poolHostDao.findByPoolHost(destPool.getId(), host.getId()) == null || destPool.isLocal() != diskOffering.getUseLocalStorage()) {
                // Cannot find a pool for the volume. Throw an exception.
                throw new CloudRuntimeException("Cannot migrate volume " + volume + " to storage pool " + destPool + " while migrating vm to host " + host + ". Either the pool is not accessible from the host or because of the offering with which the volume is created it cannot be placed on " + "the given pool.");
            } else if (destPool.getId() == currentPool.getId()) {
            // If the pool to migrate to is the same as current pool, the volume doesn't need to be migrated.
            } else {
                volumeToPoolObjectMap.put(volume, destPool);
            }
        } else {
            if (currentPool.isManaged()) {
                volumeToPoolObjectMap.put(volume, currentPool);
            } else {
                // Find a suitable pool for the volume. Call the storage pool allocator to find the list of pools.
                final DiskProfile diskProfile = new DiskProfile(volume, diskOffering, profile.getHypervisorType());
                final DataCenterDeployment plan = new DataCenterDeployment(host.getDataCenterId(), host.getPodId(), host.getClusterId(), host.getId(), null, null);
                final List<StoragePool> poolList = new ArrayList<>();
                final ExcludeList avoid = new ExcludeList();
                for (final StoragePoolAllocator allocator : _storagePoolAllocators) {
                    final List<StoragePool> poolListFromAllocator = allocator.allocateToPool(diskProfile, profile, plan, avoid, StoragePoolAllocator.RETURN_UPTO_ALL);
                    if (poolListFromAllocator != null && !poolListFromAllocator.isEmpty()) {
                        poolList.addAll(poolListFromAllocator);
                    }
                }
                boolean currentPoolAvailable = false;
                if (poolList != null && !poolList.isEmpty()) {
                    // Volume needs to be migrated. Pick the first pool from the list. Add a mapping to migrate the
                    // volume to a pool only if it is required; that is the current pool on which the volume resides
                    // is not available on the destination host.
                    final Iterator<StoragePool> iter = poolList.iterator();
                    while (iter.hasNext()) {
                        if (currentPool.getId() == iter.next().getId()) {
                            currentPoolAvailable = true;
                            break;
                        }
                    }
                    if (!currentPoolAvailable) {
                        volumeToPoolObjectMap.put(volume, _storagePoolDao.findByUuid(poolList.get(0).getUuid()));
                    }
                }
                if (!currentPoolAvailable && !volumeToPoolObjectMap.containsKey(volume)) {
                    // Cannot find a pool for the volume. Throw an exception.
                    throw new CloudRuntimeException("Cannot find a storage pool which is available for volume " + volume + " while migrating virtual machine " + profile.getVirtualMachine() + " to host " + host);
                }
            }
        }
    }
    return volumeToPoolObjectMap;
}