[OmniOS-discuss] Failing zfs send / receive

[Chris Nagele]

Hi Michael,

I tried those settings with no luck. I also tested network latency,
routes, throughput with netperf, etc. The network side is perfectly
fine with no packet loss over a long period of time.

What I do see is ssh hanging for 10 seconds or so if I run commands
over it. For instance, if I run "ssh -vvv host ls -l" a bunch of times
it is usually very fast, but will hang every 30 times for several
seconds.

Due to the way our backups work we run a lot of remote ssh commands
(100+ every 60 seconds). Is there something we could try in terms of
increasing ssh performance? Or is there anything else I can look at to
troubleshoot?

Thanks for the help.

Chris

On Thu, Dec 26, 2013 at 12:52 PM, Michael Rasmussen <mir at miras.org> wrote:
> On Thu, 26 Dec 2013 12:31:30 -0500
> Chris Nagele <nagele at wildbit.com> wrote:
>
>>
>> Any ideas what could cause this timeout or if it is something I can increase?
>>
> Do you have this config in sshd_config on the remote side:
> GSSAPIAuthentication no
>
> If GSSAPIAuthentication is active you sometimes see timeouts cause by
> the remote side waiting for GSSAPIAuthentication which by default first
> will timeout after 20 sec.
>
> Other configs of interest:
> LookupClientHostnames no
> VerifyReverseMapping no
>
> --
> Hilsen/Regards
> Michael Rasmussen
>
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> mir <at> miras <dot> org
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