"Dr. Angelo Roussos" <[email protected]> wrote:

> We are having some strange host ‘responsiveness’ issues when executing 
> commands
> whilst logged into a SmartOS host via SSH.

[...]

> As I said, this happens intermittently, and does not appear to be related to
> host load average.
> 
> In situations when this occurs, it also seems that our Zabbix agent on the 
> host
> is impacted and only partially responsive for a period.

[...]

> It seems to us that this may either be some sort of network issue (although
> when the host has been completely unresponsive to commands, it has been
> responding to ICMPs), or (possibly) some sort of memory allocation issue
> related to the global zone.

Are the VMs (or any other processes) on that host impacted? Does
zabbix log any error messages? Can you spawn two instances on that box
and let them e. g. transfer traffic via ttcp between each other and
monitor that?

From where do you login? Is this a LAN connection or could it be path
MTU discovery issues over a WAN connection?

I think, first priority should be to find out whether that's an "inner
machine" or an "external network" issue.

Kind regards,
Toens
-- 
There is no safe distance.


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