From: Blake Golliher <golliher@yahoo-inc.com>
Subject: Re: bug in linux mount? (says NetApp)
Date: Tue, 11 Jul 2006 17:40:14 -0700
Message-ID: <b7c76e8ece93a4f6008145e18efe9ed3@corp.yahoo.com>
References: <44B3F547.9010507@amd.com>
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Cc: autofs@linux.kernel.org, nfs@lists.sourceforge.net
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To: gregory.baker@amd.com
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What version of OnTap are you running?

-Blake

On Jul 11, 2006, at 12:00 PM, Gregory Baker wrote:

>
> We have thousands of linux clients hitting netapp file servers (many
> 3500 series, clustered) on a local gigabit LAN.  From time to time,
> applications return "file not found" when attempting to automount a
> directory and access a file.  An example of this is a long running
> process, which reads in data, processes it for hours (in which time the
> filesystem is unmounted) then tries to read more data from that mount
> point (which causes a "file not found" error in the application).  This
> occurs about 1/100th of the time.
>
> Researching at Netapp turns up this bit by Chuck Lever (Linux NFS
> contributer)
>
> "Using the Linux NFS Client with Network Appliance Filers"
> http://www.netapp.com/libr ary/tr/3183.pdf  (February 2006)
>
> page 10 says...
>
> "Due to a bug in the mount command, the default retransmission timeout
> value on Linux for NFS over TCP is quite small...To obtain standard
> behavior, we strongly recommend using "timeo=600, retrans=2" explicitly
> when mounting via TCP."
>
> Our defaults (assuming man pages are correct, RedHat Enterprise Linux  
> 3)
> would be timeo=7, retrans=3, which translates to 7+14+28+56 = 105  
> tenths
> of a second (10 seconds).  It appears netapp is suggesting waiting
> 600+600 = 1200 tenths (120 seconds) before giving up on the mount  
> command...
>
> * What "bug" in the mount command do you believe NetApp is talking  
> about?
>
> * What do you think proper options for NFS auto/mounts would be for
> extremely busy centralized NFS filers?
>
> * What is the reference standard behavior?
>
> Thanks,
>
> --Greg
>
> --  
> ----------------------------------------------------------------------
> Greg Baker                                         512-602-3287 (work)
> gregory.baker@amd.com                              512-602-6970 (fax)
> 5900 E. Ben White Blvd MS 626                      512-555-1212 (info)
> Austin, TX 78741
>
>
>
>
>
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