LISTSERV mailing list manager LISTSERV 16.5

Help for XROOTD-L Archives


XROOTD-L Archives

XROOTD-L Archives


XROOTD-L@LISTSERV.SLAC.STANFORD.EDU


View:

Message:

[

First

|

Previous

|

Next

|

Last

]

By Topic:

[

First

|

Previous

|

Next

|

Last

]

By Author:

[

First

|

Previous

|

Next

|

Last

]

Font:

Proportional Font

LISTSERV Archives

LISTSERV Archives

XROOTD-L Home

XROOTD-L Home

XROOTD-L  February 2005

XROOTD-L February 2005

Subject:

RE: olbd problems at RAL

From:

"Brew, CAJ \(Chris\)" <[log in to unmask]>

Date:

18 Feb 2005 17:51:04 -0000Fri, 18 Feb 2005 17:51:04 -0000

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (182 lines)

Hi,

Any suggestions of extra looging to switch on on the servers before I
head off.

I just had to restart the olbds on 6 out of 20 servers but I'm not going
to be around over the weekend to restart them.

Yours,
Chris.

> -----Original Message-----
> From: [log in to unmask] 
> [mailto:[log in to unmask]] On Behalf Of 
> Brew, CAJ (Chris)
> Sent: 18 February 2005 11:27
> To: Andrew Hanushevsky; Peter Elmer
> Cc: [log in to unmask]
> Subject: RE: olbd problems at RAL
> 
> Hi,
> 
> The logs for the last couple of days are in
> /afs/slac.stanford.edu/u/br/brew/olb_problem. There isn't much info
> there. If you suggest the extra traces to add I'll put them in the
> config files.
> 
> The rdr xrootd and olbd hasn't been restarted for a while so it'd
> startup isn't in the period covered by the logs.
> 
> The -t option on the xrootd is identical to the "ofs.redirect target
> hostname" in the xrootd.cf file, correct? We seem to be using that
> rather than -t on the command line. I'll add it now and see if it has
> any effect.
> 
> Before I left last night I set up a job that once an hour would try to
> access a file of each server every hour (the job failed in the early
> hours because my desktop got rebooted to install security patches) but
> you can see in the rdr xrd log that between 18:08 and 19:10 
> some servers
> stopped answering requests for the files. Strangely between 
> my test job
> stoping overnight and my test this morning the list of non responsive
> servers changed.
> 
> We do have a slightly mixed system at the moment and it's in flux.
> 
> All but one test server are running the xrootd-20040907-0403 version,
> one test server (csfnfs45) is running xrootd-20041214-1142 but the
> problem appears on both types.
> 
> We've just added the extra SL3 redirector xrootd107 in addition to our
> old RH73 one csflnx108 but the problem happens via both redirectors.
> 
> Most of the servers have an entry for an extra redirector xrootd108 in
> their config files (but not all the servers experiencing the problem)
> which is what csflnx108 will become when it's reinstalled with SL3 but
> the DNS name does not yet exist so there is some complaint to the
> olblogs about that.
> 
> Yours,
> Chris.
> 
> > -----Original Message-----
> > From: Andrew Hanushevsky [mailto:[log in to unmask]] 
> > Sent: 17 February 2005 15:22
> > To: Peter Elmer
> > Cc: Brew, CAJ (Chris); [log in to unmask]
> > Subject: Re: olbd problems at RAL
> > 
> > Hi Pete,
> > 
> > Sometimes minor things leak in that have major impacts. 
> > Usually I go by
> > what is really running successful elsewhere to determine the 
> > probability
> > of success. However, you do bring up a good point. Chris, 
> > please make sure
> > that you are using -w on the olbd consistently with -t on the 
> > xrootd data
> > server. If you specifu -w but not -t then you will see 
> > exactly what you
> > described. Also, the logs during start-up time to hang time would be
> > helpful (i.e., redirector: xrootd and olbd, and data server 
> > xrootd/olbd).
> > Please clearly identify which is which. Thanks.
> > 
> > Andy
> > 
> > On Thu, 17 Feb 2005, Peter Elmer wrote:
> > 
> > >   Hi Andy,
> > >
> > >   From:
> > >
> > >   http://xrootd.slac.stanford.edu/xrootd.History
> > >
> > > the only differences between version 20040907-0403 (the one 
> > we currently
> > > label "production") and 20040830-0105 are small changes to 
> > the ./configure
> > > and makefiles, but nothing of substance that would lead to 
> > problems with
> > > the olbd. I suspect that there is something else going on. 
> > (e.g. the famous
> > > wait/-w problems?)
> > >
> > >                                    Pete
> > >
> > > On Thu, Feb 17, 2005 at 07:12:08AM -0800, Andrew 
> Hanushevsky wrote:
> > > > Hi Chris,
> > > >
> > > > Those two particular releases seem to have had some 
> > problems. I assume
> > > > you are not mixing releases here (i.e., running either on 
> > all servers
> > > > causes you to see the problem).
> > > >
> > > > I do know that 20040830 is a stable release. We run that 
> > everywhere at
> > > > SLAC for analysis. I'd suggest going with that one until 
> > we test out
> > > > the latest release that should have fixed some other 
> > problem relating
> > > > to writing files.
> > > >
> > > > Andy
> > > >
> > > > On Thu, 17 Feb 2005, Brew, CAJ (Chris) wrote:
> > > >
> > > > > Hi,
> > > > >
> > > > > Since increasing the number of servers at RAL from 8 to 
> > 21 we seem to be
> > > > > seeing a new failure mode.
> > > > >
> > > > > All the processes seem to be running fine and you can 
> > read a file by
> > > > > going directly to the server that hold is but the 
> > server does not seem
> > > > > to respond via the olbd network so if you try to access 
> > a file via the
> > > > > load balancer you fail.
> > > > >
> > > > > Restarting the load balancer on the data server fixes 
> > the problem.
> > > > >
> > > > > There is nothing unusual in the logs at either end as 
> > far or anything
> > > > > missing either as I can tell.
> > > > >
> > > > > This is on data servers running RH73 and 
> xrootd-20040907-0403 or
> > > > > xrootd-20041214-1142.
> > > > >
> > > > > Has anyone else seen this? Is there a fix?
> > > > >
> > > > > Thanks,
> > > > > Chris.
> > > > >
> > >
> > >
> > >
> > > 
> > --------------------------------------------------------------
> > -----------
> > > Peter Elmer     E-mail: [log in to unmask]      Phone: +41 
> > (22) 767-4644
> > > Address: CERN Division PPE, Bat. 32 2C-14, CH-1211 Geneva 
> > 23, Switzerland
> > > 
> > --------------------------------------------------------------
> > -----------
> > >
> > 
> 
> 



