[vmware, ssvm] Scale down of ssvm (apache#6042)

* [vmware, ssvm] Scale down of ssvm

* address comments - change variable name

Author: Pearl1594

engine/components-api/src/main/java/com/cloud/storage/StorageManager.java

@@ -143,6 +143,9 @@ public interface StorageManager extends StorageService {
     ConfigKey<Integer>  SecStorageMaxMigrateSessions = new ConfigKey<Integer>("Advanced", Integer.class, "secstorage.max.migrate.sessions", "2",
             "The max number of concurrent copy command execution sessions that an SSVM can handle", false, ConfigKey.Scope.Global);
 
+    ConfigKey<Boolean>  SecStorageVMAutoScaleDown = new ConfigKey<Boolean>("Advanced", Boolean.class, "secstorage.vm.auto.scale.down", "false",
+            "Setting this to 'true' will auto scale down SSVMs", true, ConfigKey.Scope.Global);
+
     ConfigKey<Integer> MaxDataMigrationWaitTime = new ConfigKey<Integer>("Advanced", Integer.class, "max.data.migration.wait.time", "15",
             "Maximum wait time for a data migration task before spawning a new SSVM", false, ConfigKey.Scope.Global);
     ConfigKey<Boolean> DiskProvisioningStrictness = new ConfigKey<Boolean>("Storage", Boolean.class, "disk.provisioning.type.strictness", "false",

server/src/main/java/com/cloud/storage/StorageManagerImpl.java

@@ -3331,7 +3331,8 @@ public ConfigKey<?>[] getConfigKeys() {
                 SecStorageMaxMigrateSessions,
                 MaxDataMigrationWaitTime,
                 DiskProvisioningStrictness,
-                PreferredStoragePool
+                PreferredStoragePool,
+                SecStorageVMAutoScaleDown
         };
     }
 

services/secondary-storage/controller/src/main/java/org/apache/cloudstack/secondarystorage/PremiumSecondaryStorageManagerImpl.java

@@ -184,7 +184,9 @@ else if (!copyCmdsInPipeline.isEmpty()  && copyCmdsInPipeline.size() >= halfLimi
             return new Pair<AfterScanAction, Object>(AfterScanAction.expand, SecondaryStorageVm.Role.commandExecutor);
 
         }
-        scaleDownSSVMOnLoad(alreadyRunning, activeCmds, copyCmdsInPipeline);
+        if (StorageManager.SecStorageVMAutoScaleDown.value()) {
+            scaleDownSSVMOnLoad(alreadyRunning, activeCmds, copyCmdsInPipeline);
+        }
         return new Pair<AfterScanAction, Object>(AfterScanAction.nop, null);
     }