[mythtv-users] SSD's for daily myth recordings storage and part time RAID for capacity.

[David Scammell]

Hi there,

I'm considering using a moderate sized ssd for daily myth recordings so
that the larger RAID 5 array drives can be spun down for most of the day,
perhaps only brought up during main telly watching hours or when anyone is
about. I'm expecting the machine to record all the daily kid's programs
with the main RAID array shut off to save on power and heat.

I'd like to copy (rsync/whatever) those recent recordings from SSD to RAID
only when the RAID is spun up. I will be able to clear down sufficient free
space on the SSD for the next days recordings so as to not need to expire
anything straight way, at least at first but I'm struggling to work out how
myth will be able to expire recordings from the RAID array once that gets
full, as it will be available only part time.

I think I can obtain a list of future expirable recordings from the backend
but I don't really want to copy those recording back to the ssd where they
can be expired by the backend during the next day's recordings as it seems
a waste of bandwidth while the RAID is up.

How does anyone else deal with 'part time' disks or arrays and autoexpire?

Thinking out loud, I'm wondering if I can obtain the 'expirelist' and
instruct the backend to 'pre-expire' recordings in the RAID is up to obtain
sufficient free space before copying the most recent recordings from SSD to
RAID?

I'm not really using storage groups in any meaningful way and don't see it
would help me with this, I don't really want to write to the RAID array
directly at all. Saying that I fancy playing with a dedicated kids/film
groups to organize these recordings but that would probably make this
housekeeping all the more complicated.

Any suggestions gratefully received.
thanks dave
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