[mythtv-users] Another TFW, Error: Write() -- IOBOUND

covert covert thecovert at gmail.com
Tue Aug 26 08:41:01 UTC 2008


I am getting the dreaded "TFW, Error: Write() -- IOBOUND" error
showing in my Mythbackend log. I hope someone can tell me what to
check next. Done a few test and here are the results..

While recording 1 x HD stream and 2 x SD streams.

Output from iostat -xk 2 from just before I got a IOBOUND error to just after.

-------
Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s
avgrq-sz avgqu-sz   await  svctm  %util
sda               0.00   754.00   16.50   15.00    66.00  3076.00
199.49     0.14    4.38   4.00  12.60
hdb               0.00     0.00    0.00    0.00     0.00     0.00
0.00     0.00    0.00   0.00   0.00

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          28.33   15.98    5.08   26.39    0.00   24.21

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s
avgrq-sz avgqu-sz   await  svctm  %util
sda               0.00   293.00  144.50   25.00   578.00  1272.00
21.83     1.29    7.59   5.71  96.80
hdb               0.00     0.00    0.00    0.00     0.00     0.00
0.00     0.00    0.00   0.00   0.00

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          26.24   18.56    6.93   22.03    0.00   26.24

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s
avgrq-sz avgqu-sz   await  svctm  %util
sda               0.00   905.00   96.00   24.50   384.00  3718.00
68.08     0.90    7.52   5.68  68.40
hdb               0.00     0.00    0.00    0.00     0.00     0.00
0.00     0.00    0.00   0.00   0.00

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          63.41   18.80    8.27    0.00    0.00    9.52

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s
avgrq-sz avgqu-sz   await  svctm  %util
sda               0.00  1044.50    2.00   97.50     8.00  4568.00
91.98     1.03   10.31   0.74   7.40
hdb               0.00     0.00    0.00    0.00     0.00     0.00
0.00     0.00    0.00   0.00   0.00

--------

Output from hdparm -tT /dev/sda

-------
/dev/sda:
 Timing cached reads:   860 MB in  2.00 seconds = 429.58 MB/sec
 Timing buffered disk reads:  216 MB in  3.02 seconds =  71.47 MB/sec
--------


System specs
4800+ AMD X2
2GB Ram
500GB SATA drive
7300GS
2 x DVB-S
1 x DVB-T


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