Examples with SRDFRecommendation com.emc.storageos.volumecontroller.SRDFRecommendation used on opensource projects

Example 1 with SRDFRecommendation

use of com.emc.storageos.volumecontroller.SRDFRecommendation in project coprhd-controller by CoprHD.

the class SRDFBlockServiceApiImpl method createVolumesAndDescriptors.

@Override
public List<VolumeDescriptor> createVolumesAndDescriptors(List<VolumeDescriptor> descriptors, String volumeLabel, Long size, Project project, VirtualArray varray, VirtualPool vpool, List<Recommendation> recommendations, TaskList taskList, String task, VirtualPoolCapabilityValuesWrapper capabilities) {
    List<VolumeDescriptor> volumeDescriptors = new ArrayList<VolumeDescriptor>();
    // If processing SRDFCopyRecommendations, then just return the SRDFTargets.
    for (Recommendation recommendation : recommendations) {
        if (recommendation instanceof SRDFCopyRecommendation) {
            SRDFRecommendation srdfRecommendation = (SRDFRecommendation) recommendation.getRecommendation();
            // Get the Target structure
            SRDFRecommendation.Target target = srdfRecommendation.getVirtualArrayTargetMap().get(recommendation.getVirtualArray());
            if (target.getDescriptors() != null) {
                volumeDescriptors.addAll(target.getDescriptors());
            }
        }
        // so if we had SRDFCopyRecommendations, just return their descriptors now.
        if (!volumeDescriptors.isEmpty()) {
            return volumeDescriptors;
        }
    }
    // operation for each volume to be created.
    if (taskList == null) {
        taskList = new TaskList();
    }
    Iterator<Recommendation> recommendationsIter;
    final BlockConsistencyGroup consistencyGroup = capabilities.getBlockConsistencyGroup() == null ? null : _dbClient.queryObject(BlockConsistencyGroup.class, capabilities.getBlockConsistencyGroup());
    // prepare the volumes
    List<URI> volumeURIs = prepareRecommendedVolumes(task, taskList, project, varray, vpool, capabilities.getResourceCount(), recommendations, consistencyGroup, volumeLabel, size.toString());
    // Execute the volume creations requests for each recommendation.
    recommendationsIter = recommendations.iterator();
    while (recommendationsIter.hasNext()) {
        Recommendation recommendation = recommendationsIter.next();
        volumeDescriptors.addAll(createVolumeDescriptors((SRDFRecommendation) recommendation, volumeURIs, capabilities));
        // Log volume descriptor information
        logVolumeDescriptorPrecreateInfo(volumeDescriptors, task);
    }
    return volumeDescriptors;
}

Example 2 with SRDFRecommendation

use of com.emc.storageos.volumecontroller.SRDFRecommendation in project coprhd-controller by CoprHD.

the class SRDFBlockServiceApiImpl method createVolumeDescriptors.

