UPDATE & backdating

[Danny Braniss]

I don't know if this is the usual case, but I was caught by surprice :-)

--- /r+d/7.0/src/UPDATING       2008-02-28 17:28:19.000000000 +0200
+++ /r+d/releng_7/src/UPDATING  2008-07-14 09:07:13.000000000 +0300
@@ -285,6 +285,20 @@
           This does not affect those who are using "/dev/dsp".
 
 20061122:
+       geom(4)'s gmirror(8) class metadata structure has been
+       rev'd from v3 to v4. If you update across this point and
+       your metadata is converted for you, you will not be easily
+       able to downgrade since the /boot/kernel.old/geom_mirror.ko
+       kernel module will be unable to read the v4 metadata.  You
+       can resolve this by doing from the loader(8) prompt:
+
+               set vfs.root.mountfrom="ufs:/dev/XXX"
+
+       where XXX is the root slice of one of the disks that composed
+       the mirror (i.e.: /dev/ad0s1a). You can then rebuild
+       the array the same way you built it originally.
+
+20061122:
        The following binaries have been disconnected from the build:
        mount_devfs, mount_ext2fs, mount_fdescfs, mount_procfs, 
mount_linprocfs,
        and mount_std.  The functionality of these programs has been
@@ -925,4 +939,4 @@
 Contact Warner Losh if you have any questions about your use of
 this document.
 
-$FreeBSD: src/UPDATING,v 1.507.2.5 2008/02/24 05:16:55 kensmith Exp $
+$FreeBSD: src/UPDATING,v 1.507.2.7 2008/07/13 18:11:50 remko Exp $