[mythtv-users] Hard Drive Performance

Ryan Steffes rbsteffes at gmail.com
Thu Mar 30 15:53:28 UTC 2006


I've been using my machine for a while now, with only minor problems, so
I've been pretty much leaving it alone (Running a cvs from Julyish).  Lately
though, some of the little things have been annoying me more, so I thought
I'd ask to see if anyone had suggestions.  The primary problems appears to
be my hard drives can't keep up.  I've got 2 IDE drives as hda and hdc, and
a CD burner as hdd.  When I say say can't keep up, I mean that there are
noticable pauses in playback when recording, especially of commercial
flagging or something else is going on in the background.  Sometimes then
something is being recorded during one of these disk usage times the audio
on the recorded program "glitches", and when we go to watch that recording,
there will be a glitch in the video, and all the audio after that glitch has
this weird reverb effect.

The recordings are off a single PVR150 (ivtv version 0.3.8 ).

[root at mythtv mythtv]# hdparm -tT /dev/hdc

/dev/hdc:
 Timing cached reads:   1392 MB in  2.01 seconds = 692.30 MB/sec
 Timing buffered disk reads:  188 MB in  3.00 seconds =  62.63 MB/sec
[root at mythtv mythtv]# hdparm -tT /dev/hda

/dev/hda:
 Timing cached reads:   1368 MB in  2.00 seconds = 683.76 MB/sec
 Timing buffered disk reads:  124 MB in  3.02 seconds =  41.12 MB/sec
[root at mythtv mythtv]# mythbackend --version
0.19.20050712-1
Options compiled in:
 linux release using_v4l using_oss using_alsa using_ivtv using_dbox2
using_lirc using_joystick_menu using_x11 using_xv using_dvdnav using_xrandr
using_frontend using_backend

Filesystem            Size  Used Avail Use% Mounted on
/dev/hdc1             282M  146M  122M  55% /
/dev/mapper/vg-video  395G  343G   53G  87% /home
/dev/mapper/vg-music   20G  7.3G   13G  37% /mnt/music
/dev/hdc5             471M  8.1M  439M   2% /tmp
/dev/hdc6             2.8G  1.5G  1.2G  58% /usr
/dev/hdc2             471M  232M  215M  52% /var


Anyone had any similiar problems, or suggestions?  I, foolishly, didn't put
my drives into a RAID format, and I think they are too full to consider
trying to adjust the lvm to use striping now.  Does anyone have any
suggestions for what might improve performance, or know what might be
causing that reverb?
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