diff --git a/Cargo.lock b/Cargo.lock
index f023fe0..bc9c367 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -160,7 +160,7 @@ dependencies = [
 
 [[package]]
 name = "dragonfly-api"
-version = "2.0.123"
+version = "2.0.124"
 dependencies = [
  "prost 0.11.9",
  "prost-types 0.12.6",
diff --git a/Cargo.toml b/Cargo.toml
index ec99c1e..f3bc44c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "dragonfly-api"
-version = "2.0.123"
+version = "2.0.124"
 authors = ["Gaius <gaius.qi@gmail.com>"]
 edition = "2021"
 license = "Apache-2.0"
diff --git a/pkg/apis/dfdaemon/v2/dfdaemon.pb.go b/pkg/apis/dfdaemon/v2/dfdaemon.pb.go
index a14e7f2..05548f7 100644
--- a/pkg/apis/dfdaemon/v2/dfdaemon.pb.go
+++ b/pkg/apis/dfdaemon/v2/dfdaemon.pb.go
@@ -731,16 +731,20 @@ type DownloadCacheTaskRequest struct {
 	HostId string `protobuf:"bytes,1,opt,name=host_id,json=hostId,proto3" json:"host_id,omitempty"`
 	// Task id.
 	TaskId string `protobuf:"bytes,2,opt,name=task_id,json=taskId,proto3" json:"task_id,omitempty"`
+	// Persistent represents whether the cache task is persistent.
+	// If the cache task is persistent, the cache peer will
+	// not be deleted when dfdamon runs garbage collection.
+	Persistent bool `protobuf:"varint,3,opt,name=persistent,proto3" json:"persistent,omitempty"`
 	// Tag is used to distinguish different cache tasks.
-	Tag *string `protobuf:"bytes,3,opt,name=tag,proto3,oneof" json:"tag,omitempty"`
+	Tag *string `protobuf:"bytes,4,opt,name=tag,proto3,oneof" json:"tag,omitempty"`
 	// Application of task.
-	Application *string `protobuf:"bytes,4,opt,name=application,proto3,oneof" json:"application,omitempty"`
+	Application *string `protobuf:"bytes,5,opt,name=application,proto3,oneof" json:"application,omitempty"`
 	// Task piece length.
-	PieceLength uint64 `protobuf:"varint,5,opt,name=piece_length,json=pieceLength,proto3" json:"piece_length,omitempty"`
+	PieceLength uint64 `protobuf:"varint,6,opt,name=piece_length,json=pieceLength,proto3" json:"piece_length,omitempty"`
 	// File path to be exported.
-	OutputPath string `protobuf:"bytes,6,opt,name=output_path,json=outputPath,proto3" json:"output_path,omitempty"`
+	OutputPath string `protobuf:"bytes,7,opt,name=output_path,json=outputPath,proto3" json:"output_path,omitempty"`
 	// Download timeout.
-	Timeout *durationpb.Duration `protobuf:"bytes,7,opt,name=timeout,proto3,oneof" json:"timeout,omitempty"`
+	Timeout *durationpb.Duration `protobuf:"bytes,8,opt,name=timeout,proto3,oneof" json:"timeout,omitempty"`
 }
 
 func (x *DownloadCacheTaskRequest) Reset() {
@@ -789,6 +793,13 @@ func (x *DownloadCacheTaskRequest) GetTaskId() string {
 	return ""
 }
 
+func (x *DownloadCacheTaskRequest) GetPersistent() bool {
+	if x != nil {
+		return x.Persistent
+	}
+	return false
+}
+
 func (x *DownloadCacheTaskRequest) GetTag() string {
 	if x != nil && x.Tag != nil {
 		return *x.Tag
@@ -1282,23 +1293,25 @@ var file_pkg_apis_dfdaemon_v2_dfdaemon_proto_rawDesc = []byte{
 	0x06, 0x74, 0x61, 0x73, 0x6b, 0x49, 0x64, 0x22, 0x35, 0x0a, 0x11, 0x44, 0x65, 0x6c, 0x65, 0x74,
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 	0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x44, 0x75, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x48,
 	0x02, 0x52, 0x07, 0x74, 0x69, 0x6d, 0x65, 0x6f, 0x75, 0x74, 0x88, 0x01, 0x01, 0x42, 0x06, 0x0a,
diff --git a/pkg/apis/dfdaemon/v2/dfdaemon.pb.validate.go b/pkg/apis/dfdaemon/v2/dfdaemon.pb.validate.go
index fdf2343..0a87e10 100644
--- a/pkg/apis/dfdaemon/v2/dfdaemon.pb.validate.go
+++ b/pkg/apis/dfdaemon/v2/dfdaemon.pb.validate.go
@@ -1650,6 +1650,8 @@ func (m *DownloadCacheTaskRequest) validate(all bool) error {
 		errors = append(errors, err)
 	}
 
