From: Dan Stromberg <strombrg@dcs.nac.uci.edu>
Subject: Re: Extremely high load on NFS clients wen the NFS server is
	down...
Date: Wed, 18 May 2005 11:52:13 -0700
Message-ID: <1116442333.25985.57.camel@seki.nac.uci.edu>
References: <200505181429.j4IET8GK023074@s7.stat.tamu.edu>
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Cc: strombrg@dcs.nac.uci.edu, nfs@lists.sourceforge.net
To: Henrik Schmiediche <henrik@stat.tamu.edu>
In-Reply-To: <200505181429.j4IET8GK023074@s7.stat.tamu.edu>
Sender: nfs-admin@lists.sourceforge.net
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On Wed, 2005-05-18 at 09:28 -0500, Henrik Schmiediche wrote:
>     Hello,
> I have two Redhat AS3 servers. One of them (among other things) serves NF=
S
> file systems to my other systems including to the other server. When my N=
FS
> file server goes down or is restarted the load on the other AS3 server
> increases to the point it is completely useless (it goes to 50+ in a minu=
te
> or two). I never observed this behavior when I was serving NFS file syste=
ms
> using a Solaris system.
>=20
> Has anyone observed this phenomenon?  Any solution to it?
>=20
> Sincerely,
>=20
>    - Henrik

I've seen this a number of times.  In fact, I just sorted out such a
situation again over the weekend - but running jack the ripper to get a
list of accounts with bad passwords, and digging up one that had a local
shell, rather than a shell on NFS.

Far from a fix, but this program can help a lot when the load on a
system gets so high, and the NFS timeouts are so bad, that you cannot
ssh in or get any other form of interactive shell:

http://dcs.nac.uci.edu/~strombrg/fallback-reboot/

In fact, it can often even allow you reboot a system when the system's
hard disks have gone temporarily useless.

(Yes, it's a shameless plug of my own program :)


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