/**
 * Prep work to call the orchestrator to create the volume descriptors
 *
 * @param recommendation
 *            recommendation object from SRDFRecommendation
 * @param volumeURIs
 *            volumes already prepared
 * @param capabilities
 *            vpool capabilities
 * @return list of volume descriptors
 * @throws ControllerException
 */
private List<VolumeDescriptor> createVolumeDescriptors(final SRDFRecommendation recommendation, final List<URI> volumeURIs, final VirtualPoolCapabilityValuesWrapper capabilities) throws ControllerException {
    List<VolumeDescriptor> descriptors = new ArrayList<VolumeDescriptor>();
    // Package up the prepared Volumes into descriptors
    for (URI volumeURI : volumeURIs) {
        Volume volume = _dbClient.queryObject(Volume.class, volumeURI);
        VolumeDescriptor.Type volumeType = VolumeDescriptor.Type.SRDF_SOURCE;
        // created
        if (recommendation.getVpoolChangeVolume() != null && recommendation.getVpoolChangeVolume().equals(volume.getId())) {
            volumeType = VolumeDescriptor.Type.SRDF_EXISTING_SOURCE;
            VolumeDescriptor desc = new VolumeDescriptor(volumeType, volume.getStorageController(), volume.getId(), volume.getPool(), null, capabilities, volume.getCapacity());
            Map<String, Object> volumeParams = new HashMap<String, Object>();
            volumeParams.put(VolumeDescriptor.PARAM_VPOOL_CHANGE_EXISTING_VOLUME_ID, recommendation.getVpoolChangeVolume());
            volumeParams.put(VolumeDescriptor.PARAM_VPOOL_CHANGE_NEW_VPOOL_ID, recommendation.getVpoolChangeVpool());
            volumeParams.put(VolumeDescriptor.PARAM_VPOOL_CHANGE_OLD_VPOOL_ID, volume.getVirtualPool());
            desc.setParameters(volumeParams);
            descriptors.add(desc);
            _log.info("Adding Source Volume Descriptor for: " + desc.toString());
        } else {
            // Normal create-from-scratch flow
            if (volume.getPersonality() == null) {
                throw APIException.badRequests.srdfVolumeMissingPersonalityAttribute(volume.getId());
            }
            if (volume.getPersonality().equals(Volume.PersonalityTypes.TARGET.toString())) {
                volumeType = VolumeDescriptor.Type.SRDF_TARGET;
            }
            VolumeDescriptor desc = new VolumeDescriptor(volumeType, volume.getStorageController(), volume.getId(), volume.getPool(), null, capabilities, volume.getCapacity());
            descriptors.add(desc);
            // Then it will be returned if accessed by SRDFCopyRecommendation
            if (volumeType == VolumeDescriptor.Type.SRDF_TARGET) {
                // Find the appropriate target
                SRDFRecommendation.Target target = recommendation.getVirtualArrayTargetMap().get(volume.getVirtualArray());
                if (target != null) {
                    List<VolumeDescriptor> targetDescriptors = target.getDescriptors();
                    if (targetDescriptors == null) {
                        targetDescriptors = new ArrayList<VolumeDescriptor>();
                        target.setDescriptors(targetDescriptors);
                    }
                    targetDescriptors.add(desc);
                }
                _log.error("No target recommendation found in the recommendation virtualArrayTargetMap");
            }
            _log.info("Adding Non-Source Volume Descriptor for: " + desc.toString());
        }
    }
    return descriptors;
}

Example 3 with SRDFRecommendation

use of com.emc.storageos.volumecontroller.SRDFRecommendation in project coprhd-controller by CoprHD.

the class AbstractBlockServiceApiImpl method createVolumesAndDescriptors.

@Override
public List<VolumeDescriptor> createVolumesAndDescriptors(List<VolumeDescriptor> descriptors, String name, Long size, Project project, VirtualArray varray, VirtualPool vpool, List<Recommendation> recommendations, TaskList taskList, String task, VirtualPoolCapabilityValuesWrapper vpoolCapabilities) {
    BlockServiceApi api = null;
    List<VolumeDescriptor> volumeDescriptors = new ArrayList<VolumeDescriptor>();
    for (Recommendation recommendation : recommendations) {
        if (recommendation instanceof SRDFRecommendation || recommendation instanceof SRDFCopyRecommendation) {
            api = BlockService.getBlockServiceImpl(DiscoveredDataObject.Type.srdf.name());
        } else if (recommendation instanceof VolumeRecommendation) {
            api = BlockService.getBlockServiceImpl(BlockServiceApi.DEFAULT);
        } else {
            String message = String.format("No BlockServiceApiImpl to handle recommendation of class: ", recommendation.getClass().getName());
            s_logger.error(message);
            throw WorkflowException.exceptions.workflowConstructionError(message);
        }
        volumeDescriptors.addAll(api.createVolumesAndDescriptors(descriptors, name, size, project, varray, vpool, recommendations, taskList, task, vpoolCapabilities));
    }
    return volumeDescriptors;
}

Example 4 with SRDFRecommendation

use of com.emc.storageos.volumecontroller.SRDFRecommendation in project coprhd-controller by CoprHD.

the class VPlexBlockServiceApiImpl method makeBackendVolumeDescriptors.

