Lustre 1.6 Operations Manual

Options
The various lfs options are listed and described below. For a complete list of
available options, type help at the lfs prompt.
Option
Description
check
Displays the status of MDS or OSTs (as specified in the command) or
all of the servers (MDS and OSTs).
df
Reports filesystem disk space usage or inode usage of each
MDT/OST.
find
Searches the directory tree rooted at the given directory/filename for
files that match the given parameters.
Using ! before an option negates its meaning (files NOT matching the
parameter). Using + before a numeric value means files with the
parameter OR MORE. Using - before a numeric value means files
with the parameter OR LESS.
--atime
File was last accessed N*24 hours ago. (There is no guarantee that
atime is kept coherent across the cluster.)
OSTs store a transient atime that is updated when clients do read
requests. Permanent atime is written to the MDS when the file is
closed. However, on-disk atime is only updated if it is more than 60
seconds old (/proc/fs/lustre/mds/*/max_atime_diff). Lustre
considers the latest atime from all OSTs. If a setattr is set by user,
then it is updated on both the MDS and OST, allowing the atime to
go backward.
--mtime
File status was last modified N*24 hours ago.
--ctime
File data was last changed N*24 hours ago.
--maxdepth
Allows the find command to descend at most N levels of the
directory tree.
--print
Prints the full filename, followed by a new line.
28-4 Lustre 1.6 Operations Manual • September 2008