diff --git a/src/metadata/metadata_io.c b/src/metadata/metadata_io.c
index 697207b..06377b5 100644
--- a/src/metadata/metadata_io.c
+++ b/src/metadata/metadata_io.c
@@ -45,6 +45,19 @@ struct metadata_io_read_i_atomic_context {
 	void *priv;
 };
 
+enum ocf_mio_size {
+	ocf_mio_size_1 = 0,
+	ocf_mio_size_2,
+	ocf_mio_size_4,
+	ocf_mio_size_8,
+	ocf_mio_size_16,
+	ocf_mio_size_32,
+	ocf_mio_size_64,
+	ocf_mio_size_max,
+};
+
+#define METADATA_IO_REQS_LIMIT 128
+
 static void metadata_io_read_i_atomic_complete(
 		struct metadata_io_read_i_atomic_context *context, int error)
 {
@@ -301,7 +314,8 @@ void metadata_io_req_finalize(struct metadata_io_request *m_req)
 	struct metadata_io_request_asynch *a_req = m_req->asynch;
 
 	if (env_atomic_dec_return(&a_req->req_active) == 0)
-		env_free(a_req);
+		env_mpool_del(m_req->cache->owner->resources.mio, a_req,
+				a_req->alloc_req_count);
 }
 
 static uint32_t metadata_io_max_page(ocf_cache_t cache)
@@ -375,11 +389,13 @@ static int metadata_io_i_asynch(ocf_cache_t cache, ocf_queue_t queue, int dir,
 	uint32_t io_count = OCF_DIV_ROUND_UP(count, max_count);
 	uint32_t req_count = OCF_MIN(io_count, METADATA_IO_REQS_LIMIT);
 	int i;
+	struct env_mpool *mio_allocator = cache->owner->resources.mio;
 
 	if (count == 0)
 		return 0;
 
-	a_req = env_zalloc(sizeof(*a_req), ENV_MEM_NOIO);
+
+	a_req = env_mpool_new(mio_allocator, req_count);
 	if (!a_req)
 		return -OCF_ERR_NO_MEM;
 
@@ -389,6 +405,7 @@ static int metadata_io_i_asynch(ocf_cache_t cache, ocf_queue_t queue, int dir,
 	a_req->on_complete = compl_hndl;
 	a_req->context = context;
 	a_req->page = page;
+	a_req->alloc_req_count = req_count;
 	a_req->count = count;
 	a_req->flags = flags;
 	a_req->on_meta_fill = io_hndl;
@@ -427,14 +444,15 @@ static int metadata_io_i_asynch(ocf_cache_t cache, ocf_queue_t queue, int dir,
 		compl_hndl(cache, context, a_req->error);
 
 	if (env_atomic_dec_return(&a_req->req_active) == 0)
-		env_free(a_req);
+		env_mpool_del(mio_allocator, a_req, req_count);
 
 	return 0;
 
 err:
 	while (i--)
 		ctx_data_free(cache->owner, a_req->reqs[i].data);
-	env_free(a_req);
+
+	env_mpool_del(mio_allocator, a_req, req_count);
 
 	return -OCF_ERR_NO_MEM;
 }
@@ -457,6 +475,36 @@ int metadata_io_read_i_asynch(ocf_cache_t cache, ocf_queue_t queue,
 			page, count, flags, drain_hndl, compl_hndl);
 }
 
+#define MIO_RPOOL_LIMIT 16
+#define MIO_RPOOL_THRESHOLD ocf_mio_size_16 /* This is statically determined to
+					       not exceed one page (4096B).
+					       Change if apropriate. */
+
+int ocf_metadata_io_ctx_init(struct ocf_ctx *ocf_ctx)
+{
+	uint32_t limits[] = {
+		[0 ... MIO_RPOOL_THRESHOLD - 1] = -1,
+		[MIO_RPOOL_THRESHOLD ... ocf_mio_size_max - 1] = MIO_RPOOL_LIMIT
+	};
+
+	ocf_ctx->resources.mio = env_mpool_create(
+			sizeof(struct metadata_io_request_asynch),
+			sizeof(struct metadata_io_request),
+			ENV_MEM_NOIO, ocf_mio_size_max - 1, true,
+			limits,
+			"ocf_mio");
+	if (ocf_ctx->resources.mio == NULL)
+		return -1;
+
+	return 0;
+}
+
+void ocf_metadata_io_ctx_deinit(struct ocf_ctx *ocf_ctx)
+{
+	env_mpool_destroy(ocf_ctx->resources.mio);
+	ocf_ctx->resources.mio = NULL;
+}
+
 int ocf_metadata_io_init(ocf_cache_t cache)
 {
 	return ocf_metadata_updater_init(cache);
diff --git a/src/metadata/metadata_io.h b/src/metadata/metadata_io.h
index 7109ce2..c26adf8 100644
--- a/src/metadata/metadata_io.h
+++ b/src/metadata/metadata_io.h
@@ -54,16 +54,12 @@ struct metadata_io_request {
 	env_atomic finished;
 	uint32_t page;
 	uint32_t count;
-	int error;
 };
 