/**
 * Takes a list of recommendations and makes the backend volumes and volume descriptors needed to
 * provision. When possible (e.g. for SRDF and Block), All recommendations must be in single varray.
 * calls the underlying storage routine createVolumesAndDescriptors().
 *
 * @param recommendations -- a VPlex recommendation list
 * @param project - Project containing the Vplex volumes
 * @param vplexProject -- private project of the Vplex
 * @param rootVpool -- top level Virtual Pool (VpoolUse.ROOT)
 * @param varrayCount -- instance count of the varray being provisioned
 * @param size -- size of each volume
 * @param backendCG -- the CG to be used on the backend Storage Systems
 * @param vPoolCapabilities - a VirtualPoolCapabilityValuesWrapper containing provisioning arguments
 * @param createTask -- boolean if true creates a task
 * @param task -- Overall task id
 * @return -- list of VolumeDescriptors to be provisioned
 */
private List<VolumeDescriptor> makeBackendVolumeDescriptors(List<VPlexRecommendation> recommendations, Project project, Project vplexProject, VirtualPool rootVpool, String volumeLabel, int varrayCount, long size, BlockConsistencyGroup backendCG, VirtualPoolCapabilityValuesWrapper vPoolCapabilities, boolean createTask, String task) {
    VPlexRecommendation firstRecommendation = recommendations.get(0);
    List<VolumeDescriptor> descriptors = new ArrayList<VolumeDescriptor>();
    URI varrayId = firstRecommendation.getVirtualArray();
    VirtualPool vpool = firstRecommendation.getVirtualPool();
    s_logger.info("Generated backend descriptors for {} recommendations varray {}", recommendations.size(), varrayCount);
    vPoolCapabilities.put(VirtualPoolCapabilityValuesWrapper.AUTO_TIER__POLICY_NAME, vpool.getAutoTierPolicyName());
    if (firstRecommendation.getRecommendation() != null) {
        // If these recommendations have lower level recommendation, process them.
        // This path is used for the source side of Distributed Volumes and for Local volumes
        // where we support building on top of SRDF or the BlockStorage as appropriate.
        List<Recommendation> childRecommendations = new ArrayList<Recommendation>();
        Recommendation childRecommendation = null;
        for (VPlexRecommendation recommendation : recommendations) {
            childRecommendation = recommendation.getRecommendation();
            childRecommendations.add(childRecommendation);
        }
        VirtualArray varray = _dbClient.queryObject(VirtualArray.class, varrayId);
        String newVolumeLabel = generateVolumeLabel(volumeLabel, varrayCount, 0, 0);
        boolean srdfTarget = (childRecommendation instanceof SRDFCopyRecommendation);
        boolean srdfSource = (childRecommendation instanceof SRDFRecommendation);
        if (srdfTarget) {
            newVolumeLabel = newVolumeLabel + "-target";
        } else if (srdfSource) {
        } else {
            // nothing special about these volumes, hide them in the vplex project
            // We can't use the vplexProject for SRDF volumes as they determine their RDF group
            // grom the project.
            project = vplexProject;
        }
        TaskList taskList = new TaskList();
        descriptors = super.createVolumesAndDescriptors(descriptors, newVolumeLabel, size, project, varray, vpool, childRecommendations, taskList, task, vPoolCapabilities);
        VolumeDescriptor.Type[] types;
