[mythtv-users] Large Drive setup for myth

jack snodgrass mrlinuxgroups at gmail.com
Mon Sep 11 18:47:26 UTC 2006

Maybe my concerns for LVM are unfounded. I am sure that LVM is
'stable' but I'm more concerned with hardware failures.

Say that you have a 1.5TB LVM partition made up of
4-5 drives. What happens to the 1.5TB of data if you
loose one of the drives? Do you loose just the data
on the drive... or do you screw up the whole LVM
partition? How easy is it to get the 1.5TB - less the
failed drive - back up and available?  I'd hate to loose
it all if one of the drives cratered.

I got burned a couple of times with software raid
and now I'm a bit concerned with 'virtual' drives.
My software raid mirrored ( perfectly ) my corrupted
file system. Instead of one bad / corrupted file system,
I had several raid drive copies of it. ;( They mirror
part did work....


On 9/11/06, list at onnow.net <list at onnow.net> wrote:
> My only comment on this ( no expertise on how to make Myth play with
> the partitions ) is that LVM is very stable and reliable.  There
> should be no fear in using it.  I ahve run 1TB plus LVM with no issues.
> The points you address are quite interesting and becoming more and
> more common on this list.  You are at 1.5TB.  I just jumped to 1TB and
> many users are finding the need to add mass storage that is
> affordable.  Let us know how you do as I am sure this will become more
> and more crucial over the months.
> Mark
> Quoting jack snodgrass <mrlinuxgroups at gmail.com>:
> > I use mythtv for HD recordings. The HD shows take up a lot of space (
> > 100 gig for 4
> > football games ) and I might not watch some shows for several days /
> > weeks. I like to
> > keep ALL copies of some shows but I may not watch them for 6 months.
> >
> > So... I end up with data that I can classify into 'active' and
> > 'archive'. I am planning on
> > splitting my 1.5 tera-byte LVM drive into smaller, physical drives. (
> > LVM scares me ) .
> > Another issue I have besides LVM is the noise / heat caused by the
> > drives that make
> > up my LVM partition.
> >
> > To splip up my 1.5TB LVM partion, I am going to change it to something like
> > /opt/store1
> > /opt/store2
> > /opt/store3
> > /opt/store4
> > etc where these are phyical drives. I will use autofs to mount and unmount
> > the drives as needed. If the system doesn't access /opt/store1 for 60 seconds
> > it will be unmounted. I've used autofs for a while and I think it
> > will work fine
> > for this. autofs will have the 'active' stuff mounted and available for
> > immediate access. The 'archive' stuff will be unmounted. When the data
> > is needed, autofs will mount it. There will be a few second delay while
> > the drive is mounted, but I can live with that.
> >
> > What I haven't done and what I plan on looking at is running hdparm on
> > the drives once they are automonted ( or setting up a BIOS timer or
> > a drive setting ) to spin down the drives when they are unmounted. I
> >  think that
> > this will reduce the heat and noise made by the drives.
> >
> > Assuming that I can get this /opt/storeX stuff set up like I want with the
> > autofs and spining down the drives after they have been unmounted,
> > how do I get mythtv to cooporate? Currently, I have /mnt/store. Everything
> > that mythtv does goes on with /mnt/store. How can I make use of
> > multiple /mnt/storeX ( or /opt/storeX ) partitions?
> >
> > Thanks - jack
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> >
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