b=19689

[fs/lustre-release.git] / lustre / doc / mkfs.lustre.8

diff --git a/lustre/doc/mkfs.lustre.8 b/lustre/doc/mkfs.lustre.8
index a891bf3..32a4098 100644 (file)
--- a/lustre/doc/mkfs.lustre.8
+++ b/lustre/doc/mkfs.lustre.8
@@ -59,7 +59,14 @@ Force a particular OST or MDT index
 Format options for the backing fs. For example, ext3 options could be set here.
 .TP
 .BI \--mountfsoptions= opts
-Set permanent mount options, equivalent to setting in /etc/fstab
+Set the mount options that will be used when mounting the backing fs.
+WARNING: unlike earlier versions of \fBmkfs.lustre\fR, this version completely
+replaces the default mount options with those specified on the command line,
+issuing a warning on stderr if any of the default mount options are omitted.
+The defaults for \fIldiskfs\fR are
+OST: \fIerrors=remount-ro,mballoc,extents\fR;
+MGS/MDT: \fIerrors=remount-ro,iopen_nopriv,user_xattr\fR.
+\fBDO NOT\fR alter the default mount options unless you know what you are doing.
 .TP
 .BI \--mgsnode= nid,...  
 Set the NID(s) of the MGS node, required for all targets other than the MGS.