From: mehta kiran <kiranmehta1981@yahoo.com>
Subject: RE: lockd grace period
Date: Mon, 31 Jan 2005 06:36:10 -0800 (PST)
Message-ID: <20050131143610.1250.qmail@web51604.mail.yahoo.com>
References: <395A443A7CBF0246843BFD3471A8231DC0176D@bgeexc04.asiapacific.cpqcorp.net>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: nfs@lists.sourceforge.net
To: Steve Dickson <SteveD@redhat.com>,
	"Aswathanarayana, Chetan (STSD)" <chetan.aswathanarayana@hp.com>
In-Reply-To: <395A443A7CBF0246843BFD3471A8231DC0176D@bgeexc04.asiapacific.cpqcorp.net>
Sender: nfs-admin@lists.sourceforge.net
Errors-To: nfs-admin@lists.sourceforge.net

Hi , 
          this means that if  lockd alone is running
since a long time and if now i start nfsd , lockd will
enter grace period and hence reclaim request
will only be served for grace period interval

In example given by chetan :
      I think  if reclaim request arrive after grace
period,it will be considered as normal lock request , 
and if lock has already been acquired by some other
client (between grace period end  and request arrival)
, appropriate error will be returned to 
requestor.

--thanks , 
   kiran


--- "Aswathanarayana, Chetan (STSD)"
<chetan.aswathanarayana@hp.com> wrote:

> Steved wrote :
> 
> > Yes and Yes... When a NFS server is restarted,
> there is a grace period
> in which the server (i.e. lockd) will accept
> reclaimed locks.
> > And it appears that reclaimed locks will also be
> accepted after the
> grace period expires 
> 
> I think reclaim locks should not be accepted after
> the grace period
> expires, because it can cause data corruption.
> 
> Say, a reclaim request arrives after grace period
> and get's lock. There
> will be time frame between end of grace period and
> arrival of
> Reclaim request, in which case any thing can
> happen(ex: a new request
> could be granted, it may make some changes to a file
> and unlock by the
> time Reclaim arrives).
> 
> In which case reclaim thinks that it was the same
> original file it had
> last locked.
> 
> So reclaim after grace period is not a good idea.
> 
> Mehta's question :
> 
> >What is the expected behaviour.?
> >Is it that whenever nfsd starts  , lockd should
> enter grace period ?
> >or
> >Is is that lockd should enter grace period only
> when it restarts 
> >without caring for nfs.?
> 
> The lockd should enter grace period whenever nfsd
> starts/restarts.
> 
> ~Chetan
> 


__________________________________ 
Do you Yahoo!? 
Yahoo! Mail - now with 250MB free storage. Learn more.
http://info.mail.yahoo.com/mail_250


-------------------------------------------------------
This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting
Tool for open source databases. Create drag-&-drop reports. Save time
by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc.
Download a FREE copy at http://www.intelliview.com/go/osdn_nl
_______________________________________________
NFS maillist  -  NFS@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nfs