diff --git a/apis/io-engine/protobuf/v1/common.proto b/apis/io-engine/protobuf/v1/common.proto
index 3f0d3d5..fc6d804 100644
--- a/apis/io-engine/protobuf/v1/common.proto
+++ b/apis/io-engine/protobuf/v1/common.proto
@@ -7,3 +7,8 @@ enum ShareProtocol {
   NVMF = 1; // NVMe over Fabrics (TCP)
   ISCSI = 2; // iSCSI
 }
+
+message ResizeContext {
+  uint64 requested_size = 1;
+  uint32 status_code = 2;
+}
diff --git a/apis/io-engine/protobuf/v1/replica.proto b/apis/io-engine/protobuf/v1/replica.proto
index 65598d3..3bb71fe 100644
--- a/apis/io-engine/protobuf/v1/replica.proto
+++ b/apis/io-engine/protobuf/v1/replica.proto
@@ -15,6 +15,7 @@ service ReplicaRpc {
   rpc ListReplicas (ListReplicaOptions) returns (ListReplicasResponse) {}
   rpc ShareReplica (ShareReplicaRequest) returns (Replica) {}
   rpc UnshareReplica (UnshareReplicaRequest) returns (Replica) {}
+  rpc ResizeReplica (ResizeReplicaRequest) returns (ResizeReplicaResponse) {}
 }
 
 // Replica space usage
@@ -78,11 +79,24 @@ message UnshareReplicaRequest {
   string uuid = 1;  // uuid of the replica
 }
 
+// Resize(expand or shrink) a replica. Only valid for normal lvol
+// replicas, and not lvols that are a snapshot.
+message ResizeReplicaRequest {
+  string uuid = 1;  // uuid of the replica.
+  uint64 requested_size = 2; // indicates the requested new size of replica.
+}
+
 // List of replicas and their properties.
 message ListReplicasResponse {
   repeated Replica replicas = 1;  // list of the replicas
 }
 
+// Response containing updated replica information and result.
+message ResizeReplicaResponse {
+  Replica replica = 1; // replica requested for resize.
+  ResizeContext resize_ctx = 2; // context info for resize operation.
+}
+
 message ListReplicaOptions {
   google.protobuf.StringValue name = 1; // list the replica with the name if provided
   google.protobuf.StringValue poolname = 2; // list the replicas on the provided pool, by name
diff --git a/apis/io-engine/src/v1.rs b/apis/io-engine/src/v1.rs
index b051731..76f5691 100644
--- a/apis/io-engine/src/v1.rs
+++ b/apis/io-engine/src/v1.rs
@@ -18,7 +18,7 @@ mod pb {
 }
 
 pub mod common {
-    pub use super::pb::ShareProtocol;
+    pub use super::pb::{ResizeContext, ShareProtocol};
 }
 
 /// v1 version of bdev grpc API
@@ -55,7 +55,8 @@ pub mod replica {
         replica_rpc_client::ReplicaRpcClient,
         replica_rpc_server::{ReplicaRpc, ReplicaRpcServer},
         CreateReplicaRequest, DestroyReplicaRequest, ListReplicaOptions, ListReplicasResponse,
-        Replica, ReplicaSpaceUsage, ShareReplicaRequest, SnapshotInfo, UnshareReplicaRequest,
+        Replica, ReplicaSpaceUsage, ResizeReplicaRequest, ResizeReplicaResponse,
+        ShareReplicaRequest, SnapshotInfo, UnshareReplicaRequest,
     };
 }
 pub mod snapshot {