diff --git a/pkgs/ioswitch/plan/generate.go b/pkgs/ioswitch/plan/generate.go
index 6a7362b..e627cbe 100644
--- a/pkgs/ioswitch/plan/generate.go
+++ b/pkgs/ioswitch/plan/generate.go
@@ -4,7 +4,6 @@ import (
 	"gitlink.org.cn/cloudream/common/pkgs/ioswitch/dag"
 	"gitlink.org.cn/cloudream/common/pkgs/ioswitch/exec"
 	"gitlink.org.cn/cloudream/common/pkgs/ioswitch/plan/ops"
-	"gitlink.org.cn/cloudream/storage/common/pkgs/ioswitch"
 )
 
 func Generate(graph *dag.Graph, planBld *exec.PlanBuilder) error {
@@ -24,11 +23,11 @@ func generateSend(graph *dag.Graph) {
 			switch to.Node.Env.Type {
 			case dag.EnvDriver:
 				// // 如果是要送到Driver，则只能由Driver主动去拉取
-				getNode := graph.NewNode(&ops.GetStreamType{}, ioswitch.NodeProps{})
+				getNode := graph.NewNode(&ops.GetStreamType{}, nil)
 				getNode.Env.ToEnvDriver()
 
 				// // 同时需要对此变量生成HoldUntil指令，避免Plan结束时Get指令还未到达
-				holdNode := graph.NewNode(&ops.HoldUntilType{}, ioswitch.NodeProps{})
+				holdNode := graph.NewNode(&ops.HoldUntilType{}, nil)
 				holdNode.Env = node.Env
 
 				// 将Get指令的信号送到Hold指令
@@ -43,7 +42,7 @@ func generateSend(graph *dag.Graph) {
 
 			case dag.EnvWorker:
 				// 如果是要送到Agent，则可以直接发送
-				n := graph.NewNode(&ops.SendStreamType{}, ioswitch.NodeProps{})
+				n := graph.NewNode(&ops.SendStreamType{}, nil)
 				n.Env = node.Env
 				n.OutputStreams[0].To(to.Node, to.SlotIndex)
 				out.Toes = nil
@@ -60,11 +59,11 @@ func generateSend(graph *dag.Graph) {
 			switch to.Node.Env.Type {
 			case dag.EnvDriver:
 				// // 如果是要送到Driver，则只能由Driver主动去拉取
-				getNode := graph.NewNode(&ops.GetVaType{}, ioswitch.NodeProps{})
+				getNode := graph.NewNode(&ops.GetVaType{}, nil)
 				getNode.Env.ToEnvDriver()
 
 				// // 同时需要对此变量生成HoldUntil指令，避免Plan结束时Get指令还未到达
-				holdNode := graph.NewNode(&ops.HoldUntilType{}, ioswitch.NodeProps{})
+				holdNode := graph.NewNode(&ops.HoldUntilType{}, nil)
 				holdNode.Env = node.Env
 
 				// 将Get指令的信号送到Hold指令
@@ -79,7 +78,7 @@ func generateSend(graph *dag.Graph) {
 
 			case dag.EnvWorker:
 				// 如果是要送到Agent，则可以直接发送
-				n := graph.NewNode(&ops.SendVarType{}, ioswitch.NodeProps{})
+				n := graph.NewNode(&ops.SendVarType{}, nil)
 				n.Env = node.Env
 				n.OutputValues[0].To(to.Node, to.SlotIndex)
 				out.Toes = nil
diff --git a/sdks/storage/models.go b/sdks/storage/models.go
index 9a79cd6..c07d95f 100644
--- a/sdks/storage/models.go
+++ b/sdks/storage/models.go
@@ -37,6 +37,7 @@ var RedundancyUnion = serder.UseTypeUnionInternallyTagged(types.Ref(types.NewTyp
 	(*NoneRedundancy)(nil),
 	(*RepRedundancy)(nil),
 	(*ECRedundancy)(nil),
+	(*LRCRedundancy)(nil),
 )), "type")
 
 type NoneRedundancy struct {
@@ -93,6 +94,42 @@ func (b *ECRedundancy) Value() (driver.Value, error) {
 	return serder.ObjectToJSONEx[Redundancy](b)
 }
 
+var DefaultLRCRedundancy = *NewLRCRedundancy(3, 2, []int{2}, 1024*1024*5)
+
+type LRCRedundancy struct {
+	serder.Metadata `union:"lrc"`
+	Type            string `json:"type"`
+	K               int    `json:"k"`
+	N               int    `json:"n"`
+	Groups          []int  `json:"groups"`
+	ChunkSize       int    `json:"chunkSize"`
+}
+
+func NewLRCRedundancy(k int, n int, groups []int, chunkSize int) *LRCRedundancy {
+	return &LRCRedundancy{
+		Type:      "lrc",
+		K:         k,
+		N:         n,
+		Groups:    groups,
+		ChunkSize: chunkSize,
+	}
+}
+func (b *LRCRedundancy) Value() (driver.Value, error) {
+	return serder.ObjectToJSONEx[Redundancy](b)
+}
+
+// 判断指定块属于哪个组。如果都不属于，则返回-1。
+func (b *LRCRedundancy) FindGroup(idx int) int {
+	for i, group := range b.Groups {
+		if idx < group {
+			return i
+		}
+		idx -= group
+	}
+
+	return -1
+}
+
 const (
 	PackageStateNormal  = "Normal"
 	PackageStateDeleted = "Deleted"