Add support for O_ATOMIC

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index eb2ed25403cb8dfe2ae96e8a93d5e99aa98c8b39..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.