NFS 4.1 Working Group

This working group is evaluating the open NFS 4.1 (pNFS) protocol as the generic POSIX access for EMI data sources and applications. Partners involved are DESY, CERN and CNAF/INFN.

Common Documents

Where When Who What
Amsterdam Jamboree July 2010 Gerd Behrmann / NFS 4.1, 11 Reasons you should care
WLCG Collaboration Workshop June 2010 Patrick, Jean-Philippe for WLCG and EMI Introduction of Demonstrator

DESY Test System setup

Task People
Testbed Dima and Yves
pNFS kernel and driver Tigran
NFS4.1 dCache server Tigran and Tanja
Hammercloud support Johannes Elmsheuser, Atlas, Munich

  • dCache server : In order to allow fast turnover, the recent NFS4.1 code tested here, is not yet checked into the official trunk of the dCache code management system. Therefore, there is no official dCache version available yet, with the features tested here. The plan is to make such a system publicly available before CHEP 10.
  • pNFS client : We are running the 2.6.35 kernel with pNFS driver, prepared for SL5 plus the corresponding mount tools on SL5 workernodes.
  • Security :
    • All tests are done w/o integrity and encryption.
    • Beta version of Kerberos code available but not yet sufficiently tested.

Storage and CPU Power
Amount Type CPU RAM Cores Network Disk
1 dCache Headnode Intel(R) Xeon(R) CPU 5160 @ 3.00GHz 8GB 4 1 GBit 0
5 dCache Pool Intel(R) Xeon(R) CPU 5520 @ 2.27GHz 12 GB 16 10 GBit 12 * 2 Tbytes
16 or 32 Workernodes Intel(R) Xeon(R) CPU 5150 @ 2.66GHz 4 GB 8 1 GBit 0

WN ← 1Gbit → Force 10 ← 4 * 10 GBIT → Arista ← 10 GBit → dCache pools

Test type What Time / Amount Result Detail
Stability CFEL data transfers 10 days with 13 TBytes sustained writing with 100GB av. filesize Passed OK
Stability CFEL checkusm 13 TBytes; one machine Slow Very old client machine
Performance Hammercloud 128 cores against 100 TBytes Still ongoing Performance results are evaluated

Preliminary Results
  • The plots and diagrams below have been create by Dima and Yves with great support by Johannes Elmsheuser from Munich in preparation of the final NFS4.1 evaluation.
  • As these are prelimenary investigations, please honor the fact that you are not allowed to use the information, text and pictures on this web page in publications or public presentations, without written permission of the authors.

Overall Efficiency CPU to Walltime ratio NFS 4.1 data transfers (out)
overall-efficiency.jpg 20100903-prelim-cpu-walltime.png 20100903-prelim-data-out.png

-- PatrickFuhrmann - 02-Sep-2010

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Topic revision: r4 - 2010-09-04 - PatrickFuhrmann
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