From: "Lever, Charles" <Charles.Lever@netapp.com>
Subject: RE: Client sees delay  in io when nfs server starts after failover
Date: Tue, 26 Apr 2005 07:03:54 -0700
Message-ID: <482A3FA0050D21419C269D13989C611308539A30@lavender-fe.eng.netapp.com>
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Cc: <nfs@lists.sourceforge.net>
To: "mehta kiran" <kiranmehta1981@yahoo.com>
Sender: nfs-admin@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

>     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=20
>     of io on mounted filesystem.
>     When nfs server switches to other machine ,=20
>     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.
>   =20
>     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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