system freezes (libata.force=noncq)

[Xen]

Xen schreef op 17-11-2017 21:33:

> There are regular sata_nv write errors

So I feel really dumb for going back on my tracks.



It was unworkable to make a backup of my system (array) in a normal way 
so I had to wait a whopping 12 hours before it had copied 2TB to another 
harddisk in "dsync" mode,

which means to only do synchronized writes, slowing the process down to 
50MB/s.

Otherwise one of the disks would always drop from the array (from the 
entire system really).

Then when I was about to copy 1TB of that back to one of the constituent 
drives I started doubting myself.

Not very smart but yeah.

So I booted this system with "ata.force=nocq" after finding a Fedora bug 
report of someone with the same motherboard who had apparently similar 
issues.

However the issue now is that I have basically invalidated my 12h backup 
by running this system again.

The 'reason' I didn't want to proceed

was because I was a bit unhappy about using this harddrive for doing the 
transition :p (just a second hand drive from someone)      ( and one 
that appears to need to be patched for a firmware bug with SMART tools )



But anyway, on the topic of "listening to bad advice".

The upside if there is any is that if the problems do not actually 
result from using an array, but from the controller itself,

then I would have had the same issues if I had booted from a single 1TB 
disk.

But at least at that point I could have moved ahead with trying this 
solution and hopefully requiring much less time to move it back to the 
array,

also because it would only have been 1TB in that case.

But now I'm stuck again; if the solution is solved, I still want to move 
ahead,

and if the issue is not solved, to be "correct" in my operation I need 
to copy 2TB again ;-).

So now I'm waiting to see if my system is going to do lockups again 
(feels really stupid).

Currently reading the entire array

into /dev/null





And watching dmesg :p.



Oh it's "libata.force=noncq"

Currently reading data at 211 MB/s     (it's two slow 5400 harddisks)

                                        (2 notebook hdds)

I have like 6 of those in my home. I am awash in hard drives lol.



Well sorry for bothering you.