From: "J. Bruce Fields" <bfields@fieldses.org>
To: DENIEL Philippe <philippe.deniel@cea.fr>
Cc: linux-nfs@vger.kernel.org
Subject: Re: Effect of NFS4ERR_DELAY on the client
Date: Thu, 14 Oct 2010 10:11:42 -0400 [thread overview]
Message-ID: <20101014141142.GD24146@fieldses.org> (raw)
In-Reply-To: <4CB6EE0D.5060303@cea.fr>
On Thu, Oct 14, 2010 at 01:48:29PM +0200, DENIEL Philippe wrote:
> Hi,
>
> I have a question about NFS4ERR_DELAY. What is the behavior of the
> client when such an error is returned. Does it retry ? If yes, how
> many times and with what kind of interval between each retry ?
> Is the behavior similar to what the NFSv3 client when receiving
> NFS3ERR_JUKEBOX ?
> My purpose is to run NFSv4.x on top of a namespace whose entries can
> be migrated : opening a file may require staging it (in this case
> NFS4ERR_DELAY and NFS3ERR_JUKEBOX will be returned)
For the linux client, see fs/nfs/nfs4proc.c:nfs4_delay() and
nfs4_handle_exception(): looks like it starts with NFS4_POLL_RETRY_MIN
== .1 second, and doubles it each time up to NFS4_POLL_RETRY_MAX == 15
seconds.
--b.
prev parent reply other threads:[~2010-10-14 14:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-14 11:48 Effect of NFS4ERR_DELAY on the client DENIEL Philippe
2010-10-14 14:11 ` J. Bruce Fields [this message]
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