[mythtv-users] Storage groups to solve I/O wait
Taco Mel
taco_mel at yahoo.com
Tue Aug 21 04:29:49 UTC 2007
> Have you chase-played an HD recording successfully
before? Or was this
> the first time, and you saw this hesitation?
This was the first time on an essentially brand new
setup, since I have only had a HD-capable front end
for a couple days now.
> My suggestion would be, while you are
"chase-playing" an HD recording,
> and recording something else on the PVR500, open a
console window and
> run iostat -xd 2, and look at your numbers under the
columns "svctm" and
> "%util". (Note: iostat was not part of my standard
FC6 install, I had
> to download it separately, I think from the extras
repository; check to
> see if it's included in your distro.)
I grabbed the "sysstat" package which contains this
tool. Just for fun I kicked it off (right now one SD
recording and one commercial flag jobs are going) and
got about 50% utilization with around 2.2 MB/s read
and 1.2 MB/s write (iostat -xdm 2). Just for fun I
started up a "dd if=/dev/zero of=/storage/foo bs=1024
count=500000" and got 100% utilization with 0.2 MB/s
read and 4.9 MB/s write. (In contrast, to an IDE
drive I stuck in, I got 32 MB/s write at 100%
utilization.)
So, I will be approaching this as an issue with the
3ware settings, rather than something that takes a
complicated MythTV workaround. Thanks for that tip.
____________________________________________________________________________________
Be a better Globetrotter. Get better travel answers from someone who knows. Yahoo! Answers - Check it out.
http://answers.yahoo.com/dir/?link=list&sid=396545469
More information about the mythtv-users
mailing list