From: nathan <nathan>
Date: Thu, 23 Apr 2009 20:54:00 +0000 (+0000)
Subject: b=19047
X-Git-Tag: v1_9_170~25
X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=commitdiff_plain;h=7c56e3c31e230be251a9aaffce4fc0d2d31aa679

b=19047
i=adilger
i=nathan
add llog_reader man page
---

diff --git a/lustre/doc/Makefile.am b/lustre/doc/Makefile.am
index 7481540..0a79a29 100644
--- a/lustre/doc/Makefile.am
+++ b/lustre/doc/Makefile.am
@@ -47,8 +47,9 @@ TEXEXPAND = texexpand
 SUFFIXES = .lin .lyx .pdf .ps .sgml .html .txt .tex .fig .eps .dvi
 
 MANFILES = lustre.7 lfs.1 mount.lustre.8 mkfs.lustre.8 tunefs.lustre.8 lctl.8 \
-	llverdev.8 llbackup.8 llapi_quotactl.3 llobdstat.8 llstat.8 plot-llstat.8 \
-	l_getgroups.8 lst.8 routerstat.8 ll_recover_lost_found_objs.8
+	llverdev.8 llbackup.8 llapi_quotactl.3 llobdstat.8 llstat.8 \
+	plot-llstat.8 l_getgroups.8 lst.8 routerstat.8 \
+	ll_recover_lost_found_objs.8 llog_reader.8
 
 if UTILS
 man_MANS = $(MANFILES)
diff --git a/lustre/doc/llog_reader.8 b/lustre/doc/llog_reader.8
new file mode 100644
index 0000000..b77542c
--- /dev/null
+++ b/lustre/doc/llog_reader.8
@@ -0,0 +1,40 @@
+.TH llog_reader 8 "2009 Apr 02" Lustre "System management commands"
+.SH NAME
+llog_reader \- lustre on-disk log parsing utility
+.SH SYNOPSIS
+.B "llog_reader filename"
+.br
+.SH DESCRIPTION
+.B llog_reader
+parses the binary format of Lustre's on-disk configuration logs.
+It can only read the logs.  Use
+.B tunefs.lustre
+to write to them.
+.LP
+To examine a log file on a stopped Lustre server, first mount its
+backing file system as ldiskfs, then use
+.B llog_reader
+to dump the log file's contents, e.g.
+.IP
+.nf
+mount -t ldiskfs /dev/sda /mnt/mgs
+llog_reader /mnt/mgs/CONFIGS/tfs-client
+.fi
+.LP
+To examine the same log file on a running Lustre server, use the
+ldiskfs-enabled debugfs utility (called
+.B debug.ldiskfs
+on some distros) to extract the file, e.g.
+.IP
+.nf
+debugfs -c -R 'dump CONFIGS/tfs-client /tmp/tfs-client' /dev/sda
+llog_reader /tmp/tfs-client
+.fi
+.SH CAVEATS
+Although they are stored in the CONFIGS directory, \fImountdata\fR
+files do not use the config log format and will confuse \fBllog_reader\fR.
+.SH SEE ALSO
+Lustre Operations Manual, Section 21.1, \fITroubleshooting Lustre\fR.
+.br
+.BR lustre (7),
+.BR tunefs.lustre (8)