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Full Discussion: High Ping Timeout
Operating Systems AIX High Ping Timeout Post 302689969 by bakunin on Wednesday 22nd of August 2012 10:06:55 AM
Old 08-22-2012
Good advice by zaxxon. Of course it could be a myriad of other reasons: network congestion, switch(router,hub, ....) bottleneck, broadcast storms, or even the temporary drop of bandwidth in a line.

Many years ago, i had a Laser-link as part of my network infrastructure, which mysteriously dropped in bandwidth every day at around 10:30 only to get back to speed at about 14:30 again. Turned out there was a cantina beneath the line of sight, which started to cook at this time and their exhaust air along with the steam from the cooking disturbed the connection, which throttled the bandwidth. It took about 2 months to find this one out, because everybody was busy looking at their network analyzers and nobody looked out the window.

In problems like this the only way is to meticulously describe the "chain of events" (or participating parts) and start to falsify every part of this until one hits the problematic one. And - see above - sometimes it helps to get some fresh air. ;-))

I hope this helps.

bakunin
 

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LEARN ABOUT HPUX

nfs2_nra

nfs2_nra(5)							File Formats Manual						       nfs2_nra(5)

NAME

       nfs2_nra - control the number of read-ahead operations queued by the NFS version 2 client when sequentially accessing a file

VALUES

   Failsafe
   Default
   Allowed values
   Recommended values
       A warning will be issued at runtime if the tunable is set to a value greater than 16 since this is beyond the tested limit.

       This is not a serious warning but just an information message for the administrator.

DESCRIPTION

       controls  the  number  of read-ahead operations that are queued by the NFS version 2 client when sequential access to a file is discovered.
       These read-ahead operations increase concurrency and read throughput.  Each read-ahead request is generally for 8192 bytes of file data.

   Who Is Expected to Change This Tunable?
       The distributed file system administrator should examine this value depending on network bandwidth and memory pressure on the client.

   Restrictions on Changing
       The tunable is dynamic; tuning will take effect immediately on the running system.

   When Should the Value of This Tunable Be Raised?
       If the network is very high bandwidth and the client and server have sufficient resources, increase this value to more effectively  utilize
       the available network bandwidth, the client resources, and the server resources.

   What Are the Side Effects of Raising the Value?
       Tuning incorrectly based on network bandwidth can cause performance problems.

   When Should the Value of This Tunable Be Lowered?
       In a very low bandwidth network, you might want to decrease this value so the NFS client does not overload the network.

   What Are the Side Effects of Lowering the Value?
       Tuning incorrectly based on network bandwidth can cause performance problems.

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by Sun Microsystems, Inc.

SEE ALSO

       kctune(1M), sam(1M), gettune(2), settune(2), nfs3_nra(5), nfs4_nra(5), values(5).

							     Tunable Kernel Parameters						       nfs2_nra(5)
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