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D35326.id106390.diff
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Index: lib/geom/label/glabel.8
===================================================================
--- lib/geom/label/glabel.8
+++ lib/geom/label/glabel.8
@@ -24,7 +24,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd March 12, 2017
+.Dd May 26, 2022
.Dt GLABEL 8
.Os
.Sh NAME
@@ -143,6 +143,20 @@
are created in the
.Pa /dev/label/
directory.
+Note that such labels will be ignored by other operating systems, so
+generic labels should be used only when the device will be accessed solely
+by
+.Fx .
+Note also that generic, automatic labels occupy some space on the device
+and thus should not be added to a device already containing a file system.
+Instead, create a label before initializing the file system, and initialize
+that file system on the device created by
+.Nm
+under the
+.Pa /dev/label/
+directory.
+Then the file system will correctly account for the space occupied by the
+generic label.
.Pp
Note that for all label types, nested GEOM classes will cause additional
device nodes to be created, with context-specific data appended to their
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D35326: glabel.8: Warn against using generic labels on a shared device
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