mythtv-users at phipps-hutton
Sep 22, 2006, 2:31 AM
Views: 573
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Unionfs [was: Multiple Directories for Recordings]
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On Friday 22 September 2006 07:52, Lincoln Dale wrote:
> [.i wasn't subscribed to mythtv-users but saw this thread in the mailing
> list archives. hence reviving a 2 week old thread :)]
> > was wondering if it is possible to spread TV show recordings across
> > multiple directories or disks rather than a single directory.
> if you're prepared to run a SVN-head tree or patch MythTV, YES, this is
> possible. i've been running a multiple-directories-recording patch now for
> over 5 months.
> the plan is for this to be (hopefully) incorporated into myth 0.21.
I've been playing with unionfs as a way of merging multiple directories into
one. It's available in Debian testing in the unionfs-modules-2.6.17-2-686
package now that 2.6.17 is the kernel.
root[at]hal:/tmp# mount -t unionfs -o dirs=/myth:/home unionfs store
root[at]hal:/tmp# df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 9.9G 3.7G 5.8G 40% /
udev 1.0G 2.5M 1022M 1% /dev
/dev/hda2 9.9G 3.7G 5.8G 40% /
/dev/hda3 214G 170G 42G 81% /home
/dev/hdd1 111G 88G 23G 80% /myth
unionfs 324G 257G 65G 80% /dev/shm/tmp/store
The advantages would be:
*) Works with unpatched MythTV.
*) Losing a disk will just lose the recordings on that disk.
*) Migration from the original single disk doesn't require reformatting the
original disk.
But these things stop me using it:
*) All new files get put in the first writeable branch.
*) I don't know what happens when the first branch fills up (autoexpire won't
help if other branches have space).
*) Can't move files from one branch to another without unmounting the union.
That requires shutting down all of Myth.
*) Deletion only supports "whiteout" mode so you end up with a .wh file for
every file ever created. Not sustainable.
I might try it out with the first branch being what was the original store and
the other branches being directories with old "precious" recordings in
loopback filesystems sized to be 100% full and autoexpire turned off for
those recordings. My worry is that autoexpire will get it wrong and either
delete too much or too little (Prime directive: never lose a Coronation
Street episode).
Cheers,
Tim.
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Unionfs [was: Multiple Directories for Recordings]
