[CentOS] Anyway to ensure SSH availability?

Emmanuel Noobadmin centos.admin at gmail.com
Wed Jun 29 21:31:05 UTC 2011


On 6/30/11, Giovanni Tirloni <gtirloni at sysdroid.com> wrote:
> Linux includes I/O in how it calculates the load average so you're not
> measuring CPU alone.

On the host, it's expected, I've got two qemu-kvm process loading up
100% cpu. Within the guest VM, top looks like this, high load but low
cpu %.

top - 10:21:40 up 1 day, 59 min,  0 users,  load average: 16.72, 6.05, 2.29
Tasks: 176 total,   1 running, 175 sleeping,   0 stopped,   0 zombie
Cpu(s):  3.3%us,  1.2%sy,  1.2%ni, 91.2%id,  2.7%wa,  0.1%hi,  0.2%si,  0.0%st
Mem:   1017392k total,   970564k used,    46828k free,     1436k buffers
Swap:  2040244k total,   200572k used,  1839672k free,    30344k cached

> What does top show?
> Any error messages in /var/log during the time the server is unresponsive?
> Is network responsive? Latency normal too?

I think the network is responsive, pings work but nothing else does.
No error messages in both host and guest. faillog, messages and dmesg
give no clue. Which is why I figured I really need to be logged in,
check and if necessary kill innocent processes one by one until I find
the culprit when it's going crazy.



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