        if (srdfTarget) {
            types = new VolumeDescriptor.Type[] { VolumeDescriptor.Type.SRDF_TARGET };
        } else {
            types = new VolumeDescriptor.Type[] { VolumeDescriptor.Type.BLOCK_DATA, VolumeDescriptor.Type.SRDF_SOURCE, VolumeDescriptor.Type.SRDF_EXISTING_SOURCE };
        }
        descriptors = VolumeDescriptor.filterByType(descriptors, types);
        for (VolumeDescriptor descriptor : descriptors) {
            Volume volume = _dbClient.queryObject(Volume.class, descriptor.getVolumeURI());
            s_logger.info(String.format("Received prepared volume %s (%s, args) type %s", volume.getLabel(), volume.getId(), descriptor.getType().name()));
            volume.addInternalFlags(DataObject.Flag.INTERNAL_OBJECT);
            configureCGAndReplicationGroup(rootVpool, vPoolCapabilities, backendCG, volume);
            _dbClient.updateObject(volume);
        }
        return descriptors;
    }
    // Sum resourceCount across all recommendations
    int totalResourceCount = 0;
    for (VPlexRecommendation recommendation : recommendations) {
        totalResourceCount += recommendation.getResourceCount();
    }
    // The code below is used for the HA side of distributed volumes.
    // The HA side does not currently call the lower level schedulers to get descriptors.
    s_logger.info("Processing recommendations for Virtual Array {}", varrayId);
    int volumeCounter = 0;
    for (VPlexRecommendation recommendation : recommendations) {
        for (int i = 0; i < recommendation.getResourceCount(); i++) {
            vpool = recommendation.getVirtualPool();
            URI storageDeviceURI = recommendation.getSourceStorageSystem();
            URI storagePoolURI = recommendation.getSourceStoragePool();
            String newVolumeLabel = generateVolumeLabel(volumeLabel, varrayCount, volumeCounter, totalResourceCount);
            validateVolumeLabel(newVolumeLabel, project);
            s_logger.info("Volume label is {}", newVolumeLabel);
            VirtualArray varray = _dbClient.queryObject(VirtualArray.class, varrayId);
            // This is also handled in StorageScheduler.prepareRecomendedVolumes
            long thinVolumePreAllocationSize = 0;
            if (null != vpool.getThinVolumePreAllocationPercentage()) {
                thinVolumePreAllocationSize = VirtualPoolUtil.getThinVolumePreAllocationSize(vpool.getThinVolumePreAllocationPercentage(), size);
            }
            Volume volume = prepareVolume(VolumeType.BLOCK_VOLUME, null, size, thinVolumePreAllocationSize, vplexProject, varray, vpool, storageDeviceURI, storagePoolURI, newVolumeLabel, backendCG, vPoolCapabilities);
            configureCGAndReplicationGroup(rootVpool, vPoolCapabilities, backendCG, volume);
            volume.addInternalFlags(Flag.INTERNAL_OBJECT);
            _dbClient.persistObject(volume);
            if (createTask) {
                _dbClient.createTaskOpStatus(Volume.class, volume.getId(), task, ResourceOperationTypeEnum.CREATE_BLOCK_VOLUME);
            }
            s_logger.info("Prepared volume {} ({}) ", volume.getLabel(), volume.getId());
            VolumeDescriptor descriptor = new VolumeDescriptor(VolumeDescriptor.Type.BLOCK_DATA, storageDeviceURI, volume.getId(), storagePoolURI, backendCG == null ? null : backendCG.getId(), vPoolCapabilities, size);
            descriptors.add(descriptor);
            volumeCounter++;
        }
    }
    return descriptors;
}

