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XROOTD-L  May 2008

XROOTD-L May 2008

Subject:

Re: Xrootd problem in SP production (fwd)

From:

Fabrizio Furano <[log in to unmask]>

Date:

26 May 2008 14:15:29 +0200Mon, 26 May 2008 14:15:29 +0200

Content-Type:

text/plain

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text/plain (822 lines)

Hi Armando,

>>
> Looking at xrdlog and netstat output I can roughly see ~10 requests
> (login and disc) per second

  that means that you have an average of 10 file opens per second per
server. Others may comment about that. It's not that high by itself, but
it depends on what the clients do after that.

> no suspicious messages about reset, just two of:
> 080526 13:49:11 3356 XrdProtocol: ?:1789@node132 terminated handshake
> not received

  this typically means that client and server were not able to handshake
in the very first 3-4 seconds of that connection's life. It can be a
sign of overload of something.

>
> and one of:
> 080526 13:56:16 3356 XrdPoll: Disabled event occured for
> babarsgm.11367:5301@node149

  Andy?


>
> The xrootd release:
>
> [root@babarxrd ~]# rpm -qa | grep xro
> xrootd-20071101-0808p1.slac
> [root@babarxrd ~]#
>

  A newer src tarball is in the Savannah website. But you have to
rebuild it if you want the rpm.

