Add support for O_ATOMIC

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index ac6e258f06ed86f40e18f77cd9931534add7a610..250bc582f548640a92087a6d2119962d5f63d81e 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -695,6 +695,11 @@ direct=bool        If value is true, use non-buffered io. This is usually
                O_DIRECT. Note that ZFS on Solaris doesn't support direct io.
                On Windows the synchronous ioengines don't support direct io.
 
+atomic=bool    If value is true, attempt to use atomic direct IO. Atomic
+               writes are guaranteed to be stable once acknowledged by
+               the operating system. Only Linux supports O_ATOMIC right
+               now.
+
 buffered=bool  If value is true, use buffered io. This is the opposite
                of the 'direct' option. Defaults to true.
 
@@ -1151,9 +1156,6 @@ verify_backlog=int        Fio will normally verify the written contents of a
                holding this meta data. If this option is enabled, fio
                will write only N blocks before verifying these blocks.
 
-               will verify the previously written blocks before continuing
-               to write new ones.
-
 verify_backlog_batch=int       Control how many blocks fio will verify
                if verify_backlog is set. If not set, will default to
                the value of verify_backlog (meaning the entire queue
@@ -1252,9 +1254,6 @@ write_lat_log=str Same as write_bw_log, except that this option stores io
                and foo_lat.log. This helps fio_generate_plot fine the logs
                automatically.
 
-write_bw_log=str If given, write an IOPS log of the jobs in this job
-               file. See write_bw_log.
-
 write_iops_log=str Same as write_bw_log, but writes IOPS. If no filename is
                given with this option, the default filename of
                "jobname_type.log" is used. Even if the filename is given,