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-rw-r--r--sbin/mdconfig/mdconfig.83
1 files changed, 3 insertions, 0 deletions
diff --git a/sbin/mdconfig/mdconfig.8 b/sbin/mdconfig/mdconfig.8
index 0b97ddf1c120..4b2f8e246861 100644
--- a/sbin/mdconfig/mdconfig.8
+++ b/sbin/mdconfig/mdconfig.8
@@ -141,6 +141,9 @@ other devices.
.It Fl o Oo Cm no Oc Ns Ar option
Set or reset options.
.Bl -tag -width indent
+.It Oo Cm no Oc Ns Cm async
+For vnode backed devices: avoid IO_SYNC for increased performance but
+at the risk of deadlocking the entire kernel.
.It Oo Cm no Oc Ns Cm reserve
Allocate and reserve all needed storage from the start, rather than as needed.
.It Oo Cm no Oc Ns Cm cluster