[mythtv-users] TFW, Error: Write -- IOBOUND

Kelly Reed Schuerman krschuerman at gmail.com
Mon Jan 8 01:12:07 UTC 2007


On 1/7/07, GARETH GLACCUM <gareth.glaccum at btopenworld.com> wrote:
> I was watching this as I had a similar error. I was using two SATA-II (3GB)
> 250MB drives in a raid-0 stripe for sdb and sdc, sda is a SATA-I for the OS.
> (I currently have 4 transcodes and an update running in the background so my
> figures are a little lower than I would expect)
> I think that for me, as this error only occurred in the first part of the
> transcode, it is due to the spin-up time for my disks (the error that is).
> Once the disk is in the sequential read/write part of the cycle, there were
> no errors.
> Gareth
>
> For comparison:
>
> [root at localhost ~]# hdparm -Tt /dev/sda
>
> /dev/sda:
>  Timing cached reads:   3172 MB in  2.00 seconds = 1586.43 MB/sec
>  Timing buffered disk reads:  174 MB in  3.01 seconds =  57.76 MB/sec
> [root at localhost ~]# hdparm -Tt /dev/sdb
>
> /dev/sdb:
>  Timing cached reads:   2980 MB in  2.00 seconds = 1489.88 MB/sec
>  Timing buffered disk reads:  116 MB in  3.01 seconds =  38.58 MB/sec
> [root at localhost ~]# hdparm -Tt /dev/sdc
>
> /dev/sdc:
>  Timing cached reads:   2960 MB in  2.00 seconds = 1478.78 MB/sec
>  Timing buffered disk reads:  112 MB in  3.00 seconds =  37.31 MB/sec
>
>
> ----- Original Message -----
> /dev/sda:
>  Timing cached reads:   2396 MB in  2.00 seconds = 1197.93 MB/sec
>  Timing buffered disk reads:  218 MB in  3.01 seconds =  72.37 MB/sec
>
> Sherm
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I have been playing with this all afternoon trying to determine the
cause.  As I write this I am watching the process ivtv-enc-vbi bounce
between 45% and 92% CPU usage and there are currently no encoding jobs
running on the backend.

Would it be worth the effort to try an older version of ivtv?

Sherm


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