Re: bug in linux mount? (says NetApp)

["Gregory Baker" <gregory.baker@amd.com>]

We have various versions; 3500 and R series are running 7.x, the older 
840/880 are running 6.5.x

  NetApp Release 7.0.2P4: Wed Nov 30 01:52:11 PST 2005 charity.amd.com
  NetApp Release 7.0.3P4: Sat Jan 28 06:03:18 PST 2006 chang.amd.com
  NetApp Release 6.5.5P7: Thu Jul 21 02:10:50 PDT 2005 diego.amd.com
  NetApp Release 7.0.3P4: Sat Jan 28 06:03:18 PST 2006 eng.amd.com
  NetApp Release 6.5.5P7: Thu Jul 21 02:10:50 PDT 2005 escher.amd.com
  NetApp Release 6.5.5P7: Thu Jul 21 02:10:50 PDT 2005 faith.amd.com
  NetApp Release 6.5.6P10D3:Thu Apr 13 22:13:21 PDT 2006 fortitud.amd.com
  NetApp Release 6.5.5P7: Thu Jul 21 02:10:50 PDT 2005 frida.amd.com
  NetApp Release 6.5.5P7: Thu Jul 21 02:10:50 PDT 2005 hope.amd.com
  NetApp Release 6.5.5P7: Thu Jul 21 02:10:50 PDT 2005 justice.amd.com
  NetApp Release 7.0.3P4: Sat Jan 28 06:03:18 PST 2006 kuching.amd.com
  NetApp Release 6.5.5P7: Thu Jul 21 02:10:50 PDT 2005 okeeffe.amd.com
  NetApp Release 7.0.2P4: Wed Nov 30 01:52:11 PST 2005 prudence.amd.com
  NetApp Release 6.5.5P7: Thu Jul 21 02:10:50 PDT 2005 raffael.amd.com
  NetApp Release 7.0.3P4: Sat Jan 28 06:03:18 PST 2006 siam.amd.com
  NetApp Release 6.5.5P7: Thu Jul 21 02:10:50 PDT 2005 sobriety.amd.com
  NetApp Release 6.5.5P7: Thu Jul 21 02:10:50 PDT 2005 vangogh.amd.com
  NetApp Release 7.2RC1: Wed Feb 15 00:46:09 PST 2006 jacen.amd.com
  NetApp Release 7.2RC1: Wed Feb 15 00:46:09 PST 2006 jaina.amd.com

--Greg

Blake Golliher wrote:
> 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
>>
>>
>>
>>
>>
>> -------------------------------------------------------------------------
>> Using Tomcat but need to do more? Need to support web services, security?
>> Get stuff done quickly with pre-integrated technology to make your job 
>> easier
>> Download IBM WebSphere Application Server v.1.0.1 based on Apache 
>> Geronimo
>> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
>> _______________________________________________
>> NFS maillist  -  NFS@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/nfs
>>
>>
> 

-- 
----------------------------------------------------------------------
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





-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
_______________________________________________
NFS maillist  -  NFS@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nfs