DPM (Disk Pool Manager) is mutli-protocol distributed storage system that can be easily used within grid environment and it is still popular for medium size sites. Currently DPM can be configured to run in legacy or DOME mode, but official support for the legacy flavour ends this summer and sites using DPM storage should think about their upgrade strategy or coordinate with WLCG DPM Upgrade task force.
We are going to present our almost a year long experience with DPM running in DOME mode on our production storage hosting several petabytes of data for different VOs. Our experience can help others to avoid common problems and also choose right protocols to get best performance from DPM storage. DOME provides support for SRM-less site configuration, but SRM can be still used if necessary and we'll show advantages and/or disadvantages that comes from such configuration.
New DPM features are developed only for DOME mode. We would like to summarize which improvements are available in DOME and these features will never be available for legacy flavour. Running DOME brings greatly improved support for non-GridFTP protocols like full support for transfer checksums, storage resource reporting and most importantly third-party-copy (TPC). We are going to describe DPM TPC support including various credentials delegation mechanisms for XRootD and WebDAV protocols and interoperability with other storage implementations.