[mythtv-users] TFW, Error: Write() -- IOBOUND ..... and mythbox crashed

Kevin Kuphal kuphal at dls.net
Thu Oct 18 13:35:45 UTC 2007


On 10/18/07, Ma Begaj <derliebegott at gmail.com> wrote:
> Hi,
>
> I had yesterday three recordings running at the same time (1x pvr150,
> 1x pvr500). At the same time, I was watching a recording. And suddenly
> my mythbox crashed and I had to reset it.
>
> I checked syslog and found nothing, but I found something in
> mythbackend log file:
>
> 2007-10-17 23:32:05.673 TFW, Error: Write() -- IOBOUND begin cnt(2048) free(835)
> 2007-10-17 23:32:10.724 TFW, Error: Write() -- IOBOUND end
> 2007-10-17 23:32:10.731 TFW, Error: Write() -- IOBOUND begin cnt(2048)
> free(1095)
> 2007-10-17 23:32:10.735 TFW, Error: Write() -- IOBOUND end
> 2007-10-17 23:47:10.183 TFW, Error: Write() -- IOBOUND begin cnt(2048)
> free(1503)
>
> I checked the older mythbackend logs and I found more of these
> messages in the last few days, usually when I had 2-3 recordings (SD)
> running and watching at the same time.
>
> I have two IDE hard disks (2x 160GB WD) and 1GB single channel RAM.
> One of these disks has a system and home partitions and a partition
> for myth recordings. 2nd disk is only one partition for recordings.
> Everything is ReiserFS. I was thinking to change it to XFS these days.

The biggest thing I did to solve this problem was to move the /var
partition with the database and logs off the same physical disk that
my recordings are happening on.  Recording and playback generate a
fair amount of MySQL traffic.  This was causing too much contention
for the disks when the same disk is also used for writing recordings.
Do that, and I think this will go away.

Kevin


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