  Fabrizio


>
>
> Thanks to every body, in a day I'll submit new job runs with timeout
> setting at 600 and I'll post the xrdlog behaviour.
> In the meanwhile the scenario is still critical.
>
> Cheers, Armando
>
>> Good luck!
>> Fabrizio
>>
>>
>>
>>
>>
>>> Date: Sat, 24 May 2008 20:03:53 +0200
>>> From: Armando Fella <[log in to unmask]>
>>> To: Wilko Kroeger <[log in to unmask]>
>>> Cc: Andrew Hanushevsky <[log in to unmask]>
>>> Subject: Re: Xrootd problem in SP production
>>>
>>> Hi,
>>>
>>> the following is part af strace of a SP job asking file to xrootd, it
>>> hangs in polling. Hope this info cuold help in debugging the problem:
>>>
>>>
>>> connect(14, {sa_family=AF_INET, sin_port=htons(1094),
>>> sin_addr=inet_addr("212.189.152.199")}, 16) = -1 EINPROGRESS (Operation
>>> now in progress)
>>> poll([{fd=14, events=POLLOUT|POLLWRNORM, revents=POLLOUT|POLLWRNORM}],
>>> 1, 60000) = 1
>>> getsockopt(14, SOL_SOCKET, SO_ERROR, [17179869184], [4]) = 0
>>> fcntl64(14, F_SETFD, 0x2 /* FD_??? */) = 0
>>> time(NULL) = 1210667903
>>> time(NULL) = 1210667903
>>> poll([{fd=14, events=POLLOUT|POLLERR|POLLHUP|POLLNVAL,
>>> revents=POLLOUT}], 1, 1000) = 1
>>> send(14, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\4\0\0\7\334", 20, 0) = 20
>>> time(NULL) = 1210667903
>>> time(NULL) = 1210667903
>>> poll([{fd=14, events=POLLIN}], 1, 1000) = 0
>>> poll([{fd=14, events=POLLIN}], 1, 1000) = 0
>>> poll([{fd=14, events=POLLIN}], 1, 1000) = 0
>>> poll([{fd=14, events=POLLIN}], 1, 1000) = 0
>>> poll([{fd=14, events=POLLIN}], 1, 1000) = 0
>>> poll([{fd=14, events=POLLIN}], 1, 1000) = 0
>>> poll([{fd=14, events=POLLIN}], 1, 1000) = 0
>>> poll([{fd=14, events=POLLIN}], 1, 1000) = 0
>>> poll([{fd=14, events=POLLIN}], 1, 1000) = 0
>>> poll([{fd=14, events=POLLIN}], 1, 1000) = 0
>>> poll([{fd=14, events=POLLIN}], 1, 1000) = 0
>>> poll([{fd=14, events=POLLIN}], 1, 1000) = 0
>>> poll([{fd=14, events=POLLIN}], 1, 1000) =
>>> ...
>>> ...
>>>
>>> A fresh today xrdlog piece:
>>>
>>> 080524 19:29:49 30669 XrootdXeq: babarsgm.30980:780@theown2 disc
>>> 0:00:04 (ended by babarsgm.30980:756@theown2)
>>> 080524 19:29:50 30669 XrootdXeq: babarsgm.30615:780@theown5 login
>>> 080524 19:29:50 30669 XrootdXeq: babarsgm.30615:737@theown5 disc
>>> 0:00:05 (ended by babarsgm.30615:780@theown5)
>>> 080524 19:29:52 30669 XrootdXeq: babarsgm.22625:737@theown16 login
>>> 080524 19:29:52 30669 XrootdXeq: babarsgm.22625:741@theown16 disc
>>> 0:00:05 (ended by babarsgm.22625:737@theown16)
>>> 080524 19:29:55 30669 XrootdXeq: babarsgm.10828:741@node54 login
>>> 080524 19:29:55 30669 XrootdXeq: babarsgm.10828:718@node54 disc
>>> 0:00:50 (ended by babarsgm.10828:741@node54)
>>> 080524 19:29:56 30669 XrootdXeq: babarsgm.32501:718@node8 login
>>> 080524 19:29:56 30669 XrootdXeq: babarsgm.32501:109@node8 disc
>>> 0:00:32 (ended by babarsgm.32501:718@node8)
>>> 080524 19:29:58 30669 XrootdXeq: babarsgm.10828:109@node54 login
>>> 080524 19:29:59 30669 XrootdXeq: babarsgm.32501:781@node8 login
>>> 080524 19:29:59 30669 XrootdXeq: babarsgm.32501:718@node8 disc
>>> 0:00:03 (ended by babarsgm.32501:781@node8)
>>>
>>>
>>>
>>> Cheers, Armando
>>>
>>>
>>> Armando Fella ha scritto:
>>>> Hi,
>>>>
>>>> I'm using the xrootd client enbedded in MooseApp SP 24.2.1l
>>>> executable. The following is the KanAccess.conf:
>>>>
>>>> rootenv Root.XTNetFileAllowWanConnect 1
>>>> rootenv Root.XTNetFileAllowWanRedirect 1
>>>> rootenv XNet.RedirDomainAllowRE *.infn.it
>>>> rootenv XNet.ConnectDomainAllowRE *.infn.it
>>>> rootenv XNet.RequestTimeout 180
>>>>
>>>> read /store/cdb/* xrootd $XROOTD_HOST:1094/
>>>> write /store/cdb/* error
>>>>
>>>> read /store/cfg/* xrootd $XROOTD_HOST:1094/
>>>> write /store/cfg/* error
>>>>
>>>> read /store/* xrootd $XROOTD_HOST:1094/
>>>>
>>>> I'm using root version 5.14-00e (but I'm not sure it is the babar
>>>> one, I should check)
>>>> The 20 sec is just a case, the login-disc inter time is between 2
>>>> min and 3 sec.
>>>>
>>>> I tried to use directly the xrd in /opt/xrootd/bin/ on server and on
>>>> a client wn and it seems to work fine, it transfer the file straight
>>>> on.
>>>>
>>>> I have 2 xrootd servers with this problem and the user bbrmgr (the
>>>> xrootd launcher) owns the .rootrc file on first server but on the
>>>> second the file is absent
>>>>
>>>> [bbr-serv08] ~ > cat .rootrc
>>>> Root.XTNetFileAllowWanConnect: 1
>>>> Root.XTNetFileAllowWanRedirect:1
>>>> [bbr-serv08] ~ > XrootD version:
>>>>
>>>> [bbrmgr@babarxrd ~]$ rpm -qa | grep xroo
>>>> xrootd-20071101-0808p1.slac
>>>> [bbrmgr@babarxrd ~]$ The system.rootrc is in attachment.
>>>>
>>>> The problem is still there and the fail rate is 95% when we reach
