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

[Ma Begaj]

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.


I run "hdparm -tT" and they are more or less the same for both disks:
root at mythbox:/tmp# hdparm -Tt /dev/hd[ab]

/dev/hda:
 Timing cached reads:   1332 MB in  2.00 seconds = 666.17 MB/sec
 Timing buffered disk reads:  136 MB in  3.03 seconds =  44.81 MB/sec

/dev/hdb:
 Timing cached reads:   1090 MB in  2.00 seconds = 545.26 MB/sec
 Timing buffered disk reads:  172 MB in  3.02 seconds =  56.97 MB/sec

not pretty fast? this
http://readlist.com/lists/mythtv.org/mythtv-users/7/39724.html has the
same problem, and the disks have two or almost three times higher
"Timing cached reads".

any ideas? I could buy new disk(s), but I think that these disks
should be handle 2-3 recordings and 1 reading at the same time.

Thanks

M.