[mythtv-users] 30 minute freezups

xavier hervy xavier.hervy at bluebottle.com
Fri Dec 19 16:26:19 UTC 2008

Greg Woods wrote:
> Every 30 minutes, my system freezes hard for a couple of seconds. This
> results in a few seconds lost of every recording every half hour, and a
> few seconds pause in any recording I am watching.
> I know the underlying cause of this is the fact that I am using "hdparm"
> to spin down my disks when not in use. I get the same effect when I
> click "Watch Recordings" after the system has been idle for a while.
> There will be a freezeup then too, and the disk access light is solid on
> for the duration of the freezup (as opposed to rapid blinking that
> occurs during disk I/O).
> What I want to discover is what is happening every 30 minutes, and is
> there any way I can stop it or anticipate it and manually spin the
> drive(s) up.
> My system is configured such that the OS and the database are on one
> drive, and the recordings are stored on two separate drives. That may or
> may not be important.
> What I do know is, it's not a cron job. I know this because, if the
> system is rebooted (and all daemons restarted), the point on the clock
> dial where the freezups happen will change. But it is regular every 30
> minutes and will continue at the same point on the clock dial until the
> next restart.
> I suspect it's something that mythbackend is doing; does anyone know if
> there is something that mythbackend does every 30 minutes that might
> spin up a drive that wouldn't be otherwise accessed?
> I know I could stop this by just not spinning down the drives when idle,
> but that would greatly increase the power consumption and I'd like to
> avoid that solution if possible. Unfortunately the freezeups are causing
> the WAF to go down, so simply living with it isn't an option.
> Thanks for any thoughts,
> --Greg
I think upnp is reindexing mythvideo file every 30 minutes. Have you got 
lots of stuff in mythvideo ?

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