diff --git a/node-binding/addon.cc b/node-binding/addon.cc
index 3cbc32c2..480edf91 100644
--- a/node-binding/addon.cc
+++ b/node-binding/addon.cc
@@ -16,6 +16,9 @@ NAN_MODULE_INIT(InitAddon)
     Nan::SetPrototypeMethod(tpl, "write", NodeVitastor::Write);
     Nan::SetPrototypeMethod(tpl, "sync", NodeVitastor::Sync);
     Nan::SetPrototypeMethod(tpl, "read_bitmap", NodeVitastor::ReadBitmap);
+    Nan::SetPrototypeMethod(tpl, "on_ready", NodeVitastor::OnReady);
+    Nan::SetPrototypeMethod(tpl, "get_min_io_size", NodeVitastor::GetMinIoSize);
+    Nan::SetPrototypeMethod(tpl, "get_max_atomic_write_size", NodeVitastor::GetMaxAtomicWriteSize);
     //Nan::SetPrototypeMethod(tpl, "destroy", NodeVitastor::Destroy);
 
     Nan::Set(target, Nan::New("Client").ToLocalChecked(), Nan::GetFunction(tpl).ToLocalChecked());
diff --git a/node-binding/client.cc b/node-binding/client.cc
index f86ee06b..43db7b25 100644
--- a/node-binding/client.cc
+++ b/node-binding/client.cc
@@ -267,6 +267,53 @@ static void on_error(NodeVitastorRequest *req, Nan::Callback & nanCallback, long
     nanCallback.Call(1, args, req);
 }
 
+// on_ready(callback(err))
+NAN_METHOD(NodeVitastor::OnReady)
+{
+    TRACE("NodeVitastor::OnReady");
+    if (info.Length() < 1)
+        Nan::ThrowError("Not enough arguments to on_ready(callback(err))");
+    NodeVitastor* self = Nan::ObjectWrap::Unwrap<NodeVitastor>(info.This());
+    v8::Local<v8::Function> callback = info[0].As<v8::Function>();
+    auto req = new NodeVitastorRequest(self, callback);
+    self->Ref();
+    vitastor_c_on_ready(self->c, on_ready_finish, req);
+}
+
+void NodeVitastor::on_ready_finish(void *opaque, long retval)
+{
+    TRACE("NodeVitastor::on_ready_finish");
+    auto req = (NodeVitastorRequest*)opaque;
+    auto self = req->cli;
+    Nan::HandleScope scope;
+    Nan::Callback nanCallback(Nan::New(req->callback));
+    nanCallback.Call(0, NULL, req);
+    self->Unref();
+    delete req;
+}
+
+// get_min_io_size(pool_id)
+NAN_METHOD(NodeVitastor::GetMinIoSize)
+{
+    TRACE("NodeVitastor::GetMinIoSize");
+    if (info.Length() < 1)
+        Nan::ThrowError("Not enough arguments to get_min_io_size(pool_id)");
+    NodeVitastor* self = Nan::ObjectWrap::Unwrap<NodeVitastor>(info.This());
+    uint64_t pool = get_ui64(info[0]);
+    info.GetReturnValue().Set(Nan::New<v8::Number>(vitastor_c_inode_get_bitmap_granularity(self->c, INODE_WITH_POOL(pool, 1))));
+}
+
+// get_max_atomic_write_size(pool_id)
+NAN_METHOD(NodeVitastor::GetMaxAtomicWriteSize)
+{
+    TRACE("NodeVitastor::GetMaxAtomicWriteSize");
+    if (info.Length() < 1)
+        Nan::ThrowError("Not enough arguments to get_max_atomic_write_size(pool_id)");
+    NodeVitastor* self = Nan::ObjectWrap::Unwrap<NodeVitastor>(info.This());
+    uint64_t pool = get_ui64(info[0]);
+    info.GetReturnValue().Set(Nan::New<v8::Number>(vitastor_c_inode_get_block_size(self->c, INODE_WITH_POOL(pool, 1))));
+}
+
 void NodeVitastor::on_read_finish(void *opaque, long retval, uint64_t version)
 {
     TRACE("NodeVitastor::on_read_finish");
diff --git a/node-binding/client.h b/node-binding/client.h
index 2c807be4..cd10dbd0 100644
--- a/node-binding/client.h
+++ b/node-binding/client.h
@@ -15,14 +15,20 @@ class NodeVitastor: public Nan::ObjectWrap
 public:
     // constructor({ ...config })
     static NAN_METHOD(Create);
-    // read(pool, inode, offset, len, callback(err, buffer, version))
+    // read(pool_id, inode, offset, len, callback(err, buffer, version))
     static NAN_METHOD(Read);
-    // write(pool, inode, offset, buf: Buffer | Buffer[], { version }?, callback(err))
+    // write(pool_id, inode, offset, buf: Buffer | Buffer[], { version }?, callback(err))
     static NAN_METHOD(Write);
     // sync(callback(err))
     static NAN_METHOD(Sync);
-    // read_bitmap(pool, inode, offset, len, with_parents, callback(err, bitmap_buffer))
+    // read_bitmap(pool_id, inode, offset, len, with_parents, callback(err, bitmap_buffer))
     static NAN_METHOD(ReadBitmap);
+    // on_ready(callback(err))
+    static NAN_METHOD(OnReady);
+    // get_min_io_size(pool_id)
+    static NAN_METHOD(GetMinIoSize);
+    // get_max_atomic_write_size(pool_id)
+    static NAN_METHOD(GetMaxAtomicWriteSize);
 //    // destroy()
 //    static NAN_METHOD(Destroy);
 
@@ -37,6 +43,7 @@ private:
 
     static void on_io_readable(uv_poll_t* handle, int status, int revents);
     static void on_read_finish(void *opaque, long retval, uint64_t version);
+    static void on_ready_finish(void *opaque, long retval);
     static void on_write_finish(void *opaque, long retval);
     static void on_read_bitmap_finish(void *opaque, long retval, uint8_t *bitmap);
 
diff --git a/src/client/vitastor_c.cpp b/src/client/vitastor_c.cpp
index c91e9476..f6fe95b9 100644
--- a/src/client/vitastor_c.cpp
+++ b/src/client/vitastor_c.cpp
@@ -222,6 +222,14 @@ int vitastor_c_is_ready(vitastor_c *client)
     return client->cli->is_ready();
 }
 
+void vitastor_c_on_ready(vitastor_c *client, VitastorIOHandler cb, void *opaque)
+{
+    client->cli->on_ready([=]()
+    {
+        cb(opaque, 0);
+    });
+}
+
 void vitastor_c_uring_wait_ready(vitastor_c *client)
 {
     while (!client->cli->is_ready())
diff --git a/src/client/vitastor_c.h b/src/client/vitastor_c.h
index 613a7bd8..f5b1788d 100644
--- a/src/client/vitastor_c.h
+++ b/src/client/vitastor_c.h
@@ -51,6 +51,7 @@ vitastor_c *vitastor_c_create_epoll_json(const char **options, int options_len);
 void* vitastor_c_get_internal_client(vitastor_c *client);
 void vitastor_c_destroy(vitastor_c *client);
 int vitastor_c_is_ready(vitastor_c *client);
+void vitastor_c_on_ready(vitastor_c *client, VitastorIOHandler cb, void *opaque);
 int vitastor_c_uring_register_eventfd(vitastor_c *client);
 void vitastor_c_uring_wait_ready(vitastor_c *client);
 void vitastor_c_uring_handle_events(vitastor_c *client);