Some NFS file transfers fail and hang automounting

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<pre>kernel: Callback slot table overflowed</pre>
<pre>kernel: Callback slot table overflowed</pre>
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If foo is lesser than 10Mb, the problem does'nt occur.
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* The problem doesn't occur if foo has a size less than 10Mb
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After several tries with the source of 50Mb,
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* The final size of bar appears to be random
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the different sizes of the target file "bar" are random.
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This incident occurs with:
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* This incident occurs with: <pre>sunrpc.tcp_slot_table_entries = 16</pre>
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sunrpc.tcp_slot_table_entries = 16
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* This incident does NOT occur with: <pre>sunrpc.tcp_slot_table_entries = 32</pre>
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but after tunning this parameter, all is fine with:
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sunrpc.tcp_slot_table_entries = 32
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Revision as of 14:50, 22 October 2010

Symptoms

  • Given a file "foo" of 50Mb on a remote machine "remote".
    • This command will never finish
      <localmachine $> cp /remote_mount_point/foo bar 
    • bar will have a size less than foo.
    • automounting of the local machine is hung.
  • The following message will show up in /var/log/messages
kernel: Callback slot table overflowed
  • The problem doesn't occur if foo has a size less than 10Mb
  • The final size of bar appears to be random
  • This incident occurs with:
    sunrpc.tcp_slot_table_entries = 16
  • This incident does NOT occur with:
    sunrpc.tcp_slot_table_entries = 32
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