On Thu, Nov 7, 2019 at 3:57 PM van Sleeuwen, Berry
<[email protected]> wrote:
>
> Hi All,
>
> I have installed an Ubuntu 19-04 but as it turns out the application requires
> version 18-04. So I have installed a new 18-04 system.
>
> Next I tried to move the LVM from the 19-04 machine into the 18-04 machine.
> But I can’t get the disks online. The first few disks are fine but at a
> certain point the server crashes. During “chccwdev -e” at some point all
> memory is exhausted and I see a lot of CPU and IO. Eventually the OOM-killer
> kicks in to kill various processes. The server is no longer responding and
> only a reboot (force and xautolog) will get the server back online.
Hi Berry,
I have myself enabled hundreds of dasds without such issues, so it
must be something special to your system/config that we have to find
out.
We all know that chccwdev shouldn't do any I/O other than to the
entries in /sys so I'm wondering what goes on.
You said you have a lot of CPU+IO and then the OOM-killer kicks in.
Can you outline
a) which processes spin when being CPU intensive - gather with e.g.
top in batch mode
b) which processes drive that I/O - gather with iotop
(btw - do you see that I/O in VM or in Linux)
c) when the OOM killer kicks in (or if you can before) which processes
consume huge chunks of memory?
If you have nothing else, at least the OOM report that dmesg holds
should have a list.
>From there we can start to gather ideas what it might be.
Kind Regards,
Christian
> Next I have added a new range of disks instead of reusing the old.
> Unfortunately with the empty disks I got into the same situation. But
> eventually, after formatting the disks one-by-one, I was able to get a new
> filesystem available. Even during reboot the new filesystem is activated
> without a problem. So it looks like for some reason the problem went away.
> But when I add another filesystem the machine once again crashes during
> activation of the disks.
>
> What could cause this to happen? I am reluctant to hand over this machine as
> we might get into the same problem when we need to add additional disks.
>
> Met vriendelijke groet/With kind regards/Mit freundlichen Grüßen,
> Berry van Sleeuwen
> Flight Forum 3000 5657 EW Eindhoven
> • +31 (0)6 22564276
> [cid:[email protected]]
> [cid:[email protected]]
>
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--
Christian Ehrhardt
Staff Engineer, Ubuntu Server
Canonical Ltd
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