>>>> the limit of 70 jobs asking for cdb cfg bkg on the same xrootd server.
>>>>
>>>> Please try to find the bug, we are quite stopped by this problem
>>>> Please ask if you need more info.
>>>>
>>>> We did the following actions:
>>>>
>>>> reinstall xrootd
>>>> reboot the machines
>>>> modifiy the KanAccess.cfg
>>>> modify the /etc/sysctl.conf
>>>>
>>>>
>>>> Thanks, Armando
>>>>
>>>> Wilko Kroeger ha scritto:
>>>>>
>>>>> Hello Armando
>>>>>
>>>>> I cc'ed Andy.
>>>>>
>>>>> It is not clear what is going wrong. It looks like that it might be
>>>>> related to the client.
>>>>> Below are more comments.
>>>>>
>>>>>
>>>>> On Thu, 22 May 2008, Armando Fella wrote:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I'd add same information:
>>>>>>
>>>>>> 1) I try to change the tcp rmem wmem in /etc/sysctl.conf adding
>>>>>> the lines:
>>>>>>
>>>>>> [root@babarxrd ~]# sysctl -p
>>>>>> net.ipv4.ip_forward = 0
>>>>>> net.ipv4.conf.default.rp_filter = 1
>>>>>> net.ipv4.conf.default.accept_source_route = 0
>>>>>> kernel.sysrq = 0
>>>>>> kernel.core_uses_pid = 1
>>>>>> net.core.rmem_max = 16777216
>>>>>> net.core.wmem_max = 16777216
>>>>>> net.ipv4.tcp_rmem = 4096 87380 16777216
>>>>>> net.ipv4.tcp_wmem = 4096 65536 16777216
>>>>>> net.core.netdev_max_backlog = 250000
>>>>>> [root@babarxrd ~]#
>>>>>
>>>>> I don't have any experience with tuning the network parameter for
>>>>> linux so I can't comment on the changes. At slac we use xrootd very
>>>>> little on linux but the machine we are using it (ER processing,
>>>>> with ~500 clients) we didn't have to do any tuning).
>>>>>
>>>>>> but restarting xrootd the wrong behaviour is still present:
>>>>>>
>>>>>> 080522 16:31:01 30669 XrootdXeq: babarsgm.4308:17@theown15 login
>>>>>> 080522 16:31:01 30669 XrootdXeq: babarsgm.4308:15@theown15 disc
>>>>>> 0:00:20 (ended by babarsgm.4308:17@theown15)
>>>>>> 080522 16:31:03 30669 XrootdXeq: babarsgm.9392:15@node75 login
>>>>>> 080522 16:31:03 30669 XrootdXeq: babarsgm.9392:16@node75 disc
>>>>>> 0:00:20 (ended by babarsgm.9392:15@node75)
>>>>>> 080522 16:31:04 30669 XrootdXeq: babarsgm.24721:16@node119 login
>>>>>> 080522 16:31:04 30669 XrootdXeq: babarsgm.24721:18@node119 disc
>>>>>> 0:00:20 (ended by babarsgm.24721:16@node119)
>>>>>> 080522 16:31:17 30669 XrootdXeq: babarsgm.5109:18@gridwn99 login
>>>>>> 080522 16:31:17 30669 XrootdXeq: babarsgm.5109:19@gridwn99 disc
>>>>>> 0:00:20 (ended by babarsgm.5109:18@gridwn99)
>>>>>> 080522 16:31:21 30669 XrootdXeq: babarsgm.4308:19@theown15 login
>>>>>> 080522 16:31:21 30669 XrootdXeq: babarsgm.4308:17@theown15 disc
>>>>>> 0:00:20 (ended by babarsgm.4308:19@theown15)
>>>>>> 080522 16:31:23 30669 XrootdXeq: babarsgm.9392:17@node75 login
>>>>>> 080522 16:31:23 30669 XrootdXeq: babarsgm.9392:15@node75 disc
>>>>>> 0:00:20 (ended by babarsgm.9392:17@node75)
>>>>>> 080522 16:31:24 30669 XrootdXeq: babarsgm.24721:15@node119 login
>>>>>> 080522 16:31:24 30669 XrootdXeq: babarsgm.24721:16@node119 disc
>>>>>> 0:00:20 (ended by babarsgm.24721:15@node119)
>>>>>
>>>>> It is very suspicious that all the disconnects are after 20 sec. Is
>>>>> this happening for all SP jobs or only for some of them?
>>>>>
>>>>> You could try to copy a file from xrootd with xrdcp and check if
>>>>> that works fine or if you see a similar behavior.
>>>>>
>>>>> Do you know if anything changed on the client site, different root
>>>>> version, change of timeouts in ~/.rootrc or
>>>>> $ROOTSYS/root/etc/rootd/system.rootrc
>>>>>
>>>>> I guess you are using the babar root version 5.14-00e. Which xrootd
>>>>> version are you using?
>>>>>
>>>>> Sorry that I don't have a more definite answer.
>>>>>
>>>>> Cheers,
>>>>> Wilko
>>>>>
>>>>>>
>>>>>> Cheers, Armando
>>>>>>
>>>>>>
>>>>>>
>>>>>> Wilko Kroeger ha scritto:
>>>>>>>
>>>>>>> Hello Armando
>>>>>>>
>>>>>>> Sorry for the late reply. I didn't manage to talk to Andy about
>>>>>>> it but I will try on Wednesday.
>>>>>>> I think all your config files and Start scripts look fine. One
>>>>>>> thing you could do is to remove the
>>>>>>> all.role server
>>>>>>> option. By default xrootd starts up as a server and if this
>>>>>>> directive is omitted the xrootd will not try to connect to an
>>>>>>> olbd (
>>>>>>> 080516 13:17:43 24822 odc_Open: Unable to connect socket to
>>>>>>> /tmp/.olb/olbd.admin; connection refused)
>>>>>>>
>>>>>>> To make sure that your xrootd got started properly you can just
>>>>>>> do "ps -ef | grep xrootd" and you should only see the -l
>>>>>>> <logfile> and -c <xrootd.cf> options being used.
>>>>>>>
>>>>>>> What I don't understand is from your xrdlog file:
>>>>>>>
>>>>>>> 080513 14:36:00 13753 XrootdXeq: babarsgm.15816:3890@gridwn75 login
