Merge branch 'ime-support' of https://github.com/DDNStorage/fio-public into ddn-ime

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 743144f03d14f76d46cf43d5191cf7217c4cd849..ff7aa096495a969aea9eddb0c8159f8054b6b0d1 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -1901,6 +1901,22 @@ I/O engine
                        mounted with DAX on a persistent memory device through the PMDK
                        libpmem library.
 
+               **ime_psync**
+                       Synchronous read and write using DDN's Infinite Memory Engine (IME).
+                       This engine is very basic and issues calls to IME whenever an IO is
+                       queued.
+
+               **ime_psyncv**
+                       Synchronous read and write using DDN's Infinite Memory Engine (IME).
+                       This engine uses iovecs and will try to stack as much IOs as possible
+                       (if the IOs are "contiguous" and the IO depth is not exceeded)
+                       before issuing a call to IME.
+
+               **ime_aio**
+                       Asynchronous read and write using DDN's Infinite Memory Engine (IME).
+                       This engine will try to stack as much IOs as possible by creating
+                       requests for IME. FIO will then decide when to commit these requests.
+
 I/O engine specific parameters
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~