LU-11025 dne: introduce new directory hash type: "crush"

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

diff --git a/lustre/doc/lfs-setdirstripe.1 b/lustre/doc/lfs-setdirstripe.1
index 9f52fa8..8d48380 100644 (file)
--- a/lustre/doc/lfs-setdirstripe.1
+++ b/lustre/doc/lfs-setdirstripe.1
@@ -29,9 +29,9 @@ Use the MDT whose index is
 as the master/starting MDT for the directory. If multiple
 .I MDT_INDEX
 values are given, then the stripes will be allocated on the specified
-MDT indices.  If index -1 (default) is used, it will randomly pick
-.I COUNT
-less full MDTs.
+MDT indices.  If index -1 (default) is used, it will prefer to select
+.B COUNT
+MDTs proportional to the free space and inodes on each.
 .TP
 .BR \-H ", " \-\-mdt-hash =\fIHASH_TYPE\fR
 Use
@@ -39,6 +39,11 @@ Use
 for the striped directory.
 .RS 1.2i
 .TP
+.B crush
+CRUSH hash algorithm.  This is a consistent hash
+algorithm, so minimum sub files need to relocate
+during directory restripe.
+.TP
 .B fnv_1a_64
 Fowler-Noll-Vo (FNV-1a) hash algorithm.  This provides
 reasonably uniform, but not cryptographically strong,