>>>>>>> 080513 14:36:00 13753 XrootdXeq: babarsgm.15816:4155@gridwn75 disc
>>>>>>> 0:00:40 (ended by babarsgm.15816:3890@gridwn75)
>>>>>>> 080513 14:36:03 13753 XrootdXeq: babarsgm.15816:4155@gridwn75 login
>>>>>>> 080513 14:36:03 13753 XrootdXeq: babarsgm.15816:3890@gridwn75 disc
>>>>>>> 0:00:03 (ended by babarsgm.15816:4155@gridwn75)
>>>>>>>
>>>>>>> The client babarsgm.15816 was connected but some timeout happened
>>>>>>> that caused the client to reconnect at 14:36:00 causing its
>>>>>>> previous session
>>>>>>> (babarsgm.15816:4155) to be closed. The strange thing now is that
>>>>>>> after three seconds at 14:36:03 the client reconnects again which
>>>>>>> causes the previous session (from 14:36:00) to be closed. Three
>>>>>>> seconds is very short and I don't think that the client or server
>>>>>>> has any timeout this short.
>>>>>>> Therefore I also think that
>>>>>>> rootenv XNet.RequestTimeout 180
>>>>>>> would not help.
>>>>>>>
>>>>>>> I will talk with Andy maybe he has an idea.
>>>>>>>
>>>>>>> Cheers,
>>>>>>> Wilko
>>>>>>>
>>>>>>>
>>>>>>> On Tue, 20 May 2008, Armando Fella wrote:
>>>>>>>
>>>>>>>> Reminder
>>>>>>>>
>>>>>>>> Armando Fella ha scritto:
>>>>>>>>> Here you can find the files I referred in the email:
>>>>>>>>>
>>>>>>>>> http://www.cnaf.infn.it/~afella/StartXRD.cf
>>>>>>>>> http://www.cnaf.infn.it/~afella/StartXRD
>>>>>>>>>
>>>>>>>>> Cheers, Armando
>>>>>>>>>
>>>>>>>>> Armando Fella ha scritto:
>>>>>>>>>> *** Discussion title: Simulation Production
>>>>>>>>>> Email replies to [log in to unmask] must include:
>>>>>>>>>> In-Reply-To: <[log in to unmask]>
>>>>>>>>>> Subject: ...change this to be about your reply.
>>>>>>>>>>
>>>>>>>>>> This is a multi-part message in MIME format.
>>>>>>>>>> --------------010909020508030509010608
>>>>>>>>>> Content-Type: text/plain; charset=ISO-8859-15; format=flowed
>>>>>>>>>> Content-Transfer-Encoding: 7bit
>>>>>>>>>>
>>>>>>>>>> Hi Wilko,
>>>>>>>>>>
>>>>>>>>>> the machine has not been reinstalled or kernel upgraded, the
>>>>>>>>>> following are the info about OS and architecture:
>>>>>>>>>>
>>>>>>>>>> [root@babarxrd ~]# uname -a
>>>>>>>>>> Linux babarxrd.pi.infn.it 2.6.9-55.EL #1 Thu May 3 23:04:51
>>>>>>>>>> CDT 2007 i686 athlon i386 GNU/Linux
>>>>>>>>>> [root@babarxrd ~]# cat /etc/redhat-release
>>>>>>>>>> Scientific Linux SL release 4.5 (Beryllium)
>>>>>>>>>> [root@babarxrd ~]#
>>>>>>>>>> [root@babarxrd ~]# rpm -qa --queryformat
>>>>>>>>>> '[("%{NAME}","%{VERSION}-%{RELEASE}","%{ARCH}")\n]' | grep xroo
>>>>>>>>>> ("xrootd","20071101-0808p1.slac","i386")
>>>>>>>>>> [root@babarxrd ~]#
>>>>>>>>>>
>>>>>>>>>> I suspect that the problem could be in correctness of
>>>>>>>>>> StartXRD.cf and StartXRD that I got from the xrootd tgz
>>>>>>>>>> package (can you check that in attachment?), I installed the
>>>>>>>>>> rpm and I got the two files from the tgz.
>>>>>>>>>>
>>>>>>>>>> Is it possible to increase the client timeout to permit the
>>>>>>>>>> possible network bottleneck to be avoided?
>>>>>>>>>> The KanAccess.cfg instruction to add is:
>>>>>>>>>>
>>>>>>>>>> rootenv XNet.RequestTimeout 180
>>>>>>>>>>
>>>>>>>>>> is 180 the right value?
>>>>>>>>>>
>>>>>>>>>> Now I'm not able to increase the site job load so the xrdlog
>>>>>>>>>> and pstack probably are not so meaningfull, in any case that
>>>>>>>>>> follow :
>>>>>>>>>>
>>>>>>>>>> [root@babarxrd ~]# pidof xrootd
>>>>>>>>>> 24822
>>>>>>>>>> [root@babarxrd ~]# pstack 24822
>>>>>>>>>> Thread 16 (Thread -1208767584 (LWP 24823)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00b8feac in pthread_cond_timedwait@@GLIBC_2.3.2 ()
>>>>>>>>>> #2 0x08095948 in XrdSysCondVar::Wait ()
>>>>>>>>>> #3 0x0807b04a in XrdBuffManager::Reshape ()
>>>>>>>>>> #4 0x0807a8c0 in XrdReshaper ()
>>>>>>>>>> #5 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #6 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #7 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 15 (Thread -1209558112 (LWP 24824)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00b8feac in pthread_cond_timedwait@@GLIBC_2.3.2 ()
>>>>>>>>>> #2 0x08095948 in XrdSysCondVar::Wait ()
>>>>>>>>>> #3 0x0808477f in XrdScheduler::TimeSched ()
>>>>>>>>>> #4 0x0808303e in XrdStartTSched ()
>>>>>>>>>> #5 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #6 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #7 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 14 (Thread -1210348640 (LWP 24825)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00b91b4f in [log in to unmask] () from
>>>>>>>>>> /lib/tls/libpthread.so.0
>>>>>>>>>> #2 0x08079b60 in XrdSysSemaphore::Wait ()
