svn commit: r322861 - stable/10

[Kirk McKusick]

Author: mckusick
Date: Thu Aug 24 21:49:44 2017
New Revision: 322861
URL: https://svnweb.freebsd.org/changeset/base/322861

Log:
  Note change brought on by 322860 MFC.
  
  Discussed with: kib, imp
  Differential Revision: https://reviews.freebsd.org/D11589
  Approved by: re (kib)

Modified:
  stable/10/UPDATING

Modified: stable/10/UPDATING
==============================================================================
--- stable/10/UPDATING	Thu Aug 24 21:44:23 2017	(r322860)
+++ stable/10/UPDATING	Thu Aug 24 21:49:44 2017	(r322861)
@@ -16,6 +16,19 @@ from older versions of FreeBSD, try WITHOUT_CLANG to b
 stable/10, and then rebuild without this option. The bootstrap process from
 older version of current is a bit fragile.
 
+20170824:
+	Since the switch to GPT disk labels, fsck for UFS/FFS has been
+	unable to automatically find alternate superblocks. As of r322860,
+	the information needed to find alternate superblocks has been
+	moved to the end of the area reserved for the boot block.
+	Filesystems created with a newfs of this vintage or later
+	will create the recovery information. If you have a filesystem
+	created prior to this change and wish to have a recovery block
+	created for your filesystem, you can do so by running fsck in
+	forground mode (i.e., do not use the -p or -y options). As it
+	starts, fsck will ask ``SAVE DATA TO FIND ALTERNATE SUPERBLOCKS''
+	to which you should answer yes.
+
 20170511:
 	The mmcsd.ko module now additionally depends on geom_flashmap.ko.
 	Also, mmc.ko and mmcsd.ko need to be a matching pair built from the