DaanHoogland commented on a change in pull request #5249:
URL: https://github.com/apache/cloudstack/pull/5249#discussion_r679004476



##########
File path: 
server/src/main/java/com/cloud/deploy/DeploymentPlanningManagerImpl.java
##########
@@ -1674,7 +1675,12 @@ protected boolean hostCanAccessSPool(Host host, 
StoragePool pool) {
             for (StoragePoolAllocator allocator : _storagePoolAllocators) {
                 final List<StoragePool> suitablePools = 
allocator.allocateToPool(diskProfile, vmProfile, plan, avoid, returnUpTo);
                 if (suitablePools != null && !suitablePools.isEmpty()) {
-                    suitableVolumeStoragePools.put(toBeCreated, suitablePools);
+                    List<StoragePool> pools = new ArrayList<>();
+                    Optional<StoragePool> storagePool = 
getPreferredStoragePool(suitablePools, vmProfile.getVirtualMachine());
+                    storagePool.ifPresent(pools::add);
+
+                    pools.addAll(suitablePools);
+                    suitableVolumeStoragePools.put(toBeCreated, pools);

Review comment:
       can you extract this bit as to not enlarge an already too long method, 
please?

##########
File path: 
engine/orchestration/src/main/java/org/apache/cloudstack/engine/orchestration/VolumeOrchestrator.java
##########
@@ -321,9 +347,13 @@ public StoragePool findStoragePool(DiskProfile dskCh, 
DataCenter dc, Pod pod, Lo
             }
             DataCenterDeployment plan = new DataCenterDeployment(dc.getId(), 
podId, clusterId, hostId, null, null);
 
-            final List<StoragePool> poolList = allocator.allocateToPool(dskCh, 
profile, plan, avoidList, 1);
+            final List<StoragePool> poolList = allocator.allocateToPool(dskCh, 
profile, plan, avoidList, StoragePoolAllocator.RETURN_UPTO_ALL);
             if (poolList != null && !poolList.isEmpty()) {
-                return 
(StoragePool)dataStoreMgr.getDataStore(poolList.get(0).getId(), 
DataStoreRole.Primary);
+                // Check if the preferred storage pool can be used. If yes, 
use it.
+                Optional<StoragePool> storagePool = 
getPreferredStoragePool(poolList, vm);
+
+                return (storagePool.isPresent()) ? (StoragePool) 
this.dataStoreMgr.getDataStore(storagePool.get().getId(), 
DataStoreRole.Primary) :
+                    
(StoragePool)dataStoreMgr.getDataStore(poolList.get(0).getId(), 
DataStoreRole.Primary);

Review comment:
       can you extract this into a `private StoragePool 
checkPreferredStorageForUse(..)` and than store the result in a `StoragePool 
poolToReturn = null;` so we have only one exit point. I.E. end the method with 
`return poolToReturn`




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