>>>>>>>>>> #3 0x08083d1a in XrdScheduler::Run ()
>>>>>>>>>> #4 0x08083070 in XrdStartWorking ()
>>>>>>>>>> #5 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #6 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #7 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 13 (Thread -1211139168 (LWP 24826)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00b91b4f in [log in to unmask] () from
>>>>>>>>>> /lib/tls/libpthread.so.0
>>>>>>>>>> #2 0x08079b60 in XrdSysSemaphore::Wait ()
>>>>>>>>>> #3 0x08083d1a in XrdScheduler::Run ()
>>>>>>>>>> #4 0x08083070 in XrdStartWorking ()
>>>>>>>>>> #5 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #6 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #7 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 12 (Thread -1212376160 (LWP 24827)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00895e04 in poll () from /lib/tls/libc.so.6
>>>>>>>>>> #2 0x0808130e in XrdPollPoll::Start ()
>>>>>>>>>> #3 0x0807fb6c in XrdStartPolling ()
>>>>>>>>>> #4 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #5 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #6 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 11 (Thread -1213346912 (LWP 24828)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00895e04 in poll () from /lib/tls/libc.so.6
>>>>>>>>>> #2 0x0808130e in XrdPollPoll::Start ()
>>>>>>>>>> #3 0x0807fb6c in XrdStartPolling ()
>>>>>>>>>> #4 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #5 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #6 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 10 (Thread -1214317664 (LWP 24829)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00895e04 in poll () from /lib/tls/libc.so.6
>>>>>>>>>> #2 0x0808130e in XrdPollPoll::Start ()
>>>>>>>>>> #3 0x0807fb6c in XrdStartPolling ()
>>>>>>>>>> #4 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #5 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #6 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 9 (Thread -1215108192 (LWP 24830)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00b92db6 in __nanosleep_nocancel () from
>>>>>>>>>> /lib/tls/libpthread.so.0
>>>>>>>>>> #2 0x080963a8 in XrdSysTimer::Wait ()
>>>>>>>>>> #3 0x00210c7d in XrdOdcFinderTRG::Hookup () from
>>>>>>>>>> /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>> #4 0x00210a7c in XrdOdcFinderTRG::Start () from
>>>>>>>>>> /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>> #5 0x00210846 in XrdOdcStartOlb () from
>>>>>>>>>> /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>> #6 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #7 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #8 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 8 (Thread -1215898720 (LWP 24831)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00b925cb in __read_nocancel () from
>>>>>>>>>> /lib/tls/libpthread.so.0
>>>>>>>>>> #2 0x08093259 in XrdOucStream::GetLine ()
>>>>>>>>>> #3 0x001f1d85 in XrdOfsEvr::recvEvents () from
>>>>>>>>>> /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>> #4 0x001f16d8 in XrdOfsEvRecv () from
>>>>>>>>>> /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>> #5 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #6 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #7 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 7 (Thread -1216689248 (LWP 24832)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00b91b4f in [log in to unmask] () from
>>>>>>>>>> /lib/tls/libpthread.so.0
>>>>>>>>>> #2 0x08079b60 in XrdSysSemaphore::Wait ()
>>>>>>>>>> #3 0x001f1ac3 in XrdOfsEvr::flushEvents () from
>>>>>>>>>> /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>> #4 0x001f170a in XrdOfsEvFlush () from
>>>>>>>>>> /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>> #5 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #6 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #7 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 6 (Thread -1217479776 (LWP 24833)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x007ffb30 in do_sigwaitinfo () from /lib/tls/libc.so.6
>>>>>>>>>> #2 0x007ffc0f in sigwaitinfo () from /lib/tls/libc.so.6
>>>>>>>>>> #3 0x0020c8f2 in XrdOssAioWait () from
>>>>>>>>>> /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>> #4 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #5 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #6 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 5 (Thread -1218270304 (LWP 24834)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x007ffb30 in do_sigwaitinfo () from /lib/tls/libc.so.6
>>>>>>>>>> #2 0x007ffc0f in sigwaitinfo () from /lib/tls/libc.so.6
