09-09-2008
Ok, WHY does it work now?
A problem is not solved when the symptom had gone away. A problem is solved only when it is fully understood what led to it in first place. (This is one of the more awful cognitions gained in 30 years spent in IT business.)
bakunin
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LEARN ABOUT DEBIAN
mhddfs
mhddfs(1) General Commands Manual mhddfs(1)
NAME
mhddfs - The driver combines a several mount points into the single one.
SYNOPSIS
mhddfs /dir1,/dir2[,/path/to/dir3] /path/to/mount [-o options]
mhddfs /dir1 dir2,dir3 /mount/point [-o options]
...
fusermount -u /path/to/mount
fstab record example:
mhddfs#/path/to/dir1,/path/to/dir2 /mnt/point fuse defaults 0 0
mhddfs#/dir1,/dir2,/dir3 /mnt fuse logfile=/var/log/mhddfs.log 0 0
OPTIONS
with an -o option1,option2... you can specify some additional options:
logfile=/path/to/file.log
specify a file that will contain debug information.
loglevel=x
0 - debug messages
1 - info messages
2 - standard (default) messages
mlimit=size[m|k|g]
a free space size threshold If a drive has the free space less than the threshold specifed then another drive will be choosen while creat-
ing a new file. If all the drives have free space less than the threshold specified then a drive containing most free space will be
choosen.
Default value is 4G, minimum value is 100M.
This option accepts suffixes:
[mM] - megabytes
[gG] - gigabytes
[kK] - kilobytes
For an information about the additional options see output of:
mhddfs -h
DESCRIPTION
The file system allows to unite a several mount points (or directories) to the single one. So a one big filesystem is simulated and this
makes it possible to combine a several hard drives or network file systems. This system is like unionfs but it can choose a drive with the
most of free space, and move the data between drives transparently for the applications.
While writing files they are written to a 1st hdd until the hdd has the free space (see mlimit option), then they are written on a 2nd hdd,
then to 3rd etc.
df will show a total statistics of all filesystems like there is a big one hdd.
If an overflow arises while writing to the hdd1 then a file content already written will be transferred to a hdd containing enough of free
space for a file. The transferring is processed on-the-fly, fully transparent for the application that is writing. So this behaviour simu-
lates a big file system.
WARNINGS
The filesystems are combined must provide a possibility to get their parameters correctly (e.g. size of free space). Otherwise the writing
failure can occur (but data consistency will be ok anyway). For example it is a bad idea to combine a several sshfs systems together.
Please read FUSE documentation for a further conception.
COPYRIGHT
Distributed under GPLv3
Copyright (C) 2008 Dmitry E. Oboukhov <dimka@avanto.org>
February 2008 mhddfs(1)