Example 5 with SRDFRecommendation

use of com.emc.storageos.volumecontroller.SRDFRecommendation in project coprhd-controller by CoprHD.

the class SRDFScheduler method scheduleStorageSourcePoolConstraint.

/**
 * Schedule storage based on the incoming storage pools for source volumes. Find a source
 * storage pool that can provide a source volume that satisfies the vpool's criteria for all
 * targets varrays required and build a recommendation structure to describe the findings.
 *
 * Strategy:
 *
 * 0. When we come into method, we already have a list of candidate source pools, which may be
 * in multiple arrays 1. Get matching pools for each of the target virtual arrays based on the
 * target virtual pool. 2. Make a map of virtual array to potential pools in step 1. 3. Find a
 * pool from each entry in the map that belongs to a storage system that is connected via SRDF
 * (with the same policy) to the specific candidate pool we're looking at. 4. Generate an SRDF
 * Recommendation object that reflects the combination we found.
 *
 * @param varray
 *            varray requested for source
 * @param srdfVarrays
 *            Varray to protect this volume to.
 * @param vpool
 *            vpool requested
 * @param capabilities
 *            parameters
 * @param candidatePools
 *            candidate pools to use for source
 * @param vpoolChangeVolume
 *            vpool change volume, if applicable
 * @return list of Recommendation objects to satisfy the request
 */
private List<Recommendation> scheduleStorageSourcePoolConstraint(final VirtualArray varray, final Project project, final VirtualPool vpool, final VirtualPoolCapabilityValuesWrapper capabilities, final List<StoragePool> candidatePools, final Volume vpoolChangeVolume, final URI consistencyGroupUri) {
    // Initialize a list of recommendations to be returned.
    List<Recommendation> recommendations = new ArrayList<Recommendation>();
    if (capabilities.getResourceCount() == 1) {
        // For single resource request, select storage pool randomly from all candidate pools
        // (to minimize collisions).
        Collections.shuffle(candidatePools);
    } else {
        // Sort all pools in descending order by free capacity (first order) and in ascending
        // order by ratio
        // of pool's subscribed capacity to total capacity(suborder). This order is kept through
        // the selection procedure.
        _blockScheduler.sortPools(candidatePools);
    }
    List<VirtualArray> targetVarrays = getTargetVirtualArraysForVirtualPool(project, vpool, _dbClient, _permissionsHelper);
    // Attempt to use these pools for selection based on target
    StringBuffer sb = new StringBuffer("Determining if SRDF is possible from " + varray.getId() + " to: ");
    for (VirtualArray targetVarray : targetVarrays) {
        sb.append(targetVarray.getId()).append(" ");
    }
    _log.info(sb.toString());
    // The port group provided is belongs to SRDF source storage system.
    // If port group set in capabilities, ViPR looks storage pools from given PG's storage system only
    // Need to remove PORT_GROUP entry from capabilities for SRDF target volume,
    // so that ViPR picks SRDF target storage pools from right storage system.
    // 
    capabilities.removeCapabilityEntry(VirtualPoolCapabilityValuesWrapper.PORT_GROUP);
    Map<String, Object> attributeMap = new HashMap<String, Object>();
    Map<VirtualArray, List<StoragePool>> varrayPoolMap = getMatchingPools(targetVarrays, vpool, capabilities, attributeMap);
    if (varrayPoolMap == null || varrayPoolMap.isEmpty()) {
        // No matching storage pools found for any of the target varrays. There are no target
        // storage pools that match the passed vpool parameters and protocols and/or there are
        // no pools that have enough
        // capacity to hold at least one resource of the requested size.
        Set<String> tmpTargetVarrays = new HashSet<String>();
        sb = new StringBuffer("No matching storage pools found for any of the target varrays: [ ");
        for (VirtualArray targetVarray : targetVarrays) {
            sb.append(targetVarray.getId()).append(" ");
            tmpTargetVarrays.add(targetVarray.getLabel());
        }
        sb.append("]. There are no storage pools that match the passed vpool parameters and protocols and/or " + "there are no pools that have enough capacity to hold at least one resource of the requested size.");
        StringBuffer errorMessage = new StringBuffer();
        if (attributeMap.get(AttributeMatcher.ERROR_MESSAGE) != null) {
            errorMessage = (StringBuffer) attributeMap.get(AttributeMatcher.ERROR_MESSAGE);
        }
        _log.error(sb.toString());
        throw APIException.badRequests.noMatchingRecoverPointStoragePoolsForVpoolAndVarrays(vpool.getLabel(), tmpTargetVarrays, errorMessage.toString());
    }
    // Reduce the source and target pool down to the pools available via target.
    Set<SRDFPoolMapping> tmpDestPoolsList = getSRDFPoolMappings(varray, candidatePools, varrayPoolMap, vpool, vpoolChangeVolume, capabilities.getSize());
    if (tmpDestPoolsList == null || tmpDestPoolsList.isEmpty()) {
        // There are no target pools from any of the target varrays that share the