>>>>>>>>>> #3 0x0020c8f2 in XrdOssAioWait () from
>>>>>>>>>> /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>> #4 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #5 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #6 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 4 (Thread -1219060832 (LWP 24835)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00b92db6 in __nanosleep_nocancel () from
>>>>>>>>>> /lib/tls/libpthread.so.0
>>>>>>>>>> #2 0x0020dcbe in XrdOssSys::CacheScan () from
>>>>>>>>>> /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>> #3 0x001ff4ec in XrdOssCacheScan () from
>>>>>>>>>> /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>> #4 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #5 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #6 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 3 (Thread -1219851360 (LWP 24836)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00b92db6 in __nanosleep_nocancel () from
>>>>>>>>>> /lib/tls/libpthread.so.0
>>>>>>>>>> #2 0x001eba6f in XrdOfsIdleScan () from
>>>>>>>>>> /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>> #3 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #4 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #5 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 2 (Thread -1220641888 (LWP 24837)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00b927d8 in accept () from /lib/tls/libpthread.so.0
>>>>>>>>>> #2 0x0808d002 in XrdNetSocket::Accept ()
>>>>>>>>>> #3 0x0805c833 in XrdXrootdAdmin::Start ()
>>>>>>>>>> #4 0x0805c4bb in XrdXrootdInitAdmin ()
>>>>>>>>>> #5 0x08095856 in XrdSysThread_Xeq ()
>>>>>>>>>> #6 0x00b8d3cc in start_thread () from /lib/tls/libpthread.so.0
>>>>>>>>>> #7 0x0089fc3e in clone () from /lib/tls/libc.so.6
>>>>>>>>>> Thread 1 (Thread -1208764736 (LWP 24822)):
>>>>>>>>>> #0 0x007bd7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
>>>>>>>>>> #1 0x00b927d8 in accept () from /lib/tls/libpthread.so.0
>>>>>>>>>> #2 0x0808a1fe in XrdNet::do_Accept_TCP ()
>>>>>>>>>> #3 0x080899de in XrdNet::Accept ()
>>>>>>>>>> #4 0x080893c8 in XrdInet::Accept ()
>>>>>>>>>> #5 0x0807f359 in mainAccept ()
>>>>>>>>>> #6 0x0807f6d1 in main ()
>>>>>>>>>> [root@babarxrd ~]# The xrdlog contains the start daemon
>>>>>>>>>> messages, no jobs are running now:
>>>>>>>>>>
>>>>>>>>>> 080516 13:16:33 001 Scalla is starting. . .
>>>>>>>>>> Copr. 2007 Stanford University, xrd version 20071101-0808p1_dbg
>>>>>>>>>> Config using configuration file /opt/xrootd/etc/xrootd.cf
>>>>>>>>>> ++++++ xrootd [log in to unmask] initialization started.
>>>>>>>>>> Config maximum number of connections restricted to 65535
>>>>>>>>>> Copr. 2007 Stanford University, xrootd version 2.9.0 build
>>>>>>>>>> 20071101-0808p1
>>>>>>>>>> ++++++ xrootd protocol initialization started.
>>>>>>>>>> =====> xrootd.fslib /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>> =====> xrootd.export /store
>>>>>>>>>> Config warning: 'xrootd.seclib' not specified; strong
>>>>>>>>>> authentication disabled!
>>>>>>>>>> Copr. 2007 Stanford University, Ofs Version 20071101-0808p1_dbg
>>>>>>>>>> ++++++ File system initialization started.
>>>>>>>>>> =====> all.role server
>>>>>>>>>> ++++++ Configuring server role. . .
>>>>>>>>>> Config effective /opt/xrootd/etc/xrootd.cf ofs configuration:
>>>>>>>>>> ofs.role server
>>>>>>>>>> ofs.fdscan 9 120 1200
>>>>>>>>>> ofs.maxdelay 60
>>>>>>>>>> ofs.trace 0
>>>>>>>>>> ------ File system server initialization completed.
>>>>>>>>>> Copr. 2007, Stanford University, oss Version 20071101-0808p1_dbg
>>>>>>>>>> ++++++ Storage system initialization started.
>>>>>>>>>> =====> oss.localroot /data
>>>>>>>>>> =====> oss.path /store r/o
>>>>>>>>>> 080516 13:16:33 24822 odc_Open: Unable to connect socket to
>>>>>>>>>> /tmp/.olb/olbd.admin; connection refused
>>>>>>>>>> Config effective /opt/xrootd/etc/xrootd.cf oss configuration:
>>>>>>>>>> oss.alloc 0 0 0
>>>>>>>>>> oss.cachescan 600
>>>>>>>>>> oss.compdetect *
>>>>>>>>>> oss.fdlimit 32767 65535
>>>>>>>>>> oss.maxdbsize 0
>>>>>>>>>> oss.localroot /data
>>>>>>>>>> oss.trace 0
>>>>>>>>>> oss.xfr 1 9437184 30 10800
>>>>>>>>>> oss.memfile off max 1062334464
>>>>>>>>>> oss.defaults r/w nocheck nodread nomig norcreate nostage
>>>>>>>>>> oss.path /store r/o nocheck nodread nomig norcreate
>>>>>>>>>> nostage
>>>>>>>>>> ------ Storage system initialization completed.
>>>>>>>>>> Config warning: 'xrootd.prepare logdir' not specified; prepare
>>>>>>>>>> tracking disabled.
>>>>>>>>>> Config exporting /store
>>>>>>>>>> ------ xrootd protocol initialization completed.
>>>>>>>>>> ------ xrootd [log in to unmask]:1094 initialization
>>>>>>>>>> completed.
