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mfssclass(1) This is part of MooseFS mfssclass(1)


mfssclass - MooseFS storage classes management tools


mfsgetsclass [-r] [-n|-h|-H|-k|-m|-g] OBJECT...

mfssetsclass [-r] [-n|-h|-H|-k|-m|-g] SCLASS_NAME OBJECT...

mfscopysclass [-r] [-n|-h|-H|-k|-m|-g] SOURCE_OBJECT OBJECT...

mfsxchgsclass [-r] [-n|-h|-H|-k|-m|-g] SRC_SCLASS_NAME DST_SCLASS_NAME OBJECT...

mfslistsclass [-l] [MOUNT_POINT]


These tools operate on object's storage class name. This is an extended version of classic goal. There are predefined storage classes provided as equivalents of goals 1 to 9 (names are simply "1","2",...,"9"). Other classes can be created/modified/deleted etc. by administrator using mfsscadmin tool.

mfsgetsclass prints current storage class of given object(s). -r option enables recursive mode, for files there is no difference, for directories it shows the number of objects in each storage class containded in the whole subtree of this directory.

mfssetsclass changes current storage class of given object(s). -r option enables recursive mode.

mfscopysclass copies storage class from one object to given object(s).

mfsxchgsclass sets storage class to DST_SCLASS_NAME of given objects(s) but only when current storage class is set to SRC_SCLASS_NAME.

mfslistsclass lists currently defined storage classes. -l option enables long format - whole class definition is printed for each class, not only its name. For description of storage class definition refer to mfsscadmin manpage.


Most of mfstools use -n, -h, -H, -k, -m and -g options to select format of printed numbers. -n causes to print exact numbers, -h uses binary prefixes (Ki, Mi, Gi as 2^10, 2^20 etc.) while -H uses SI prefixes (k, M, G as 10^3, 10^6 etc.). -k, -m and -g show plain numbers respectivaly in kibis (binary kilo - 1024), mebis (binary mega - 1024^2) and gibis (binary giga - 1024^3). The same can be achieved by setting MFSHRFORMAT environment variable to: 0 (exact numbers), 1 or h (binary prefixes), 2 or H (SI prefixes), 3 or h+ (exact numbers and binary prefixes), 4 or H+ (exact numbers and SI prefixes). The default is to print just exact numbers.


When new object is created in MooseFS, attributes such as storage class, trashtime and extra attributes are inherited from parent directory. So if you set i.e. "noowner" attribute and storage class to "important" in a directory then every new object created in this directory will have storage class set to "important" and "noowner" flag set. A newly created object inherits always the current set of its parent's attributes. Changing a directory attribute does not affect its already created children. To change an attribute for a directory and all of its children use -r option.


Report bugs to <>.


Copyright (C) 2021 Jakub Kruszona-Zawadzki, Core Technology Sp. z o.o.

This file is part of MooseFS.

MooseFS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2 (only).

MooseFS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with MooseFS; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1301, USA or visit


mfsmount(8), mfstools(1), mfsscadmin(1)

August 2021 MooseFS 3.0.116-1