.BR no\-ppl ,
.BR layout\-original ,
.BR layout\-alternate ,
+.BR layout\-unspecified ,
.BR metadata ,
or
.BR super\-minor .
.B layout\-original
and
.B layout\-alternate
-options are for RAID0 arrays in use before Linux 5.4. If the array was being
-used with Linux 3.13 or earlier, then to assemble the array on a new kernel,
+options are for RAID0 arrays with non-uniform devices size that were in
+use before Linux 5.4. If the array was being used with Linux 3.13 or
+earlier, then to assemble the array on a new kernel,
.B \-\-update=layout\-original
must be given. If the array was created and used with a kernel from Linux 3.14 to
Linux 5.3, then
For more information, see
.IR md (4).
+The
+.B layout\-unspecified
+option reverts the effect of
+.B layout\-orignal
+or
+.B layout\-alternate
+and allows the array to be again used on a kernel prior to Linux 5.3.
+This option should be used with great caution.
+
.TP
.BR \-\-freeze\-reshape
Option is intended to be used in start-up scripts during initrd boot phase.