NAME

       mfstopology.cfg - MooseFS network topology definitions

DESCRIPTION

       The file mfstopology.cfg assigns IP addresses to network locations. This file is optional.
       If your network is very small (i.e. has just  one  switch)  or  network  topology  is  not
       necessary then leave this file empty.

SYNTAX

       Syntax is:

       IP_ADDRESSES LOCATION_PATH

       Lines starting with # character are ignored as comments.

       IP_ADDRESS can be specified in several forms:

       *                   all addresses
       n.n.n.n             single IP address
       n.n.n.n/b           IP class specified by network address and bits number
       n.n.n.n/m.m.m.m     IP class specified by network address and mask
       f.f.f.f-t.t.t.t     IP range specified by from-to addresses (inclusive)

       LOCATION_PATH can be specified as a sequence of words separated by vertical bars.

NOTES

       If one IP belongs to more than one definition then the last definition is used.

       Distance  between IP numbers is defined as follows: 0 when IP numbers are the same, 1 when
       IP numbers are different, but paths specified by these numbers are the same.  In  case  of
       different paths distance is defined as one plus maximum number of elements from both paths
       after common starting part.

       Distances are used to sort chunkservers during read and write operations.  They  are  also
       used  by  goal  chunks  replications  if  you  enable  REPLICATIONS_RESPECT_TOPOLOGY  (see
       mfsmaster.cfg(5)).  New chunks are created randomly (without using topology  information).
       Rebalance   routines   may   take   distances  into  account  (see  CHUNKS_UNIQUE_MODE  in
       mfsmaster.cfg(5)).

EXAMPLES

       192.168.1.0/24                US|CHICAGO|WTOWER|R1A

       192.168.2.0-192.168.2.255     PL|WARSAW|GROCHOWSKA|R154

       192.168.3.0/255.255.255.0     123

       192.168.1.1                   A|B|C

DISTANCE EXAMPLES

       Distances calculated for two different IP numbers mapped to given location paths:

       d('US','DE') = 2

       d('US','') = 2

       d('US|PHOENIX|AT&T|RACK1','US|PHOENIX|AT&T|RACK2') = 2

       d('US|PHOENIX|AT&T|RACK1','US|PHOENIX|ATM|RACK7') = 3

       d('US|PHOENIX|AT&T|RACK1','US|CHICAGO|AT&T|RACK2') = 4

       d('US|PHOENIX|AT&T|RACK1','US|ATM') = 4

       d('US|PHOENIX|AT&T|RACK1','DE|BERLIN|ATM|RACK175') = 5

COPYRIGHT

       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 http://www.gnu.org/licenses/gpl-2.0.html

SEE ALSO

       mfsmaster(8), mfsmaster.cfg(5)