Merge branch 'dfs_engine' of https://github.com/johannlombardi/fio

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 52812cc7de37e7d5d95c34c45e757c8126643709..041b91fa828a239612ca840c560932cfbc58625c 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -2067,6 +2067,9 @@ I/O engine
                        unless :option:`verify` is set or :option:`cuda_io` is `posix`.
                        :option:`iomem` must not be `cudamalloc`. This ioengine defines
                        engine specific options.
+               **dfs**
+                       I/O engine supporting asynchronous read and write operations to the
+                       DAOS File System (DFS) via libdfs.
 
 I/O engine specific parameters
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -2452,6 +2455,24 @@ with the caveat that when used on the command line, they must come after the
                GPU to RAM before a write and copied from RAM to GPU after a
                read. :option:`verify` does not affect use of cudaMemcpy.
 
+.. option:: pool=str : [dfs]
+
+       Specify the UUID of the DAOS pool to connect to.
+
+.. option:: cont=str : [dfs]
+
+       Specify the UUID of the DAOS container to open.
+
+.. option:: chunk_size=int : [dfs]
+
+       Specificy a different chunk size (in bytes) for the dfs file.
+       Use DAOS container's chunk size by default.
+
+.. option:: object_class=str : [dfs]
+
+       Specificy a different object class for the dfs file.
+       Use DAOS container's object class by default.
+
 I/O depth
 ~~~~~~~~~
 
@@ -2663,11 +2684,12 @@ I/O latency
        true, fio will continue running and try to meet :option:`latency_target`
        by adjusting queue depth.
 
-.. option:: max_latency=time
+.. option:: max_latency=time[,time][,time]
 
        If set, fio will exit the job with an ETIMEDOUT error if it exceeds this
        maximum latency. When the unit is omitted, the value is interpreted in
-       microseconds.
+       microseconds. Comma-separated values may be specified for reads, writes,
+       and trims as described in :option:`blocksize`.
 
 .. option:: rate_cycle=int