        // same SRDF connectivity as any of the source varray pools. Placement cannot
        // be achieved.
        Set<String> tmpSRDFVarrays = new HashSet<String>();
        sb = new StringBuffer("No matching target pool found for varray: ");
        sb.append(varray.getId());
        sb.append(" and vpool: ");
        sb.append(vpool.getId());
        sb.append(" to varrays: ");
        for (VirtualArray targetVarray : targetVarrays) {
            sb.append(targetVarray.getId()).append(" ");
            tmpSRDFVarrays.add(targetVarray.getLabel());
        }
        // No matching target pool found for varray so throw an exception
        // indicating a placement error.
        _log.error(sb.toString());
        throw APIException.badRequests.noMatchingSRDFPools(varray.getLabel(), vpool.getLabel(), tmpSRDFVarrays);
    }
    // Fire business rules to determine which SRDFPoolMappings can be eliminated
    // from consideration for placement.
    Set<SRDFPoolMapping> srcDestPoolsList = fireSRDFPlacementRules(tmpDestPoolsList, capabilities.getResourceCount());
    // the volume request configuration throw an exception.
    if (srcDestPoolsList == null || srcDestPoolsList.isEmpty()) {
        throw APIException.badRequests.srdfNoSolutionsFoundError();
    }
    // Get a new source pool list for pool selection
    Set<StoragePool> sourceCandidatePoolList = new HashSet<StoragePool>();
    for (SRDFPoolMapping srdfPoolMapping : srcDestPoolsList) {
        sourceCandidatePoolList.add(srdfPoolMapping.sourceStoragePool);
    }
    // Try with the storagePoolList as it currently is.
    // If we get through the process and couldn't achieve full target, we should
    // take out the matched pool from the storagePoolList and try again.
    List<StoragePool> sourcePoolList = new ArrayList<StoragePool>();
    sourcePoolList.addAll(sourceCandidatePoolList);
    // We need to create recommendations for one or more pools
    // that can accommodate the number of requested resources.
    // We start by trying to place all resources in a single
    // pool if one exists that can accommodate all requested
    // resources and work our way down as necessary trying to
    // minimize the number of pools used to satisfy the request.
    int recommendedCount = 0;
    int currentCount = capabilities.getResourceCount();
    // satisfied all of the requests.
    while (!sourcePoolList.isEmpty() && recommendedCount < capabilities.getResourceCount()) {
        // This request will either decrement the count OR shrink the sourcePoolList
        // In the case of decrementing the count, it's because it was successful at
        // placing volume(s). If it wasn't, that source pool goes in the trash and we
        // try the next one.
        long resourceSize = capabilities.getSize();
        int resourceCount = capabilities.getResourceCount();
        // We need to find a pool that matches the capacity for all the source/target luns
        long requiredPoolCapacity = resourceSize * currentCount;
        _log.info("Required pool capacity: " + requiredPoolCapacity);
        StoragePool poolWithRequiredCapacity = _blockScheduler.getPoolMatchingCapacity(requiredPoolCapacity, resourceSize, currentCount, sourcePoolList, VirtualPool.ProvisioningType.Thin.toString().equalsIgnoreCase(vpool.getSupportedProvisioningType()), null);
        // pool, setting the resource count for that recommendation.
        if (poolWithRequiredCapacity != null) {
            StoragePool recommendedPool = poolWithRequiredCapacity;
            _log.debug("Recommending storage pool {} for {} resources.", recommendedPool.getId(), currentCount);
            // Now we know what pool was selected, we can grab the target pools that jive with that
            // source
            Map<VirtualArray, List<StoragePool>> targetVarrayPoolMap = findDestPoolsForSourcePool(targetVarrays, srcDestPoolsList, recommendedPool, vpool);
            if (targetVarrayPoolMap == null || targetVarrayPoolMap.isEmpty()) {
                // A valid source pool was found but there are no pools from any of the
                // target varrays that can protect it.
                _log.info("There are no pools from any of the target varrays that can protect the source " + "varray pool {}.  Will try using another source varray pool.", recommendedPool.getLabel());
                // Remove the source pool and try the next one.
                sourcePoolList.remove(poolWithRequiredCapacity);
            } else {
                // A single recommendation object will create a set of volumes for an SRDF pair.
                SRDFRecommendation rec = new SRDFRecommendation();
                // For each target varray, we start the process of matching source and destination
                // pools to one storage system.
                Map<VirtualArray, Set<StorageSystem>> varrayTargetDeviceMap = new HashMap<VirtualArray, Set<StorageSystem>>();
                for (VirtualArray targetVarray1 : targetVarrayPoolMap.keySet()) {
                    if (rec.getSourceStoragePool() == null) {
                        rec.setVirtualArray(varray.getId());
                        rec.setVirtualPool(vpool);
