HOWTO: Add note/exception on allow_mounted_write=

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index c2c65096bbd22461590c502aba6771b26598f672..e376ea5078ae3fdc0bf1d3fa4690987c728b2e60 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -886,7 +886,8 @@ Target file/device
        If this isn't set, fio will abort jobs that are destructive (e.g. that write)
        to what appears to be a mounted device or partition. This should help catch
        creating inadvertently destructive tests, not realizing that the test will
-       destroy data on the mounted file system. Default: false.
+       destroy data on the mounted file system. Note that some platforms don't allow
+       writing against a mounted device regardless of this option. Default: false.
 
 .. option:: pre_read=bool