>>>>>>>>>> 080516 13:17:43 24822 odc_Open: Unable to connect socket to
>>>>>>>>>> /tmp/.olb/olbd.admin; connection refused
>>>>>>>>>> 080516 13:18:53 24822 odc_Open: Unable to connect socket to
>>>>>>>>>> /tmp/.olb/olbd.admin; connection refused
>>>>>>>>>> ....
>>>>>>>>>> ....
>>>>>>>>>> ....
>>>>>>>>>>
>>>>>>>>>> Thank you for all the help
>>>>>>>>>>
>>>>>>>>>> Cheers, Armando
>>>>>>>>>>
>>>>>>>>>> Wilko Kroeger ha scritto:
>>>>>>>>>>
>>>>>>>>>>> *** Discussion title: Simulation Production
>>>>>>>>>>> Email replies to [log in to unmask] must include:
>>>>>>>>>>> In-Reply-To:
>>>>>>>>>>> <[log in to unmask]>
>>>>>>>>>>> Subject: ...change this to be about your reply.
>>>>>>>>>>>
>>>>>>>>>>> Hello Armando
>>>>>>>>>>>
>>>>>>>>>>> The config certainly looks fine and also the load that you
>>>>>>>>>>> describe should not cause problems. It is a little bit
>>>>>>>>>>> strange that you suddenly see this problem. Do you know if
>>>>>>>>>>> anything happened to the machine itself
>>>>>>>>>>> (update kernel,..)?
>>>>>>>>>>>
>>>>>>>>>>> The disconnect messages you see are due to timeouts. The
>>>>>>>>>>> client does not receive the response from the server within a
>>>>>>>>>>> certain timeout and therefore it will reconnect to the server
>>>>>>>>>>> and close (disconnect) its previous session.
>>>>>>>>>>>
>>>>>>>>>>> If you still have the problem you could take a pstack
>>>>>>>>>>> pstack <xrootd_pid> > outfile
>>>>>>>>>>> and send it (or put some where at slac) me and Andy pstack
>>>>>>>>>>> output and maybe also the xrdlog file.
>>>>>>>>>>> I assume the server is a linux machine.
>>>>>>>>>>>
>>>>>>>>>>> Cheers,
>>>>>>>>>>> Wilko
>>>>>>>>>>>
>>>>>>>>>>> On Thu, 15 May 2008, Armando Fella wrote:
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>> Hi,
>>>>>>>>>>>>
>>>>>>>>>>>> we are experiencing unexpected problems on xrootd system
>>>>>>>>>>>> dedicated to cdb cfg and bkg access in SP production
>>>>>>>>>>>> (24.2.1l). Three days ago the xrootd server (no oldb) of the
>>>>>>>>>>>> unique machine serving around 100 SP jobs switched off and
>>>>>>>>>>>> since its restart the fail rate was around 95%. The server
>>>>>>>>>>>> worked properly for 6 months with peak 200 jobs asking files.
>>>>>>>>>>>>
>>>>>>>>>>>> I checked the parameters in xrootd.cf, but they are in the
>>>>>>>>>>>> standards:
>>>>>>>>>>>>
>>>>>>>>>>>> [root@babarxrd ~]# cat /opt/xrootd/etc/xrootd.cf
>>>>>>>>>>>> xrootd.fslib /opt/xrootd/lib/libXrdOfs.so
>>>>>>>>>>>> xrootd.export /store
>>>>>>>>>>>>
>>>>>>>>>>>> oss.localroot /data
>>>>>>>>>>>> oss.path /store r/o
>>>>>>>>>>>>
>>>>>>>>>>>> all.role server
>>>>>>>>>>>>
>>>>>>>>>>>> [root@babarxrd ~]# The xrdlog shows continuously login and
>>>>>>>>>>>> disconnecting connection:
>>>>>>>>>>>>
>>>>>>>>>>>> [root@babarxrd ~]# tail xrdlog
>>>>>>>>>>>> 080513 14:36:00 13753 XrootdXeq: babarsgm.3924:4170@gridwn24
>>>>>>>>>>>> login
>>>>>>>>>>>> 080513 14:36:00 13753 XrootdXeq: babarsgm.3924:3890@gridwn24
>>>>>>>>>>>> disc 0:01:49 (ended by babarsgm.3924:4170@gridwn24)
>>>>>>>>>>>> 080513 14:36:00 13753 XrootdXeq:
>>>>>>>>>>>> babarsgm.15816:3890@gridwn75 login
>>>>>>>>>>>> 080513 14:36:00 13753 XrootdXeq:
>>>>>>>>>>>> babarsgm.15816:4155@gridwn75 disc 0:00:40 (ended by
>>>>>>>>>>>> babarsgm.15816:3890@gridwn75)
>>>>>>>>>>>> 080513 14:36:03 13753 XrootdXeq:
>>>>>>>>>>>> babarsgm.15816:4155@gridwn75 login
>>>>>>>>>>>> 080513 14:36:03 13753 XrootdXeq:
>>>>>>>>>>>> babarsgm.15816:3890@gridwn75 disc 0:00:03 (ended by
>>>>>>>>>>>> babarsgm.15816:4155@gridwn75)
>>>>>>>>>>>> 080513 14:36:03 13753 XrootdXeq:
>>>>>>>>>>>> babarsgm.15208:3890@gridwn65 login
>>>>>>>>>>>> 080513 14:36:03 13753 XrootdXeq:
>>>>>>>>>>>> babarsgm.15208:4141@gridwn65 disc 0:00:36 (ended by
>>>>>>>>>>>> babarsgm.15208:3890@gridwn65)
>>>>>>>>>>>> 080513 14:36:03 13753 XrootdXeq: babarsgm.3924:4141@gridwn24
>>>>>>>>>>>> login
>>>>>>>>>>>> 080513 14:36:03 13753 XrootdXeq: babarsgm.3924:4170@gridwn24
>>>>>>>>>>>> disc 0:00:03 (ended by babarsgm.3924:4141@gridwn24)
>>>>>>>>>>>> [root@babarxrd ~]#
>>>>>>>>>>>> The xrootd version is:
>>>>>>>>>>>>
>>>>>>>>>>>> [root@babarxrd ~]# rpm -qa | grep xroot
>>>>>>>>>>>> xrootd-20071101-0808p1.slac
>>>>>>>>>>>> [root@babarxrd ~]#
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> Other symptoms are the quick raising of connection (70 jobs):
>>>>>>>>>>>>
>>>>>>>>>>>> [root@babarxrd ~]# netstat -natup | grep xroot |wc
>>>>>>>>>>>> 3715 26005 404935
>>>>>>>>>>>> [root@babarxrd ~]# lsof -i | grep xroot |grep
>>>>>>>>>>>> gridwn131.pi.infn.it|wc
>>>>>>>>>>>> 104 936 12480
>>>>>>>>>>>> [root@babarxrd ~]# lsof -i | grep xroot |grep
>>>>>>>>>>>> gridwn84.pi.infn.it|wc
