1. 1/3 G. Manduchi EPICS Collaboration Meeting Spring 2010 New EPICS Channel Archiver based on MDSplus data system G. Manduchi, A. Luchetta, C. Taliercio, A. Soppelsa, A. Barbalace Consorzio RFX – Euratom-ENEA Association  MDSplus is a data system widely used in the fusion community  Provides tools and libraries for management of a rich variety of data  Used in several fusion experiments for data acquisition  Used in fusion as common format to exhcange experimental data

2. 2/3 G. Manduchi EPICS Collaboration Meeting Spring 2010 MDSplus vs EPICS Channel Archiver  The Channel archivers store plant data exported as EPICS Process Variables (PVs) in a database (indexed file for EPICS, pulse file for MDSplus)  The MDSPlus channel archiver can sustain a much larger data throughput  Tests carried out pointed out the limits in the EPICS archiver (lost samples and CPU load)  in the new archiver data loss (0.05% of the total samples) starts at a rate of 300 kUpdate/s  In the original EPICS archive data loss starts at a rate of 20 kUpdates/s  MDSplus is a rugged data system since it has been used for almost 20 years in fusion devices for handling online and offline data acquisition

3. 3/3 G. Manduchi EPICS Collaboration Meeting Spring 2010 Remote Data Access  Remote data access was provided by the original EPICS Channel Archiver  Based on XML RPC  Limited support for programmatic data access (management of XML RPC protocol)  When stored on MDSplus pulse files, data are natively available worldwide  Use the mdsip protocol, optimized for communication speed  Available in a variety of languages (Fortran, C, C++, Java, Python, IDL, Matlab)  jScope provides interactive visualization of stored waveforms.