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mfstopology.cfg(5) This is part of MooseFS mfstopology.cfg(5)

mfstopology.cfg - MooseFS network topology definitions

The file mfstopology.cfg contains assignments of IP addresses into network locations (usually switch numbers). This file is optional. If your network has one switch or decreasing traffic between switches is not necessary then leave this file empty.

Syntax is:
ADDRESS SWITCH-NUMBER
Lines starting with # character are ignored as comments.
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)
SWITCH-NUMBER can be specified as any positive 32-bit numer.

If one IP belongs to more than one definition then last definition is used.
As for now distance between switches is constant. So distance between machines is calculated as: 0 when IP numbers are the same, 1 when IP numbers are different, but switch numbers are the same and 2 when switch numbers are different
Distances are used to sort chunkservers during read and write operations. And also under goal chunks replications if you enable REPLICATIONS_RESPECT_TOPOLOGY. New chunks are still created randomly. Also rebalance routines do not take distances into account.

Copyright (C) 2018 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

mfsmaster(8), mfsmaster.cfg(5)
July 2018 MooseFS 3.0.101-1

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