[mythtv-users] Confused about secondary backend storage - howto use it (trunk)?

[Jose Bernardo Silva]

Hi,
I hope I can explain myself clearly.
I have a master (and until a week ago only) backend, with two storage
dirs, let's call them /var/myth and /media/myth1, on separate HDs on
the same machine. I've added a secondary backend with a almost unused
160GB home partition. I set that up as a storage group on that
backend, /home/myth.
So I have:
Master
- /var/myth
- /media/myth

Secondary
- /home/myth

My problems:
1 - I'd like the secondary /home/myth always leave 10 GB free, can I
set that independently?
2 - transcoding fails frequently, as the master tries to use the
secondary to transcode files recorded on the master, and tries to
transcode on the master files recorded on the secondary. I've set the
"transcode only on same backend" option, but still this happens. What
can I do?
3 - how can I archive on the master files recorded on the slave?
4 - I have a frontend, with 120GB free, but which is only on when
watching tv or movies. What is the better way to use the free storage
on that one? I don't want a "permanent" mount as it won't be always
on.

Thanks!