                        rec.setSourceStoragePool(recommendedPool.getId());
                        rec.setResourceCount(currentCount);
                        rec.setSourceStorageSystem(recommendedPool.getStorageDevice());
                        rec.setVirtualArrayTargetMap(new HashMap<URI, Target>());
                        rec.setVpoolChangeVolume(vpoolChangeVolume != null ? vpoolChangeVolume.getId() : null);
                        rec.setVpoolChangeVpool(vpoolChangeVolume != null ? vpool.getId() : null);
                    }
                    if (targetVarrayPoolMap.get(targetVarray1) == null || targetVarrayPoolMap.get(targetVarray1).isEmpty()) {
                        _log.error("Could not find any suitable storage pool for target varray: " + targetVarray1.getLabel());
                        throw APIException.badRequests.unableToFindSuitablePoolForTargetVArray(targetVarray1.getLabel());
                    }
                    // Select the destination pool based on what was selected as source
                    StoragePool destinationPool = _blockScheduler.selectPool(targetVarrayPoolMap.get(targetVarray1));
                    _log.info("Destination target for varray " + targetVarray1.getLabel() + " was determined to be in pool: " + destinationPool.getLabel());
                    Target target = new Target();
                    target.setTargetPool(destinationPool.getId());
                    target.setTargetStorageDevice(destinationPool.getStorageDevice());
                    // Set the copy mode
                    Map<URI, VpoolRemoteCopyProtectionSettings> settingsMap = VirtualPool.getRemoteProtectionSettings(vpool, _dbClient);
                    target.setCopyMode(settingsMap.get(targetVarray1.getId()).getCopyMode());
                    if (target.getCopyMode() == null) {
                        // Set the default if not set
                        target.setCopyMode(RemoteDirectorGroup.SupportedCopyModes.ASYNCHRONOUS.toString());
                    }
                    // Generate a list of storage systems that match the src and dest pools lists.
                    Set<StorageSystem> targetDeviceList = findMatchingSRDFPools(targetVarray1, srcDestPoolsList, recommendedPool, destinationPool);
                    if (targetDeviceList.isEmpty()) {
                        _log.error("Could not find a Storage pool for target varray: " + targetVarray1.getLabel());
                        throw APIException.badRequests.unableToFindSuitablePoolForTargetVArray(targetVarray1.getLabel());
                    }
                    rec.getVirtualArrayTargetMap().put(targetVarray1.getId(), target);
                    // Add this potential solution to the map.
                    varrayTargetDeviceMap.put(targetVarray1, targetDeviceList);
                }
                // Grab any element since all varrays need to have the same SRDF connectivity.
                VirtualArray firstVarray = null;
                for (VirtualArray baseVarray : varrayTargetDeviceMap.keySet()) {
                    firstVarray = baseVarray;
                    break;
                }
                _log.info("Chose the first varray for SRDF comparison: " + firstVarray.getLabel());
                // Now go through each storage system in this varray and see if it matches up
                findInsertRecommendation(rec, firstVarray, recommendations, candidatePools, recommendedPool, varrayTargetDeviceMap, project, consistencyGroupUri);
                // Update the count of resources for which we have created
                // a recommendation.
                recommendedCount += currentCount;
                // Update the current count. The conditional prevents
                // unnecessary attempts to look for pools of a given
                // free capacity that we already know don't exist. For
                // example, say we want 100 resources and the first pool
                // we find that can hold multiple resources can hold only
                // 10. We don't want to continue looking for pools that
                // can hold 90,89,88,...11 resources. We just want to
                // see if there is another pool that can hold 10 resources,
                // then 9,8, and so on.
                currentCount = resourceCount - recommendedCount < currentCount ? resourceCount - recommendedCount : currentCount;
            }
        } else {
            // If we can't find a pool that can hold the current
            // count of resources, decrease the count so that we look
            // for pools that can hold the next smaller number.
            currentCount--;
            // Clear out the source pool list (which will cause failure)
            sourcePoolList.clear();
        }
        // log an error and clear the list of recommendations.
        if (recommendedCount != resourceCount) {
            _log.error("Could not find matching pools for varray {} & vpool {}", varray.getId(), vpool.getId());
            recommendations.clear();
            // Remove the pool we chose from the list so we can try again.
            sourcePoolList.remove(poolWithRequiredCapacity);
        }
    }
    return recommendations;
}