Dear Marcin, thank you for your reply! Your response gave me something to work with, and checking my own filesystem (I run CentOS 5 Linux) I fond that I have ext3. Looking this up it seems the maximum file size is at least 16GB. I also run my scripts on a cluster and there's no 1.9GB limitation there either. I guess there's a built in 1.9GB limit in ROOT, just in case you work on a FAT32 system. Do you know how to remove this limit in ROOT? I've found a thread (<a href="http://root.cern.ch/root/roottalk/roottalk04/2028.html">http://root.cern.ch/root/roottalk/roottalk04/2028.html</a>) where it is suggested to use TTree::SetMaxTreeSize when creating a tree... Is this something you can add somehow in your Gate-code?? Or add before compilation of ROOT? Thanks! /Ida <div class="gmail_quote">2009/11/2 Marcin Balcerzyk <<a href="mailto:m.balcerzyk@pluri.ucm.es">m.balcerzyk@pluri.ucm.es</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Dear Ida. The probable thing is a local disk system limitation. All FAT-32 related systems have 1.8GB file size limit. Root is clever enough to create a series of files, which are separately sensible. If you want to merge them, then probably merging application does not recognize the divided files, not to mention that it cannot write a large file. Solution - on Windows use NTFS system, others - do not know. Note, that you may have a nice 64bit operating system and a lousy 32bit file system. My Red Hat Linux uses such small capacity file system. Other solution is to use network mounted drives to a computer that does not have such file size limitation. Marcin Balcerzyk -----Original Message----- From: <a href="mailto:gate-users-bounces@lists.healthgrid.org">gate-users-bounces@lists.healthgrid.org</a> [mailto:<a href="mailto:gate-users-bounces@lists.healthgrid.org">gate-users-bounces@lists.healthgrid.org</a>] On Behalf Of <a href="mailto:gate-users-request@lists.healthgrid.org">gate-users-request@lists.healthgrid.org</a> Sent: Monday, November 02, 2009 12:00 PM To: <a href="mailto:gate-users@lists.healthgrid.org">gate-users@lists.healthgrid.org</a> Subject: Gate-users Digest, Vol 42, Issue 1 Send Gate-users mailing list submissions to <a href="mailto:gate-users@lists.healthgrid.org">gate-users@lists.healthgrid.org</a> To subscribe or unsubscribe via the World Wide Web, visit <div class="im"> <a href="http://lists.healthgrid.org/mailman/listinfo/gate-users" target="_blank">http://lists.healthgrid.org/mailman/listinfo/gate-users</a> </div>or, via email, send a message with subject or body 'help' to <a href="mailto:gate-users-request@lists.healthgrid.org">gate-users-request@lists.healthgrid.org</a> You can reach the person managing the list at <a href="mailto:gate-users-owner@lists.healthgrid.org">gate-users-owner@lists.healthgrid.org</a> When replying, please edit your Subject line so it is more specific than "Re: Contents of Gate-users digest..." Today's Topics: 1. Merging multiple root files (Ida H?ggstr?m) ---------------------------------------------------------------------- Message: 1 Date: Mon, 2 Nov 2009 09:38:02 +0100 From: Ida H?ggstr?m <<a href="mailto:ida.haggstrom@radfys.umu.se">ida.haggstrom@radfys.umu.se</a>> Subject: [Gate-users] Merging multiple root files To: gate-users <<a href="mailto:gate-users@lists.healthgrid.org">gate-users@lists.healthgrid.org</a>> Message-ID: <<a href="mailto:ff2bc2ff0911020038u595f1216kd7b8845b77c587f4@mail.gmail.com">ff2bc2ff0911020038u595f1216kd7b8845b77c587f4@mail.gmail.com</a>> Content-Type: text/plain; charset="iso-8859-1" <div><div></div><div class="h5"> Hello! I have some problems with merging root files with filemerger after using jobsplitter. Sometimes it works, but for some files I get the error "no latest_event_ID histogram - exit!" and no merged file of course. I think the problem is due to the fact that for some runs I get very large root files, so they are divided into many smaller ones. E.g. for two splitted files I get rootOut1_1, rootOut1, rootOut1_2 and rootOut2, rootOut2_1, rootOut2_2, as supposed to only rootOut1 and rootOut2. When using gjm it tries to merge rootOut1 and rootOut2, which I guess don't contain all information since they are only part of the files. Has anyone any experience with this, or knows how to merge these type of files? thanks! Ida PS. I saw similar posts from April 2008 ( <a href="http://lists.healthgrid.org/archives/gate-users/2008-April/002647.html" target="_blank">http://lists.healthgrid.org/archives/gate-users/2008-April/002647.html</a>) and Oct 2007 ( <a href="http://lists.healthgrid.org/archives/gate-users/2007-October/002110.html" target="_blank">http://lists.healthgrid.org/archives/gate-users/2007-October/002110.html</a>) but I could not get to any scripts or really use anything for myself. </div></div>-------------- next part -------------- An HTML attachment was scrubbed... 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