diff --git a/include/spdk/blob.h b/include/spdk/blob.h
index 4c97c2b61..5a895fef7 100644
--- a/include/spdk/blob.h
+++ b/include/spdk/blob.h
@@ -316,6 +316,15 @@ uint64_t spdk_bs_get_cluster_size(struct spdk_blob_store *bs);
  */
 uint64_t spdk_bs_get_page_size(struct spdk_blob_store *bs);
 
+/**
+ * Get the io unit size in bytes.
+ *
+ * \param bs blobstore to query.
+ *
+ * \return io unit size.
+ */
+uint64_t spdk_bs_get_io_unit_size(struct spdk_blob_store *bs);
+
 /**
  * Get the number of free clusters.
  *
@@ -352,6 +361,15 @@ spdk_blob_id spdk_blob_get_id(struct spdk_blob *blob);
  */
 uint64_t spdk_blob_get_num_pages(struct spdk_blob *blob);
 
+/**
+ * Get the number of io_units allocated to the blob.
+ *
+ * \param blob Blob struct to query.
+ *
+ * \return the number of io_units.
+ */
+uint64_t spdk_blob_get_num_io_units(struct spdk_blob *blob);
+
 /**
  * Get the number of clusters allocated to the blob.
  *
@@ -630,8 +648,8 @@ void spdk_bs_free_io_channel(struct spdk_io_channel *channel);
  * \param blob Blob to write.
  * \param channel The I/O channel used to submit requests.
  * \param payload The specified buffer which should contain the data to be written.
- * \param offset Offset is in pages from the beginning of the blob.
- * \param length Size of data in pages.
+ * \param offset Offset is in io units from the beginning of the blob.
+ * \param length Size of data in io units.
  * \param cb_fn Called when the operation is complete.
  * \param cb_arg Argument passed to function cb_fn.
  */
@@ -645,8 +663,8 @@ void spdk_blob_io_write(struct spdk_blob *blob, struct spdk_io_channel *channel,
  * \param blob Blob to read.
  * \param channel The I/O channel used to submit requests.
  * \param payload The specified buffer which will store the obtained data.
- * \param offset Offset is in pages from the beginning of the blob.
- * \param length Size of data in pages.
+ * \param offset Offset is in io units from the beginning of the blob.
+ * \param length Size of data in io units.
  * \param cb_fn Called when the operation is complete.
  * \param cb_arg Argument passed to function cb_fn.
  */
@@ -662,8 +680,8 @@ void spdk_blob_io_read(struct spdk_blob *blob, struct spdk_io_channel *channel,
  * \param channel I/O channel used to submit requests.
  * \param iov The pointer points to an array of iovec structures.
  * \param iovcnt The number of buffers.
- * \param offset Offset is in pages from the beginning of the blob.
- * \param length Size of data in pages.
+ * \param offset Offset is in io units from the beginning of the blob.
+ * \param length Size of data in io units.
  * \param cb_fn Called when the operation is complete.
  * \param cb_arg Argument passed to function cb_fn.
  */
@@ -679,8 +697,8 @@ void spdk_blob_io_writev(struct spdk_blob *blob, struct spdk_io_channel *channel
  * \param channel I/O channel used to submit requests.
  * \param iov The pointer points to an array of iovec structures.
  * \param iovcnt The number of buffers.
- * \param offset Offset is in pages from the beginning of the blob.
- * \param length Size of data in pages.
+ * \param offset Offset is in io units from the beginning of the blob.
+ * \param length Size of data in io units.
  * \param cb_fn Called when the operation is complete.
  * \param cb_arg Argument passed to function cb_fn.
  */
@@ -694,7 +712,7 @@ void spdk_blob_io_readv(struct spdk_blob *blob, struct spdk_io_channel *channel,
  *
  * \param blob Blob to unmap.
  * \param channel I/O channel used to submit requests.
- * \param offset Offset is in pages from the beginning of the blob.
+ * \param offset Offset is in io units from the beginning of the blob.
  * \param length Size of unmap area in pages.
  * \param cb_fn Called when the operation is complete.
  * \param cb_arg Argument passed to function cb_fn.
@@ -707,8 +725,8 @@ void spdk_blob_io_unmap(struct spdk_blob *blob, struct spdk_io_channel *channel,
  *
  * \param blob Blob to write.
  * \param channel I/O channel used to submit requests.
- * \param offset Offset is in pages from the beginning of the blob.
- * \param length Size of data in pages.
+ * \param offset Offset is in io units from the beginning of the blob.
+ * \param length Size of data in io units.
  * \param cb_fn Called when the operation is complete.
  * \param cb_arg Argument passed to function cb_fn.
  */
diff --git a/lib/blob/blobstore.c b/lib/blob/blobstore.c
index 01546277f..e8cb4a6eb 100644
--- a/lib/blob/blobstore.c
+++ b/lib/blob/blobstore.c
@@ -3972,6 +3972,12 @@ spdk_bs_get_page_size(struct spdk_blob_store *bs)
 	return SPDK_BS_PAGE_SIZE;
 }
 
+uint64_t
+spdk_bs_get_io_unit_size(struct spdk_blob_store *bs)
+{
+	return SPDK_BS_PAGE_SIZE;
+}
+
 uint64_t
 spdk_bs_free_cluster_count(struct spdk_blob_store *bs)
 {
@@ -4018,6 +4024,13 @@ uint64_t spdk_blob_get_num_pages(struct spdk_blob *blob)
 	return _spdk_bs_cluster_to_page(blob->bs, blob->active.num_clusters);
 }
 
+uint64_t spdk_blob_get_num_io_units(struct spdk_blob *blob)
+{
+	assert(blob != NULL);
+
+	return spdk_blob_get_num_pages(blob);
+}
+
 uint64_t spdk_blob_get_num_clusters(struct spdk_blob *blob)
 {
 	assert(blob != NULL);
diff --git a/test/unit/lib/bdev/vbdev_lvol.c/vbdev_lvol_ut.c b/test/unit/lib/bdev/vbdev_lvol.c/vbdev_lvol_ut.c
index 5fff6ddef..2500378ba 100644
--- a/test/unit/lib/bdev/vbdev_lvol.c/vbdev_lvol_ut.c
+++ b/test/unit/lib/bdev/vbdev_lvol.c/vbdev_lvol_ut.c
@@ -279,6 +279,12 @@ spdk_bs_get_page_size(struct spdk_blob_store *bs)
 	return SPDK_BS_PAGE_SIZE;
 }
 
+uint64_t
+spdk_bs_get_io_unit_size(struct spdk_blob_store *bs)
+{
+	return SPDK_BS_PAGE_SIZE;
+}
+
 static void
 bdev_blob_destroy(struct spdk_bs_dev *bs_dev)
 {