From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: linux-nfs-owner@vger.kernel.org Received: from frankvm.xs4all.nl ([83.163.148.79]:60704 "EHLO janus.localdomain" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755630Ab1LARaj (ORCPT ); Thu, 1 Dec 2011 12:30:39 -0500 Date: Thu, 1 Dec 2011 18:24:16 +0100 From: Frank van Maarseveen To: Pavel A Cc: linux-nfs@vger.kernel.org, wcheng@redhat.com, neilb@suse.de, jlayton@redhat.com Subject: Re: NFS - lock failover Message-ID: <20111201172415.GA27626@janus> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: Sender: linux-nfs-owner@vger.kernel.org List-ID: 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