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#1 (**permalink**) 01-16-2008, 11:08 AM

Hi All,

We've been seeing some weirdness on one of our nfs clusters with
gigabit interfaces for the public network connections. The machines are
4500s (so we have sbug ge cards) on solaris 8 108528-18. Under a
certain amount of load, we begin to see input errors accumulate a
significant ratio to successful packets reflected via netstat -i on the
nfs server. We dont see any evidence of the issue on our switches. The
curious bit is, we've changed cables/switch ports/etc. with no luck. If
i fail over the resource group to another node in the cluster - the
errors follow the load. I'm wondering if it could be a bogus nfs client
(all clients are running 108528-18 as well). Average throughput on the
interfaces is about 5 mb/sec when this begins to occur, but can be even
lower. When there is much more limited nfs traffic, the errors don't
occur at all. Any ideas?

tia - justin

--
Justin

#2 (**permalink**) 01-16-2008, 11:08 AM

Justin Shaffer <shafferj@mac.com> wrote in message news:<250920031509103588%shafferj@mac.com>...
> Hi All,
>
> We've been seeing some weirdness on one of our nfs clusters with
> gigabit interfaces for the public network connections. The machines are
> 4500s (so we have sbug ge cards) on solaris 8 108528-18. Under a
> certain amount of load, we begin to see input errors accumulate a
> significant ratio to successful packets reflected via netstat -i on the
> nfs server. We dont see any evidence of the issue on our switches. The
> curious bit is, we've changed cables/switch ports/etc. with no luck. If
> i fail over the resource group to another node in the cluster - the
> errors follow the load. I'm wondering if it could be a bogus nfs client
> (all clients are running 108528-18 as well). Average throughput on the
> interfaces is about 5 mb/sec when this begins to occur, but can be even
> lower. When there is much more limited nfs traffic, the errors don't
> occur at all. Any ideas?
>
> tia - justin

Hey,

is this sun cluster 3.0? You have many NFS-Directorys? Try ha-nfs+ (plus),
a SUN addon to the cluster, it is for heavy loaded NFS-Services.

CU
Klaus Grote

#3 (**permalink**) 01-16-2008, 11:08 AM

Justin Shaffer <shafferj@mac.com> wrote:
> Hi All,

> We've been seeing some weirdness on one of our nfs clusters with
> gigabit interfaces for the public network connections. The machines are
> 4500s (so we have sbug ge cards) on solaris 8 108528-18. Under a
> certain amount of load, we begin to see input errors accumulate a
> significant ratio to successful packets reflected via netstat -i on the
> nfs server. We dont see any evidence of the issue on our switches.

What does netstat -k <interface> show?

rick jones
--
a wide gulf separates "what if" from "if only"
these opinions are mine, all mine; HP might not want them anyway...

feel free to post, OR email to raj in cup.hp.com but NOT BOTH...

#4 (**permalink**) 01-16-2008, 11:09 AM

Sooooo... here is whatwe found. Thanks for the netstat -k
recommendation - i dont know why that didnt occur to us before.
Basically, when ge_queue_cnt goes up - we see the ge_queue_full_cnt
increment. After analysing the traffic a bit more, it looks just like a
rate issue on the interface - not a bandwidth issue - due to the large
number of stats coming across the interface.

Regards,

Justin

In article <So_cb.5789$nT3.5692@news.cpqcorp.net>, Rick Jones
<foo@bar.baz.invalid> wrote:

> Justin Shaffer <shafferj@mac.com> wrote:
> > Hi All,
>
> > We've been seeing some weirdness on one of our nfs clusters with
> > gigabit interfaces for the public network connections. The machines are
> > 4500s (so we have sbug ge cards) on solaris 8 108528-18. Under a
> > certain amount of load, we begin to see input errors accumulate a
> > significant ratio to successful packets reflected via netstat -i on the
> > nfs server. We dont see any evidence of the issue on our switches.
>
> What does netstat -k <interface> show?
>
> rick jones

--
Justin Shaffer

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