LU-930 utils: add --help option to lfs sub-commands

[fs/lustre-release.git] / lustre / doc / lfs-migrate.1

diff --git a/lustre/doc/lfs-migrate.1 b/lustre/doc/lfs-migrate.1
index 3e30ccc..0725c1d 100644 (file)
--- a/lustre/doc/lfs-migrate.1
+++ b/lustre/doc/lfs-migrate.1
@@ -3,8 +3,8 @@
 lfs migrate \- migrate files or directories between MDTs or OSTs.
 .SH SYNOPSIS
 .B lfs migrate
+.RB [ -h "] [" -v ]
 .RI [ SETSTRIPE_OPTIONS " ... ]"
-.RB [ -v ]
 .RI < file "> ..."
 .br
 .B lfs migrate -m \fIstart_mdt_index
@@ -47,6 +47,9 @@ being lost.  This should be used if an OST needs to be completely emptied
 prior to its removal, to ensure all requested files are migrated off the
 OST.
 .TP
+.BR -h , --help
+Print usage message.
+.TP
 .BR -n , --non-block
 Abort migration if concurrent file access is detected.  This can be
 used with OST space balancing migration to avoid interfering with file
@@ -99,16 +102,21 @@ Use
 for the new layout.
 .RS 1.2i
 .TP
-.B fnv_1a_64
-Fowler-Noll-Vo (FNV-1a) hash algorithm.  This provides
-reasonably uniform, but not cryptographically strong,
-hashing of the filename. (default)
-.TP
-.B all_char
+.B all_char (type 1)
 Sum of ASCII characters modulo number of MDTs. This
 provides weak hashing of the filename, and is suitable
 for only testing or when the input is known to have
 perfectly uniform distribution (e.g. sequential numbers).
+.TP
+.B fnv_1a_64 (type 2)
+Fowler-Noll-Vo (FNV-1a) hash algorithm.  This provides
+reasonably uniform, but not cryptographically strong,
+hashing of the filename. (default)
+.TP
+.B crush (type 3)
+CRUSH hash algorithm.  This is a consistent hash
+algorithm, so minimum sub files need to relocate
+during directory restripe.
 .RE
 .P
 Only the root user can migrate directories.  Files that have been archived by