1. Operating Software – Migration to Linux Ralf Huhmann FAIR MiniTAC Controls May 15, 2007

2. 15. May 2007 2 Overview Applications for Acc. Controls User-InterfaceDatabaseDevice-Interface

3. 15. May 2007 3  Hardware: Cluster of DEC-Alphas (Hewlett-Packard)  OS: Open VMS  User-Interface: X11/Motif-based on X-Terminals, Hardware Display and Control Units (Knobs, Key, LED)  Database: Oracle 10g on Linux-Cluster (migrated from Oracle RDB on OpenVMS)  Codebase: DEC-F77 (F90,F95) (~million lines of code) Present Situation

4. 15. May 2007 4 Aspects of Migration to Linux Reasons:  Phase-out of OpenVMS at GSI  connectivity to systems used for FAIR controls  use of nowadays techniques for new development, unique platform for operating Efforts: 7 (3/4) FTE man power

5. 15. May 2007 5 Migration Aims  native Unix/Linux Run-Time Environment  porting of current VMS-Applications with minimal source-modification  using open standards for interconnectivity (TCP/IP, XML, CORBA, JAVA,...)

6. 15. May 2007 6 Migration Status  database migration done and in production  evaluation of commercial migration tools failed  technical feasibility of porting proved with own run-time utilities  prototype application ported

7. 15. May 2007 7 Challenges of Porting  Run-Time Libraries for VMS-System API (events, timer, IPC), “VMS”-Event- and X11-Event-Handling  handle DEC-Fortran77 extensions by source- modification  Interconnectivity between ported applications and new applications