Speakers
Ricardo Rocha
Ricardo Rocha
(CERN)
Description
The Disk Pool Manager (DPM) is a lightweight solution for disk storage
management. It provides an easy way to manage and configure disk
pools, and exposes multiple interfaces for data access and control. It
is used in production in more than 200 sites, serving communities like
HEP and Biomed, among many others.
In the last months we have made a big effort to provide standards
compliant data access, with the goal of simplifying both the client
and server side setups - no clients, simpler firewall settings, much
simpler library dependencies.
For POSIX access we have chosen NFS 4.1/pNFS, a very significant
improvement over previous versions of the NFS protocol. It adds
sessions and bulk operations for scalable access over the WAN, strong
security, distributed data access, among many other new features.
For download/upload style access, we have developed a new HTTP/WebDAV
frontend. With it we get DPM data available in virtually any platform
or setup - via web browsers, graphical filesystem browsers or command
line tools like wget or curl - in a very high performance setup.
+C3In this talk we will summarize the status of these components, the
benefits for both clients and system administrators, and early
performance measurements with comparison to existing protocols. We
will describe how this work also benefits the LCG File Catalog (LFC),
which now also exposes a HTTP/WebDAV frontend. Finally, we will also
talk about other improvements we have done to the core of the DPM
system, like filesystem weights, improved drain performance or third
party copies.
