Subject: Re: [vserver] 4.9 Kernels Hit Psand Repos
From: Andrew Ruthven <andrew.ruthven@catalyst.net.nz>
Date: Fri, 21 Sep 2018 09:03:39 +1200

 Fri, 21 Sep 2018 09:03:39 +1200
Hey Ben,

Good to hear that you're going to continue with Linux VServer for this
release cycle. I was just pondering last night if I should consider
starting the migration process to LXC, I'll hold off for now!

Cheers,
Andrew

On Thu, 2018-09-20 at 20:34 +0100, Ben Green wrote:
> Hi Andrew,
> 
> great you got that sorted. I'll hopefully be able to be a bit more  
> pro-active with the builds for Stretch, and for Buster, as we've  
> decided not to roll out LXC to productions servers for this release  
> cycle.
> 
> Cheers,
> Ben
> 
> 
> Quoting Andrew Ruthven <andrew.ruthven@catalyst.net.nz>:
> 
> > I decided to try the latest 4.9 kernel again tonight and I tracked
> > down
> > the performance issue I was seeing. iostat was showing one hard
> > drive
> > with utterly terribly wait times, and even running smartctl against
> > that drive was epically slow (all other drives ran normally).
> > 
> > Turns out there was a dodgy SATA cable for that drive. After
> > swapping
> > the cable, I/O on the machine is back to what it should be!
> > 
> > At a guess something has changed in the SATA drivers between 4.1.x
> > and
> > 4.9.y and that change of behaviour triggered the issue I was
> > observing.
> > 
> > Ben, thank you for publishing your kernels!
> > 
> > Cheers,
> > Andrew
> > 
> 
> 
> 
> 
-- 
Andrew Ruthven, Wellington, New Zealand
Data Centre Manager
MIITP, CITPNZ

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