Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-yw0-f46.google.com ([209.85.213.46]:47275 "EHLO mail-yw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755618Ab1LAReh convert rfc822-to-8bit (ORCPT ); Thu, 1 Dec 2011 12:34:37 -0500 Received: by ywa9 with SMTP id 9so2028025ywa.19 for ; Thu, 01 Dec 2011 09:34:37 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <20111201172415.GA27626@janus> References: <20111201172415.GA27626@janus> Date: Thu, 1 Dec 2011 19:34:37 +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: 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. 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