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On 09-11-2015 12:39, Heiko Krämer wrote:
> You're right only a hard reboot can solve the problem because SSH
> login or other commands can't be executed because the whole system was
> frozen.

Hello Heiko,

I just want to give some tips about debugging those kind of issues. I had
completely different problem which hanged the machine and I needed to debug it.
Since I couldn't access the logs, I setup kernel debugging to remote server. It
is called netconsole. You may want to setup netconsole listener on one of the
working servers outside of your swift, and setup netconsole on the servers that
hang. Here is the information about how to setup:

https://www.kernel.org/doc/Documentation/networking/netconsole.txt

At least you may be able to see the kernel log just before the machines hang. I
hope you find it useful.

Regards,

-- 
Eren Türkay, System Administrator
https://skyatlas.com/ | +90 850 885 0357

Yildiz Teknik Universitesi Davutpasa Kampusu
Teknopark Bolgesi, D2 Blok No:107
Esenler, Istanbul Pk.34220

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