LU-1962 doc: add "lfs df --lazy" description

The "lfs df --lazy" option was previously added in change
http://review.whamcloud.com/4007 but was not documented.
Add a short description to the lfs.1 man page.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I9f29d11ddaadd7b415c655ac43ba2738433ebbe5
Reviewed-on: http://review.whamcloud.com/7689
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andriy Skulysh <Andriy_Skulysh@xyratex.com>
Reviewed-by: Alexander Boyko <alexander_boyko@xyratex.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>

diff --git a/lustre/doc/lfs.1 b/lustre/doc/lfs.1
index 8a976e6..6f42109 100644 (file)
--- a/lustre/doc/lfs.1
+++ b/lustre/doc/lfs.1
@@ -11,7 +11,7 @@ lfs \- Lustre utility to create a file with specific striping pattern, find the
 .br
 .B lfs check <mds|osts|servers>
 .br
 .br
 .B lfs check <mds|osts|servers>
 .br

-.B lfs df [-i] [-h] [--pool|-p <fsname>[.<pool>] [path]
+.B lfs df [-i] [-h] [--lazy] [--pool|-p <fsname>[.<pool>] [path]

 .br
 .B lfs fid2path [--link <linkno>] <fsname|rootpath> <fid> ...
 .br
 .br
 .B lfs fid2path [--link <linkno>] <fsname|rootpath> <fid> ...
 .br


@@ -103,13 +103,16 @@ Changelog consumers must be registered on the MDT node using \fBlctl\fR.
 .B check 
 Display the status of MDS or OSTs (as specified in the command) or all the servers (MDS and OSTs)
 .TP
 .B check 
 Display the status of MDS or OSTs (as specified in the command) or all the servers (MDS and OSTs)
 .TP

-.B df [-i] [-h] [--pool|-p <fsname>[.<pool>] [path]
+.B df [-i] [-h] [--lazy] [--pool|-p <fsname>[.<pool>] [path]

 Report filesystem disk space usage or inodes usage (with \fB-i\fR) of each
 MDT/OST, or a subset of OSTs if a pool is specified with \fB-p\fR.  By default
 print the usage of all mounted Lustre filesystems, otherwise if \fBpath\fR is
 specified print only the usage of that filesystem.  If \fB-h\fR is given, the
 output is printed in \fIh\fRuman readable format, using SI base-2 suffixes
 for \fBM\fRega-, \fBG\fRiga-, \fBT\fRera-, \fBP\fReta-, or \fBE\fRxabytes.
 Report filesystem disk space usage or inodes usage (with \fB-i\fR) of each
 MDT/OST, or a subset of OSTs if a pool is specified with \fB-p\fR.  By default
 print the usage of all mounted Lustre filesystems, otherwise if \fBpath\fR is
 specified print only the usage of that filesystem.  If \fB-h\fR is given, the
 output is printed in \fIh\fRuman readable format, using SI base-2 suffixes
 for \fBM\fRega-, \fBG\fRiga-, \fBT\fRera-, \fBP\fReta-, or \fBE\fRxabytes.

+The \fB--lazy\fR/\fB-l\fR option skips any OST that is currently disconnected
+from the client.  This avoids blocking the \fBdf\fR output if an OST is down,
+and only returns the space on the OSTs that can currently be accessed.

 .TP
 .B find 
 To search the directory tree rooted at the given dir/file name for the files that match the given parameters: \fB--atime\fR (file was last accessed N*24 hours ago), \fB--ctime\fR (file's status was last changed N*24 hours ago), \fB--mtime\fR (file's data was last modified N*24 hours ago), \fB--obd\fR (file has an object on a specific OST or OSTs), \fB--size\fR (file has size in bytes, or \fBk\fRilo-, \fBM\fRega-, \fBG\fRiga-, \fBT\fRera-, \fBP\fReta-, or \fBE\fRxabytes if a suffix is given), \fB--type\fR (file has the type: \fBb\fRlock, \fBc\fRharacter, \fBd\fRirectory, \fBp\fRipe, \fBf\fRile, sym\fBl\fRink, \fBs\fRocket, or \fBD\fRoor (Solaris)), \fB--uid\fR (file has specific numeric user ID), \fB--user\fR (file owned by specific user, numeric user ID allowed), \fB--gid\fR (file has specific group ID), \fB--group\fR (file belongs to specific group, numeric group ID allowed), \fB--layout\fR (file has a raid0 layout or is released). The option \fB--maxdepth\fR limits find to decend at most N levels of directory tree. The options \fB--print\fR and \fB--print0\fR print full file name, followed by a newline or NUL character correspondingly.  Using \fB!\fR before an option negates its meaning (\fIfiles NOT matching the parameter\fR).  Using \fB+\fR before a numeric value means \fIfiles with the parameter OR MORE\fR, while \fB-\fR before a numeric value means \fIfiles with the parameter OR LESS\fR.
 .TP
 .B find 
 To search the directory tree rooted at the given dir/file name for the files that match the given parameters: \fB--atime\fR (file was last accessed N*24 hours ago), \fB--ctime\fR (file's status was last changed N*24 hours ago), \fB--mtime\fR (file's data was last modified N*24 hours ago), \fB--obd\fR (file has an object on a specific OST or OSTs), \fB--size\fR (file has size in bytes, or \fBk\fRilo-, \fBM\fRega-, \fBG\fRiga-, \fBT\fRera-, \fBP\fReta-, or \fBE\fRxabytes if a suffix is given), \fB--type\fR (file has the type: \fBb\fRlock, \fBc\fRharacter, \fBd\fRirectory, \fBp\fRipe, \fBf\fRile, sym\fBl\fRink, \fBs\fRocket, or \fBD\fRoor (Solaris)), \fB--uid\fR (file has specific numeric user ID), \fB--user\fR (file owned by specific user, numeric user ID allowed), \fB--gid\fR (file has specific group ID), \fB--group\fR (file belongs to specific group, numeric group ID allowed), \fB--layout\fR (file has a raid0 layout or is released). The option \fB--maxdepth\fR limits find to decend at most N levels of directory tree. The options \fB--print\fR and \fB--print0\fR print full file name, followed by a newline or NUL character correspondingly.  Using \fB!\fR before an option negates its meaning (\fIfiles NOT matching the parameter\fR).  Using \fB+\fR before a numeric value means \fIfiles with the parameter OR MORE\fR, while \fB-\fR before a numeric value means \fIfiles with the parameter OR LESS\fR.