>Number: 86362
>Category: docs
>Synopsis: fsck_ffs(8): An alternate super block location for UFS2 is not mentioned.
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-doc
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: doc-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Sep 20 06:40:00 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: KOMATSU Shinichiro
>Release: FreeBSD 5.4-RELEASE-p5 i386
>Organization:
>Environment:
FreeBSD 5.4-RELEASE-p5 i386
>Description:
According to fsck_ffs(8), alternate super block is located at block 32,
but this value is for UFS1 and 160 is the right value for UFS2.
>How-To-Repeat:
newfs(8) says super-block backup is locate at block 160 as follows:
# newfs /dev/md0
/dev/md0: 100.0MB (204800 sectors) block size 16384, fragment size 2048
using 4 cylinder groups of 25.02MB, 1601 blks, 3264 inodes.
super-block backups (for fsck -b #) at:
160, 51392, 102624, 153856
>Fix:
Index: fsck_ffs.8
===================================================================
RCS file: /home/ncvs/src/sbin/fsck_ffs/fsck_ffs.8,v
retrieving revision 1.31
diff -u -r1.31 fsck_ffs.8
--- fsck_ffs.8 2 Jul 2004 21:45:01 -0000 1.31
+++ fsck_ffs.8 20 Sep 2005 06:08:59 -0000
@@ -173,8 +173,8 @@
.It Fl b
Use the block specified immediately after the flag as
the super block for the file system.
-Block 32 is usually
-an alternate super block.
+An alternate super block is usually located at block 32 for UFS1,
+and block 160 for UFS2.
.It Fl c
Convert the file system to the specified level.
Note that the level of a file system can only be raised.
>Release-Note:
>Audit-Trail:
>Unformatted:
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