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Date:      Thu, 10 Jun 2010 18:17:10 +1000
From:      Peter Jeremy <peter@vk2pj.dyndns.org>
To:        Anders Nordby <anders@FreeBSD.org>
Cc:        freebsd-fs@FreeBSD.org
Subject:   Re: Odd network issues on ZFS based NFS server
Message-ID:  <20100610081710.GA64350@server.vk2pj.dyndns.org>
In-Reply-To: <20100609122517.GA16231@fupp.net>
References:  <20100608083649.GA77452@fupp.net> <Pine.GSO.4.63.1006081946040.8742@muncher.cs.uoguelph.ca> <20100609122517.GA16231@fupp.net>

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On 2010-Jun-09 14:25:17 +0200, Anders Nordby <anders@FreeBSD.org> wrote:
>Thanks. The only thing that (temporarily) solves this issue so far is
>rebooting, which helps only for a day or so. I have tried different
>NICs, replacing the physical server, replacing cables, changing and
>resetting switch ports. But it did not help, so I think this is a
>software problem. I will try zio_use_uma =3D 0 I think, and then try to
>limit vfs.zfs.arc_max to 100 MB or so.

I wonder if your system is running out of free RAM.  How would you
like to monitor "inactive", "cache" and "free" from either "systat -v"
or "vmstat -s" whilst the problem is occurring.

Does something like
  perl -e '$x =3D "x" x 10000000;'
temporarily correct the problem?

--=20
Peter Jeremy

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