Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-gy0-f174.google.com ([209.85.160.174]:44086 "EHLO mail-gy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755791Ab1LARgE convert rfc822-to-8bit (ORCPT ); Thu, 1 Dec 2011 12:36:04 -0500 Received: by ghrr1 with SMTP id r1so2036861ghr.19 for ; Thu, 01 Dec 2011 09:36:04 -0800 (PST) MIME-Version: 1.0 In-Reply-To: References: <20111201172415.GA27626@janus> Date: Thu, 1 Dec 2011 19:36:03 +0200 Message-ID: Subject: Re: NFS - lock failover From: Pavel A To: Frank van Maarseveen Cc: linux-nfs@vger.kernel.org, wcheng@redhat.com, neilb@suse.de, jlayton@redhat.com Content-Type: text/plain; charset=UTF-8 Sender: linux-nfs-owner@vger.kernel.org List-ID: 2011/12/1 Pavel A : > Thank you very much! This is something I was looking for. > I only wonder, why isn't it included in packages? - I will be of great > help to many other people as well. sorry, _it_ will be of great help to many other people as well. > > 2011/12/1 Frank van Maarseveen : >> On Thu, Dec 01, 2011 at 07:07:22PM +0200, Pavel A wrote: >>> Hi everyone! >>> >>> I was trying not to create new topics, but it seems that posting to an >>> old one doesn't bring it up. Here is the original topic I'm referring >>> to: http://comments.gmane.org/gmane.linux.nfs/13108 >>> >>> I'm building an A/A cluster using NFS v3 and local file systems, and >>> looking for >>> efficient ways for failover (for now I have to restart nfs-kernel-server on >>> Takeover node to be able to initiate grace period), so the discussed solutions >>> are very interesting to me. >>> >>> Now (4 years after) in current nfs-utils packages (v. 1.2.2-4 and later) I can >>> see that the ability to release locks was really implemented and is >>> working well >>> (I mean interfaces /proc/fs/nfsd/unlock_ip and >>> /proc/fs/nfsd/unlock_filesystem), >>> but how about reacquiring locks on the node, share migrates to? - I've been >>> going through various mailing lists and found a lot of discussions on the topic >>> (also dated mainly 2007), but don't seem to find any rpc-based mechanism or >>> interface like /proc/fs/nfsd/nlm_set_grace to do that, was it ever made? >> >> I've posted a patch some time ago implementing >> /proc/fs/nfsd/relock_filesystem: >> >>        http://permalink.gmane.org/gmane.linux.nfs/42360 >>        http://permalink.gmane.org/gmane.linux.nfs/42361 >>        http://permalink.gmane.org/gmane.linux.nfs/42362 >> >> -- >> Frank