>>>>>>>>>>>> 205 1845 24395
>>>>>>>>>>>> [root@babarxrd ~]# lsof -i | grep xroot |grep
>>>>>>>>>>>> gridwn76.pi.infn.it|wc
>>>>>>>>>>>> 115 1035 13685
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> dstat output (not so much throughput):
>>>>>>>>>>>>
>>>>>>>>>>>> [root@babarxrd ~]# ./dstat
>>>>>>>>>>>> ----total-cpu-usage---- -dsk/total- -net/total- ---paging--
>>>>>>>>>>>> ---system--
>>>>>>>>>>>> usr sys idl wai hiq siq| read writ| recv send| in out |
>>>>>>>>>>>> int csw
>>>>>>>>>>>> 40 1 58 2 0 0| 25k 27k| 0 0 | 0
>>>>>>>>>>>> 3.7B|1699 265
>>>>>>>>>>>> 0 4 96 0 0 0| 0 64k| 31k 520k| 0 0
>>>>>>>>>>>> |1937 391
>>>>>>>>>>>> 0 5 95 0 0 0| 0 16k| 38k 619k| 0 0
>>>>>>>>>>>> |2109 480
>>>>>>>>>>>> 0 4 96 0 0 0| 16k 0 | 34k 638k| 0 0
>>>>>>>>>>>> |2045 349
>>>>>>>>>>>> 0 3 96 1 0 0| 24k 120k| 36k 592k| 0 0
>>>>>>>>>>>> |2068 419
>>>>>>>>>>>> 1 3 96 0 0 0| 0 248k| 36k 547k| 0 0
>>>>>>>>>>>> |2068 482
>>>>>>>>>>>> 0 3 96 1 0 0| 20k 24k| 33k 580k| 0 0
>>>>>>>>>>>> |2001 344
>>>>>>>>>>>> 0 4 96 0 0 0|4096B 8192B| 39k 660k| 0 0
>>>>>>>>>>>> |2126 437
>>>>>>>>>>>> [root@babarxrd ~]#
>>>>>>>>>>>> Client side the KanAccess.cfg file is:
>>>>>>>>>>>>
>>>>>>>>>>>> rootenv XNet.RedirDomainAllowRE *.infn.it
>>>>>>>>>>>> rootenv XNet.ConnectDomainAllowRE *.infn.it
>>>>>>>>>>>>
>>>>>>>>>>>> read /store/cfg/* xrootd $XROOTD_HOST:1094/
>>>>>>>>>>>> write /store/cfg/* error
>>>>>>>>>>>>
>>>>>>>>>>>> read /store/cdb/* xrootd $XROOTD_HOST:1094/
>>>>>>>>>>>> write /store/cdb/* error
>>>>>>>>>>>>
>>>>>>>>>>>> read /store/* xrootd $XROOTD_HOST:1094/
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> please hints.
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> Thanks, Armando
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> --
>>>>>>>>>>>> ===================================================
>>>>>>>>>>>> Armando Fella (BaBar support at INFN-CNAF Tier-1)
>>>>>>>>>>>> ---------------------------------------------------
>>>>>>>>>>>> Viale Berti Pichat 6/2, 40127, Bologna
>>>>>>>>>>>> office 3, via Ranzani 13/2
>>>>>>>>>>>>
>>>>>>>>>>>> Email: armando.fella at cnaf.infn.it
>>>>>>>>>>>> armando.fella at pi.infn.it
>>>>>>>>>>>> armando.fella at gmail.com
>>>>>>>>>>>>
>>>>>>>>>>>> Phone in Bologna: +39 051 6092 902
>>>>>>>>>>>> Phone in Pisa: +39 050 2214 231
>>>>>>>>>>>> ===================================================
>>>>>>>>>>>>
>>>>>>>>>>>> ---------------------------------------------------------------------
>>>>>>>>>>>> Unless unavoidable, no Word, Excel or PowerPoint
>>>>>>>>>>>> attachments, please.
>>>>>>>>>>>> See http://www.gnu.org/philosophy/no-word-attachments.html
>>>>>>>>>>>>
>>>>>>>>>>>> ---------------------------------------------------------------------
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> ===================================================
>>>>>>>> Armando Fella (BaBar support at INFN-CNAF Tier-1)
>>>>>>>> ---------------------------------------------------
>>>>>>>> Viale Berti Pichat 6/2, 40127, Bologna
>>>>>>>> office 3, via Ranzani 13/2
>>>>>>>>
>>>>>>>> Email: armando.fella at cnaf.infn.it
>>>>>>>> armando.fella at pi.infn.it
>>>>>>>> armando.fella at gmail.com
>>>>>>>>
>>>>>>>> Phone in Bologna: +39 051 6092 902
>>>>>>>> Phone in Pisa: +39 050 2214 231
>>>>>>>> ===================================================
>>>>>>>>
>>>>>>>> ---------------------------------------------------------------------
>>>>>>>>
>>>>>>>>
>>>>>>>> Unless unavoidable, no Word, Excel or PowerPoint attachments,
>>>>>>>> please.
>>>>>>>> See http://www.gnu.org/philosophy/no-word-attachments.html
>>>>>>>>
>>>>>>>> ---------------------------------------------------------------------
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>
>>>>>> --
>>>>>> ===================================================
>>>>>> Armando Fella (BaBar support at INFN-CNAF Tier-1)
>>>>>> ---------------------------------------------------
>>>>>> Viale Berti Pichat 6/2, 40127, Bologna
>>>>>> office 3, via Ranzani 13/2
>>>>>>
>>>>>> Email: armando.fella at cnaf.infn.it
>>>>>> armando.fella at pi.infn.it
>>>>>> armando.fella at gmail.com
>>>>>>
>>>>>> Phone in Bologna: +39 051 6092 902
>>>>>> Phone in Pisa: +39 050 2214 231
>>>>>> ===================================================
>>>>>>
>>>>>> ---------------------------------------------------------------------
>>>>>>
>>>>>> Unless unavoidable, no Word, Excel or PowerPoint attachments, please.
>>>>>> See http://www.gnu.org/philosophy/no-word-attachments.html
>>>>>>
>>>>>> ---------------------------------------------------------------------
>>>>>>
>>>>>>
>>>>
>>>
>
>


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