diff --git a/CHANGELOG.md b/CHANGELOG.md
index c4b4714625..9f85733e37 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 ## v19.10: (Upcoming Release)
 
+### bdev
+
+Added `spdk_bdev_get_write_unit_size()` function for retrieving required number
+of logical blocks for write operation.
+
 ### nvmf
 
 The `spdk_nvmf_tgt_create` function now accepts an object of type `spdk_nvmf_target_opts`
diff --git a/include/spdk/bdev.h b/include/spdk/bdev.h
index cd55e63d58..4bf4810b4d 100644
--- a/include/spdk/bdev.h
+++ b/include/spdk/bdev.h
@@ -368,6 +368,21 @@ const char *spdk_bdev_get_product_name(const struct spdk_bdev *bdev);
  */
 uint32_t spdk_bdev_get_block_size(const struct spdk_bdev *bdev);
 
+/**
+ * Get the write unit size for this bdev.
+ *
+ * Write unit size is required number of logical blocks to perform write
+ * operation on block device.
+ *
+ * Unit of write unit size is logical block and the minimum of write unit
+ * size is one. Write operations must be multiple of write unit size.
+ *
+ * \param bdev Block device to query.
+ *
+ * \return The write unit size in logical blocks.
+ */
+uint32_t spdk_bdev_get_write_unit_size(const struct spdk_bdev *bdev);
+
 /**
  * Get size of block device in logical blocks.
  *
diff --git a/include/spdk/bdev_module.h b/include/spdk/bdev_module.h
index 1af89306d0..97f279cbfa 100644
--- a/include/spdk/bdev_module.h
+++ b/include/spdk/bdev_module.h
@@ -265,6 +265,9 @@ struct spdk_bdev {
 	/** Number of blocks */
 	uint64_t blockcnt;
 
+	/** Number of blocks required for write */
+	uint32_t write_unit_size;
+
 	/**
 	 * Specifies an alignment requirement for data buffers associated with an spdk_bdev_io.
 	 * 0 = no alignment requirement
diff --git a/lib/bdev/bdev.c b/lib/bdev/bdev.c
index 9704372493..0740d25749 100644
--- a/lib/bdev/bdev.c
+++ b/lib/bdev/bdev.c
@@ -2437,6 +2437,12 @@ spdk_bdev_get_block_size(const struct spdk_bdev *bdev)
 	return bdev->blocklen;
 }
 
+uint32_t
+spdk_bdev_get_write_unit_size(const struct spdk_bdev *bdev)
+{
+	return bdev->write_unit_size;
+}
+
 uint64_t
 spdk_bdev_get_num_blocks(const struct spdk_bdev *bdev)
 {
@@ -4073,6 +4079,11 @@ spdk_bdev_init(struct spdk_bdev *bdev)
 		}
 	}
 
+	/* If the user didn't specify a write unit size, set it to one. */
+	if (bdev->write_unit_size == 0) {
+		bdev->write_unit_size = 1;
+	}
+
 	TAILQ_INIT(&bdev->internal.open_descs);
 
 	TAILQ_INIT(&bdev->aliases);