[Openstack] [Swift] block I/O all disks

Mark Kirkwood mark.kirkwood at catalyst.net.nz
Mon Nov 9 20:58:22 UTC 2015

On 10/11/15 00:41, Eren Türkay wrote:
> 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.

Also might be worth looking at using the remote logging capability of 
rsyslog to collect your swift logs on another server, so you can see 
what is/was happening on the swift side of things immediately before any 



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