<div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Sun, May 6, 2018 at 7:48 PM scram69 <<a href="mailto:scram69@gmail.com">scram69@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Sun, May 6, 2018 at 4:34 PM, Jerry <span dir="ltr"><<a href="mailto:mythtv@hambone.e4ward.com" target="_blank">mythtv@hambone.e4ward.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_quote"><span><div dir="ltr">On Sun, May 6, 2018 at 7:23 PM scram69 <<a href="mailto:scram69@gmail.com" target="_blank">scram69@gmail.com</a>> wrote:<br></div></span><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><span><br><div class="gmail_quote">On Sun, May 6, 2018 at 2:26 PM, Gary Buhrmaster <span dir="ltr"><<a href="mailto:gary.buhrmaster@gmail.com" target="_blank">gary.buhrmaster@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span>On Sun, May 6, 2018 at 4:27 PM, scram69 <<a href="mailto:scram69@gmail.com" target="_blank">scram69@gmail.com</a>> wrote:<br>
> It's the first Sunday of the month, so I've just gone through the first raid<br>
> checkarray re-sync on Ubuntu 18.04, having just upgraded from 14.04.<br>
> /etc/cron.d/mdadm runs checkarray with the --idle argument, presumably so as<br>
> not to kill disk performance for other processes.<br>
><br>
> However, during the array check, all recordings failed with<br>
> threadedfilewriter errors:<br>
<br>
</span>"Idle" has different meanings to different apps.<br>
You might want to throttle the max i/o rate for<br>
sync (a good value will depend on your devices)<br>
<br>
dev.raid.speed_limit_max<br>
<br>
is likely the sysctl to look at.<br></blockquote></div><br clear="all"></span><span><div>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?</div></span></div></div></blockquote><div><br>cat /proc/sys/dev/raid/speed_limit_max<br><br></div><div>should do it :)<br></div></div></div>
<br></blockquote></div>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.</div><div class="gmail_extra"><br></div><div class="gmail_extra">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.</div><div class="gmail_extra"><br></div><div class="gmail_extra">So I guess I'll just try a factor of ten: 200,000 -> 20,000 and see what happens in June...</div><div class="gmail_extra"><br></div></div></blockquote><div><br></div><div>Sorry, I misread your email. I guess you can't check that old value.<br><br>Maybe somehow you could with a VM? Or with chroot and QEMU? <a href="https://unix.stackexchange.com/questions/292433/chroot-into-a-different-architecture">https://unix.stackexchange.com/questions/292433/chroot-into-a-different-architecture</a> has a sketchy outline.<br><br></div><div>I haven't tried this (yet). I've been tempted to with microSD cards from my ARM machines though.<br></div><div><br>FWIW, I have 200,000 on my Fedora 28 system.<br></div></div></div>