1mhddfs(1)                   General Commands Manual                  mhddfs(1)
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NAME

6       mhddfs  -  The  driver  combines a several mount points into the single
7       one.
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SYNOPSIS

10        mhddfs /dir1,/dir2[,/path/to/dir3] /path/to/mount [-o options]
11        mhddfs /dir1 dir2,dir3 /mount/point [-o options]
12        ...
13        fusermount -u /path/to/mount
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15   fstab record example:
16       mhddfs#/path/to/dir1,/path/to/dir2 /mnt/point fuse defaults 0 0
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18       mhddfs#/dir1,/dir2,/dir3 /mnt fuse logfile=/var/log/mhddfs.log 0 0
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OPTIONS

22       with an -o option1,option2...  you can specify some additional options:
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25   logfile=/path/to/file.log
26       specify a file that will contain debug information.
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28
29   loglevel=x
30       0 - debug messages
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32       1 - info messages
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34       2 - standard (default) messages
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36   mlimit=size[m|k|g]
37       a free space size threshold If a drive has the free space less than the
38       threshold  specifed then another drive will be choosen while creating a
39       new file.  If all the drives have free space less  than  the  threshold
40       specified then a drive containing most free space will be choosen.
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42       Default value is 4G, minimum value is 100M.
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44       This option accepts suffixes:
45              [mM] - megabytes
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47              [gG] - gigabytes
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49              [kK] - kilobytes
50
51       For an information about the additional options see output of:
52              mhddfs -h
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54

DESCRIPTION

56       The file system allows to unite a several mount points (or directories)
57       to the single one. So a one big filesystem is simulated and this  makes
58       it  possible  to combine a several hard drives or network file systems.
59       This system is like unionfs but it can choose a drive with the most  of
60       free  space,  and  move  the  data between drives transparently for the
61       applications.
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63       While writing files they are written to a 1st hdd until the hdd has the
64       free  space  (see  mlimit  option), then they are written on a 2nd hdd,
65       then to 3rd etc.
66
67       df will show a total statistics of all filesystems like there is a  big
68       one hdd.
69
70       If  an  overflow  arises  while writing to the hdd1 then a file content
71       already written will be transferred to a hdd containing enough of  free
72       space  for  a  file.  The  transferring  is processed on-the-fly, fully
73       transparent for the application that is writing. So this behaviour sim‐
74       ulates a big file system.
75
76   WARNINGS
77       The  filesystems  are  combined must provide a possibility to get their
78       parameters correctly (e.g. size of free space). Otherwise  the  writing
79       failure can occur (but data consistency will be ok anyway). For example
80       it is a bad idea to combine a several sshfs systems together.
81
82       Please read FUSE documentation for a further conception.
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86       Distributed under GPLv3
87
88       Copyright (C) 2008 Dmitry E. Oboukhov <dimka@avanto.org>
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92                                 February 2008                       mhddfs(1)
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