diff --git a/pkg/scheduler/algorithm/predicates/disk_schedtag_predicate.go b/pkg/scheduler/algorithm/predicates/disk_schedtag_predicate.go
index 7a027d3277..fe91914fa6 100644
--- a/pkg/scheduler/algorithm/predicates/disk_schedtag_predicate.go
+++ b/pkg/scheduler/algorithm/predicates/disk_schedtag_predicate.go
@@ -148,6 +148,20 @@ func (p *DiskSchedtagPredicate) IsResourceFitInput(ctx context.Context, u *core.
 		}
 	}
 
+	// free capacity check
+	if storage.FreeCapacity < int64(d.SizeMb) {
+		return &FailReason{
+			Reason: fmt.Sprintf("Storage %s free capacity %d < %d(request)", storage.Name, storage.FreeCapacity, d.SizeMb),
+			Type:   StorageOwnership,
+		}
+	}
+	if storage.ActualFreeCapacity < int64(d.SizeMb) {
+		return &FailReason{
+			Reason: fmt.Sprintf("Storage %s actual free capacity %d < %d(request)", storage.Name, storage.ActualFreeCapacity, d.SizeMb),
+			Type:   StorageOwnership,
+		}
+	}
+
 	return nil
 }
 
diff --git a/pkg/scheduler/api/types.go b/pkg/scheduler/api/types.go
index d9663c05cd..28c38f6fe5 100644
--- a/pkg/scheduler/api/types.go
+++ b/pkg/scheduler/api/types.go
@@ -95,8 +95,9 @@ func SchedtagStrategyCheck(strategy string) (err error) {
 
 type CandidateStorage struct {
 	*models.SStorage
-	Schedtags    []models.SSchedtag `json:"schedtags"`
-	FreeCapacity int64              `json:"free_capacity"`
+	Schedtags          []models.SSchedtag `json:"schedtags"`
+	FreeCapacity       int64              `json:"free_capacity"`
+	ActualFreeCapacity int64              `json:"actual_free_capacity"`
 }
 
 type CandidateNetwork struct {
diff --git a/pkg/scheduler/cache/candidate/base.go b/pkg/scheduler/cache/candidate/base.go
index f25fa246d1..dd1d22233a 100644
--- a/pkg/scheduler/cache/candidate/base.go
+++ b/pkg/scheduler/cache/candidate/base.go
@@ -677,9 +677,10 @@ func (b *BaseHostDesc) fillStorages(host *computemodels.SHost) error {
 	for _, s := range host.GetHoststorages() {
 		storage := s.GetStorage()
 		ss = append(ss, &api.CandidateStorage{
-			SStorage:     storage,
-			FreeCapacity: storage.GetFreeCapacity(),
-			Schedtags:    storage.GetSchedtags(),
+			SStorage:           storage,
+			FreeCapacity:       storage.GetFreeCapacity(),
+			ActualFreeCapacity: storage.Capacity - storage.ActualCapacityUsed,
+			Schedtags:          storage.GetSchedtags(),
 		})
 	}
 	b.Storages = ss
diff --git a/pkg/scheduler/cache/candidate/hosts.go b/pkg/scheduler/cache/candidate/hosts.go
index 1039697765..2aff4cab78 100644
--- a/pkg/scheduler/cache/candidate/hosts.go
+++ b/pkg/scheduler/cache/candidate/hosts.go
@@ -328,7 +328,7 @@ func (h *HostDesc) freeStorageSizeOfType(storageType string, useRsvd bool) (int6
 	for _, storage := range h.Storages {
 		if storage.StorageType == storageType {
 			total += int64(storage.FreeCapacity)
-			actualTotal += storage.Capacity - storage.ActualCapacityUsed
+			actualTotal += int64(storage.ActualFreeCapacity)
 		}
 	}
 	if utils.IsLocalStorage(storageType) {