From: mehta kiran <kiranmehta1981@yahoo.com>
Subject: RE: Client sees delay  in io when nfs server starts after failover
Date: Tue, 26 Apr 2005 07:12:33 -0700 (PDT)
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To: "Lever, Charles" <Charles.Lever@netapp.com>
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Hi , 
      But client displays message "nfs server not 
      responding" even if following messages are 
      given by rpcinfo.
    
      #rpcinfo -u <server> 100003
       program 100003 version 2 ready and waiting
       program 100003 version 3 ready and waiting
       program 100003 version 4 ready and waiting 

      #rpcinfo -t <server> 100003
       program 100003 version 2 ready and waiting
       program 100003 version 3 ready and waiting
       program 100003 version 4 ready and waiting 

      Should rpc calls over tcp respond  if server
      is not available

thanks,
 --kiran


      
--- "Lever, Charles" <Charles.Lever@netapp.com> wrote:
> >     I am using sles9 sp1 rc5 (2.6.5-7.139 kernel)
> >     NFS server is running on a machines.
> >     Client access server and does moderate amount 
> >     of io on mounted filesystem.
> >     When nfs server switches to other machine , 
> >     nfs client has to wait for 2-3 minutes so as
> >     to continue io on new nfs server.
> >     Sometimes client sees delay of  20-30
> >     seconds only.Why is this difference seen in
> >     different runs/executions.
> >    
> >     Is this the expected behaviour ?
> 
> i'm speculating, but i expect the delay is due to
> the time it takes the
> client TCP layer to reconnect to the new server
> host.  i notice when a
> client loses a TCP connection to a server (even
> without a failover) it
> takes as long as 2-3 minutes to reconnect.  it's on
> my list of things to
> look at improving.
> 

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