[mythtv-users] Upgrading backend, need recommendations

[Chris Isip]

Sometimes I have 4 tuners recording at the same time on two hard disks in
LVM on an IDE chain, and dont seem to have problems

On Nov 8, 2007 5:47 PM, gibble <gibble at gmail.com> wrote:

>
>
>
> Bill Omer-2 wrote:
> >
> >> > >
> >> > > If the delay is when you go to the watch recordings screen, could
> it
> >> not be
> >> > > the network?  Or the front end that's causing the delay rather than
> >> the
> >> > > backend?
> >> > >
> >
> >
> > The load on the frontend seems good.  On the backend though, looks
> > like I have some io wait.  Here's a snippet from iostat, looks like my
> > second drive (the one for recordings) is being hit constantly.
> > Running iostat 1, the blk read/wrtn is pretty close to the same
> > figures constantly.   I'm willing to bet by biggest slow down is this
> > ide drive.
> >
> >
> > avg-cpu:  %user   %nice %system %iowait  %steal   %idle
> >            0.00    0.00   20.20   19.19    0.00   60.61
> >
> > Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
> > hda               0.00         0.00         0.00          0          0
> > hdc              51.52      8727.27      2294.95       8640       2272
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> >
> >
> This might be a better explanation...
> http://www.mythtv.org/docs/mythtv-HOWTO-22.html#ss22.5
> --
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Sometimes I have 4 tuners recording at the same time on two hard disks in
LVM on an IDE chain, and dont seem to have problems.   I have experienced
"lost connection to backend" errors but those went away when I switched to
wired ethernet (from wifi).  Also, even on wired ethernet, I find that the
connection will be lost if there is a lot of scp or ssh activity so I
throttled this with a qos script.  The slowness of ui navigation might also
be due to mysql not being optimized.  I noticed speed improvements in
navigation when I started optimizing my mysql database.


Hope this helps
Chris
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