[PATCH v2 2/4] pmemblk, dev-dax: Update descriptions

[Robert Elliott <elliott@hpe.com>]

From: Robert Elliott <elliott@hpe.com>

Make the descriptions of the pmemblk and dev-dax ioengines
more symmetric.
---
 HOWTO | 10 ++++++----
 fio.1 |  6 ++++--
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/HOWTO b/HOWTO
index 4354e46..9e1ffa6 100644
--- a/HOWTO
+++ b/HOWTO
@@ -903,11 +903,13 @@ ioengine=str	Defines how the job issues io to the file. The following
 				overwriting. The writetrim mode works well
 				for this constraint.
 
-			pmemblk	Read and write through the NVML libpmemblk
-				interface.
+			pmemblk	Read and write using filesystem DAX to a file
+				on a filesystem mounted with DAX on a persistent
+				memory device through the NVML libpmemblk library.
 
-			dev-dax Read and write through a DAX device exposed
-				from persistent memory.
+			dev-dax Read and write using device DAX to a persistent
+				memory device (e.g., /dev/dax0.0) through the
+				NVML libpmem library.
 
 			external Prefix to specify loading an external
 				IO engine object file. Append the engine
diff --git a/fio.1 b/fio.1
index f486276..56f2d11 100644
--- a/fio.1
+++ b/fio.1
@@ -811,10 +811,12 @@ and discarding before overwriting. The trimwrite mode works well for this
 constraint.
 .TP
 .B pmemblk
-Read and write through the NVML libpmemblk interface.
+Read and write using filesystem DAX to a file on a filesystem mounted with
+DAX on a persistent memory device through the NVML libpmemblk library.
 .TP
 .B dev-dax
-Read and write through a DAX device exposed from persistent memory.
+Read and write using device DAX to a persistent memory device
+(e.g., /dev/dax0.0) through the NVML libpmem library.
 .RE
 .P
 .RE
-- 
2.9.3