Re: Cannot change RAID array check speed

[David Niklas <simd@vfemail.net>]

Hey,
I think I figured this out. I need to change it via the
sync_speed_min/max. I can't used sync_speed anymore.

Thanks guys!


On Mon, 16 Feb 2026 10:14:52 -0500
simd@vfemail.net wrote:
> It worked with LK 6.9 on Devuan (Debian Stretch) ASCII.
> 
> I upgraded the system, both HW and SW, to Daedalus and I had to go with
> a newer kernel to use the newer Intel iGPU. I'm now on Devuan (Debian
> Bookworm) Daedalus.
> 
> I used to change this value all the time to get the check done faster or
> to slow it down because I needed to access the array.
> 
> Maybe it's a distro security policy? IDK. But as I said, I used to
> change it all the time. That's why there's a sync_speed_min/max, or so
> I thought.
> 
> Thanks,
> David
> 
> PS: Accidentally sent to the user instead of to the list. Sorry.
> 
> 
> On Mon, 16 Feb 2026 06:20:58 +0100
> Dragan Milivojević <galileo@pkm-inc.com> wrote:
> > When did that work?
> > /sys/devices/virtual/ etc
> > is readonly on 4.18,  6.12 and  6.18 (a few boxes that I have).
> > 
> > 
> > 
> > On Mon, 16 Feb 2026 at 04:15, David Niklas <simd@vfemail.net> wrote:  
> > >
> > > Hello,
> > > I upgraded my kernel from 6.9 to 6.17. They're both the "same"
> > > custom config. I tried:
> > >
> > > # echo 200000 > /sys/devices/virtual/block/md7/md/sync_speed
> > > bash: /sys/devices/virtual/block/md7/md/sync_speed: Permission
> > > denied # id
> > > uid=0(root) gid=0(root) groups=0(root)
> > >
> > > This used to work. Any ideas as to what I could have set wrong? I
> > > haven't a clue!
> > >
> > > Is there a security debugging tool or a log-file I could use to
> > > trace this down?
> > >
> > > Thanks,
> > > David
> > >    
> 
>