[CentOS] Anyway to ensure SSH availability?

Giovanni Tirloni gtirloni at sysdroid.com
Thu Jun 30 16:25:23 UTC 2011


On Thu, Jun 30, 2011 at 4:38 AM, Alexander Dalloz <ad+lists at uni-x.org>wrote:

> Am 30.06.2011 08:36, schrieb Steve Barnes:
> >> Although it would really be interesting to me to see scheduler settings
> that would indeed allow something of a 'privileged' ssh or an OOB console
> that would be responsive even under a punishing load with lots of swapping,
> which is what the OP originally asked about.
> >
> > I'd be interested to hear thoughts on this. We have a small 1U test
> server with 2 entry-level SATA drives that was brought to its knees twice
> this week by an overzealous Java process. Load averages were up around 60+
> and as a result, SSH access would timeout. I don't know if this behaviour is
> typical across operating systems, but it's frustrating to find yourself
> locked out a server just because a single process went to town on the i/o
> subsystem.
> >
> > Cheers
> >
> > Steve
>
> CentOS 6 will support cgroups, by which you can control cpu, memory and
> I/O.
>
> http://www.mjmwired.net/kernel/Documentation/cgroups.txt
>
> http://www.mjmwired.net/kernel/Documentation/cgroups/blkio-controller.txt


Just tried the disktop.stp script on a Linux 2.6.38 and it looks nice. The
possibilities! :)

http://sourceware.org/systemtap/examples/io/disktop.stp

-- 
Giovanni Tirloni
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