[mythtv-users] monthly madam checkarray kills recordings

[Hika van den Hoven]

Hoi scram69,

Monday, May 7, 2018, 1:47:47 AM, you wrote:





> On Sun, May 6, 2018 at 4:34 PM, Jerry <mythtv at hambone.e4ward.com> wrote:

> On Sun, May 6, 2018 at 7:23 PM scram69 <scram69 at gmail.com> wrote:





> On Sun, May 6, 2018 at 2:26 PM, Gary Buhrmaster
> <gary.buhrmaster at gmail.com> wrote:

> On Sun, May 6, 2018 at 4:27 PM, scram69 <scram69 at gmail.com> wrote:
 >> It's the first Sunday of the month, so I've just gone through the first raid
 >> checkarray re-sync on Ubuntu 18.04, having just upgraded from 14.04.
 >> /etc/cron.d/mdadm runs checkarray with the --idle argument, presumably so as
 >> not to kill disk performance for other processes.
 >>
 >> However, during the array check, all recordings failed with
 >> threadedfilewriter errors:
>  
>  "Idle" has different meanings to different apps.
>  You might want to throttle the max i/o rate for
>  sync (a good value will depend on your devices)
>  
>      dev.raid.speed_limit_max
>  
>  is likely the sysctl to look at.



> Thanks Gary.  I still have my old 14.04 system drive mounted. 
> Before I sysctl -w dev.raid.speed_limit_max=some_small_number, do
> you know where I might be able to find what the max speed limit was under Ubuntu 14.04?


> cat /proc/sys/dev/raid/speed_limit_max


> should do it :)
>  

> Right - that would work if I were actually booted under my old
> system (AMD64).   Unfortunately, I've upgraded both hardware (kaby
> lake) and OS, and can no longer boot up with that drive.  With the
> drive mounted on my new system I can inspect and copy files, but /proc is empty.


> I sincerely doubt I ever changed that limit under 14.04.  However,
> I've googled around for quite a while and can't seem to find what the default was.


> So I guess I'll just try a factor of ten: 200,000 -> 20,000 and see what happens in June...

I don't know if sysctl is managed the same way under ubuntu as under
gentoo. Every setting there must be set on every boot and those are
kept on Gentoo in /etc/sysctl.conf and/or /etc/sysctl.d/*.conf


Tot mails,
  Hika                            mailto:hikavdh at gmail.com

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