[mythtv-users] Unionfs [was: Multiple Directories for Recordings]
ltd at interlink.com.au
Fri Sep 22 10:02:02 UTC 2006
> I've been playing with unionfs as a way of merging multiple directories
> 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.
unionfs has been around for a while. while i haven't tracked linux-kernel
recently, it was previously in a state where linux-vfs folks wouldn't accept
> The advantages would be:
> *) Works with unpatched MythTV.
well - not as if patching mythtv is hard. :)
i run all sorts of custom patches anyhow.
> *) Losing a disk will just lose the recordings on that disk.
the patch in trac ticket #1744 also means this.
> *) Migration from the original single disk doesn't require reformatting
> the > original disk.
neither does the patch in trac ticket #1744
> But these things stop me using it:
> *) All new files get put in the first writeable branch.
the trac patch in ticket #1744 will write across all directories.
> *) I don't know what happens when the first branch fills up (autoexpire
> won't help if other branches have space).
the trac patch in ticket #1744 won't break auto-expire.
> *) Can't move files from one branch to another without unmounting the
> That requires shutting down all of Myth.
no shutdown of myth is necessary. the only clueful thing is to avoid moving
a file as it is being written to or read from.. not exactly too hard..
> *) Deletion only supports "whiteout" mode so you end up with a .wh file
> for every file ever created. Not sustainable.
sounds like you _should_ be running my patch. :)
> root at hal:/tmp# df -h
> Filesystem Size Used Avail Use% Mounted on
> unionfs 324G 257G 65G 80% /dev/shm/tmp/store
well - here i just have RecordFilePrefix set to
# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/hdc1 307663800 256848532 50815268 84% /media1
/dev/hda5 159963408 18832852 141130556 12% /media2
/dev/hdb1 192292124 182551740 9740384 95% /media3
/dev/sda1 292994784 243960524 49034260 84% /media4
/dev/sdb1 292994784 243565088 49429696 84% /media5
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