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Lhep at 08:50, 18 July 2008

2008-07-18T08:50:47Z

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===Screen Function===
All the scanning processes should be started in a screen function in order to be able to access from everywhere. In addition, it's very easy to kill an process when it hangs (just kill the screen).

- screen -S myscreen : create a new screen
- screen -r : reattach to the screen
- screen -x : additionally attach to the screen
- inside the screen in order to deattach: Ctrl A D
- inside the screen to close: exit

===Avoid Odyssey Crashes===
Start process with a remote desktop and when it's running, close the remote desktop.

rdesktop -g 1272x930 -k de-ch -u scanner lheppc9

===NFS disks===
To access to a directory through NFS.

'''Example :'''
You want to have access to ''/terabig from lheppc46'' on ''lheppc56''
In this case lheppc46 is the ''server'' and lheppc56 is the ''client''

'''Server configuration :'''
- As superuser open /etc/exports
- Add /terabig lheppc56(rw,all_squash,anonuid=1000,anongid=100,sync) ( more details on [[http://doc.ubuntu-fr.org/nfs]] in french :-) )
'''Remark : UID of scanner is 1000 & GUID of users is 100'''
- Do ''exportfs -ra'' to take into account your modifications
- Start the NFS server : /etc/init.d/nfsserver start
- If all is fine go to '''Client configuration''' , if not I'm sorry for you

'''Client configuration :'''
- As superuser mkdir /terabig_lheppc46
- Open /etc/fstab ( TAKE CARE of this file !!!! )
- Add ''lheppc46:/terabig /terabig_lheppc46 nfs rw,hard,intr,timeo=10 0 0'' ( more details on [[http://linux.die.net/man/5/nfs]] )
- Start NFS client : ''/etc/init.d/nfs start''
- Now you should see the lheppc46's data on /terabig_lheppc46 , if not I'm sorry for you

===Mount lhepsun6 & lhepsun15 -> WORK IN PROGRESS ===
SAMBA :

As superuser do :
mount -t smbfs //lhepsun6/share /terabig/scan/lhepsun6

For the moment no rw permissions, I have to check why

Same problem with
mount -t cifs //lhepsun6/share /terabig/scan/lhepsun6
And next line in /etc/fstab doesn't work
//130.92.139.16/share /terabig/scan/lhepsun6 smbfs rw,user,username=user,password=pass 0 0

Remark : The asked password is the password login for the user scanner

=== Scanning efficiency issues ===

<pre>
Dear Francesco,

this happens when you hit the tracking timeout. In this case, ZERO tracks
are generated.
Try increasing the timeout in SmartTracker8.xxx
Cheers

Cristiano

----- Original Message -----
From: "Francesco Di Capua" <fdicapua@mail.cern.ch>
To: <opera-scanonline@cern.ch>
Sent: Friday, July 18, 2008 10:38 AM
Subject: sysal with high fog

>
> Dear All,
> we received a brick (n.117472) related to the CC event 22877818 with very
> high level of fog,
> we located and reconstructed vertex in intercalibration areas (see
> picture),
> in order to have a reasonable scanning speed the intercalibration areas
> was done with high treshold (900,840) and slope tolerance to 0.4 rad.
> Quality of data is not very good, low efficiency and a lot of views with
> few tracks found (see surface plot).
> Trying to do a better quality volume for vertex analysis, we tried to
> decrease tresholds and increase slope tolerance to 0.6, but we found a
> strange behaviour of Sysal, the scanning seem to start but not microtracks
> at all are found during data taking.
> Do you have any suggestion for parameters to be used in this difficult
> conditions?
>
> Thanks
> Francesco
>
>
</pre>

Tips and Tricks - Revision history

Lhep: 1 revision imported

Lhep at 08:50, 18 July 2008