-#define METADATA_IO_REQS_LIMIT 33
-
 /*
  * Asynchronous IO request context
  */
 struct metadata_io_request_asynch {
-	struct metadata_io_request reqs[METADATA_IO_REQS_LIMIT];
 	void *context;
 	env_atomic req_remaining;
 	env_atomic req_active;
@@ -73,8 +69,10 @@ struct metadata_io_request_asynch {
 	ocf_metadata_io_end_t on_complete;
 	uint32_t page;
 	uint32_t count;
+	uint32_t alloc_req_count; /*< Number of allocated metadata_io_requests */
 	int flags;
 	int error;
+	struct metadata_io_request reqs[];
 };
 
 void metadata_io_req_complete(struct metadata_io_request *m_req);
@@ -144,6 +142,16 @@ int metadata_io_read_i_asynch(ocf_cache_t cache, ocf_queue_t queue,
 		ocf_metadata_io_event_t drain_hndl,
 		ocf_metadata_io_end_t compl_hndl);
 
+/**
+ * Initialize ocf_ctx related structures of metadata_io (mpool).
+ */
+int ocf_metadata_io_ctx_init(struct ocf_ctx *ocf_ctx);
+
+/**
+ * Deinitialize ocf_ctx related structures of metadata_io
+ */
+void ocf_metadata_io_ctx_deinit(struct ocf_ctx *ocf_ctx);
+
 /**
  * Function for initializing metadata io.
  */
diff --git a/src/ocf_ctx.c b/src/ocf_ctx.c
index d2397b5..3256889 100644
--- a/src/ocf_ctx.c
+++ b/src/ocf_ctx.c
@@ -11,6 +11,7 @@
 #include "ocf_logger_priv.h"
 #include "ocf_core_priv.h"
 #include "mngt/ocf_mngt_core_pool_priv.h"
+#include "metadata/metadata_io.h"
 
 /*
  *
@@ -177,6 +178,10 @@ int ocf_ctx_create(ocf_ctx_t *ctx, const struct ocf_ctx_config *cfg)
 	if (ret)
 		goto err_logger;
 
+	ret = ocf_metadata_io_ctx_init(ocf_ctx);
+	if (ret)
+		goto err_mio;
+
 	ret = ocf_core_volume_type_init(ocf_ctx);
 	if (ret)
 		goto err_utils;
@@ -188,6 +193,8 @@ int ocf_ctx_create(ocf_ctx_t *ctx, const struct ocf_ctx_config *cfg)
 	return 0;
 
 err_utils:
+	ocf_metadata_io_ctx_deinit(ocf_ctx);
+err_mio:
 	ocf_req_allocator_deinit(ocf_ctx);
 err_logger:
 	ocf_logger_close(&ocf_ctx->logger);
@@ -234,7 +241,8 @@ void ocf_ctx_put(ocf_ctx_t ctx)
 	ocf_mngt_core_pool_deinit(ctx);
 	ocf_ctx_unregister_volume_types(ctx);
 	env_rmutex_destroy(&ctx->lock);
-	
+
+	ocf_metadata_io_ctx_deinit(ctx);
 	ocf_req_allocator_deinit(ctx);
 	ocf_logger_close(&ctx->logger);
 	env_free(ctx);
diff --git a/src/ocf_ctx_priv.h b/src/ocf_ctx_priv.h
index 76df528..9cba8a5 100644
--- a/src/ocf_ctx_priv.h
+++ b/src/ocf_ctx_priv.h
@@ -31,6 +31,7 @@ struct ocf_ctx {
 
 	struct {
 		struct env_mpool *req;
+		struct env_mpool *mio;
 	} resources;
 };