Top of Message | Previous Page | Permalink

Advanced Options


Options

Log In

Log In

Get Password

Get Password


Search Archives

Search Archives


Subscribe or Unsubscribe

Subscribe or Unsubscribe


Archives

February 2024
January 2024
December 2023
November 2023
October 2023
September 2023
August 2023
July 2023
June 2023
May 2023
April 2023
March 2023
February 2023
January 2023
December 2022
October 2022
September 2022
August 2022
July 2022
June 2022
May 2022
April 2022
March 2022
February 2022
January 2022
December 2021
November 2021
October 2021
September 2021
August 2021
July 2021
June 2021
May 2021
April 2021
March 2021
February 2021
January 2021
December 2020
November 2020
October 2020
September 2020
August 2020
July 2020
June 2020
May 2020
April 2020
March 2020
February 2020
January 2020
December 2019
November 2019
October 2019
September 2019
August 2019
July 2019
June 2019
May 2019
April 2019
March 2019
February 2019
January 2019
December 2018
November 2018
October 2018
September 2018
August 2018
July 2018
June 2018
May 2018
April 2018
March 2018
February 2018
January 2018
December 2017
November 2017
October 2017
September 2017
August 2017
July 2017
June 2017
May 2017
April 2017
March 2017
February 2017
January 2017
December 2016
November 2016
October 2016
September 2016
August 2016
July 2016
May 2016
April 2016
March 2016
February 2016
January 2016
December 2015
November 2015
October 2015
September 2015
August 2015
July 2015
June 2015
May 2015
April 2015
March 2015
February 2015
January 2015
December 2014
November 2014
October 2014
September 2014
August 2014
July 2014
June 2014
May 2014
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
July 2009
June 2009
May 2009
April 2009
March 2009
January 2009
December 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007
May 2007
April 2007
March 2007
February 2007
January 2007
December 2006
November 2006
October 2006
September 2006
August 2006
July 2006
June 2006
May 2006
April 2006
March 2006
February 2006
January 2006
December 2005
November 2005
October 2005
September 2005
August 2005
July 2005
June 2005
May 2005
April 2005
March 2005
February 2005
January 2005
December 2004
November 2004
October 2004
September 2004
August 2004

ATOM RSS1 RSS2



LISTSERV.SLAC.STANFORD.EDU

Secured by F-Secure Anti-Virus CataList Email List Search Powered by the LISTSERV Email List Manager

Privacy Notice, Security Notice and Terms of Use