+	// no validation rules for Persistent
+
 	if m.GetPieceLength() < 1 {
 		err := DownloadCacheTaskRequestValidationError{
 			field:  "PieceLength",
diff --git a/pkg/apis/dfdaemon/v2/dfdaemon.proto b/pkg/apis/dfdaemon/v2/dfdaemon.proto
index 7631850..5ae1c5c 100644
--- a/pkg/apis/dfdaemon/v2/dfdaemon.proto
+++ b/pkg/apis/dfdaemon/v2/dfdaemon.proto
@@ -131,16 +131,20 @@ message DownloadCacheTaskRequest {
   string host_id = 1 [(validate.rules).string.min_len = 1];
   // Task id.
   string task_id = 2 [(validate.rules).string.min_len = 1];
+  // Persistent represents whether the cache task is persistent.
+  // If the cache task is persistent, the cache peer will
+  // not be deleted when dfdamon runs garbage collection.
+  bool persistent = 3;
   // Tag is used to distinguish different cache tasks.
-  optional string tag = 3;
+  optional string tag = 4;
   // Application of task.
-  optional string application = 4;
+  optional string application = 5;
   // Task piece length.
-  uint64 piece_length = 5 [(validate.rules).uint64.gte = 1];
+  uint64 piece_length = 6 [(validate.rules).uint64.gte = 1];
   // File path to be exported.
-  string output_path = 6 [(validate.rules).string.min_len = 1];
+  string output_path = 7 [(validate.rules).string.min_len = 1];
   // Download timeout.
-  optional google.protobuf.Duration timeout = 7;
+  optional google.protobuf.Duration timeout = 8;
 }
 
 // DownloadCacheTaskStartedResponse represents task download started response of DownloadCacheTaskResponse.
diff --git a/proto/dfdaemon.proto b/proto/dfdaemon.proto
index ad5d8dc..f5fdcd5 100644
--- a/proto/dfdaemon.proto
+++ b/proto/dfdaemon.proto
@@ -120,16 +120,20 @@ message DownloadCacheTaskRequest {
   string host_id = 1;
   // Task id.
   string task_id = 2;
+  // Persistent represents whether the cache task is persistent.
+  // If the cache task is persistent, the cache peer will
+  // not be deleted when dfdamon runs garbage collection.
+  bool persistent = 3;
   // Tag is used to distinguish different cache tasks.
-  optional string tag = 3;
+  optional string tag = 4;
   // Application of task.
-  optional string application = 4;
+  optional string application = 5;
   // Task piece length.
-  uint64 piece_length = 5;
+  uint64 piece_length = 6;
   // File path to be exported.
-  string output_path = 6;
+  string output_path = 7;
   // Download timeout.
-  optional google.protobuf.Duration timeout = 7;
+  optional google.protobuf.Duration timeout = 8;
 }
 
 // DownloadCacheTaskStartedResponse represents task download started response of DownloadCacheTaskResponse.
diff --git a/src/descriptor.bin b/src/descriptor.bin
index 1e7b6e1..c2a03da 100644
Binary files a/src/descriptor.bin and b/src/descriptor.bin differ
diff --git a/src/dfdaemon.v2.rs b/src/dfdaemon.v2.rs
index 34afc12..0455968 100644
--- a/src/dfdaemon.v2.rs
+++ b/src/dfdaemon.v2.rs
@@ -151,20 +151,25 @@ pub struct DownloadCacheTaskRequest {
     /// Task id.
     #[prost(string, tag = "2")]
     pub task_id: ::prost::alloc::string::String,
+    /// Persistent represents whether the cache task is persistent.
+    /// If the cache task is persistent, the cache peer will
+    /// not be deleted when dfdamon runs garbage collection.
+    #[prost(bool, tag = "3")]
+    pub persistent: bool,
     /// Tag is used to distinguish different cache tasks.
-    #[prost(string, optional, tag = "3")]
+    #[prost(string, optional, tag = "4")]
     pub tag: ::core::option::Option<::prost::alloc::string::String>,
     /// Application of task.
-    #[prost(string, optional, tag = "4")]
+    #[prost(string, optional, tag = "5")]
     pub application: ::core::option::Option<::prost::alloc::string::String>,
     /// Task piece length.
-    #[prost(uint64, tag = "5")]
+    #[prost(uint64, tag = "6")]
     pub piece_length: u64,
     /// File path to be exported.
-    #[prost(string, tag = "6")]
+    #[prost(string, tag = "7")]
     pub output_path: ::prost::alloc::string::String,
     /// Download timeout.
-    #[prost(message, optional, tag = "7")]
+    #[prost(message, optional, tag = "8")]
     pub timeout: ::core::option::Option<::prost_wkt_types::Duration>,
 }
 /// DownloadCacheTaskStartedResponse represents task download started response of DownloadCacheTaskResponse.