**1**
Backward-compatible alias for **mixed**.
-
+
**2**
Alias for **both**.
I/O engine supporting asynchronous read and write operations to the
DAOS File System (DFS) via libdfs.
+ **nfs**
+ I/O engine supporting asynchronous read and write operations to
+ NFS filesystems from userspace via libnfs. This is useful for
+ achieving higher concurrency and thus throughput than is possible
+ via kernel NFS.
+
I/O engine specific parameters
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Specificy a different object class for the dfs file.
Use DAOS container's object class by default.
+.. option:: nfs_url=str : [nfs]
+
+ URL in libnfs format, eg nfs://<server|ipv4|ipv6>/path[?arg=val[&arg=val]*]
+ Refer to the libnfs README for more details.
+
I/O depth
~~~~~~~~~