Attending: Brian, JohnH, Winnie, Sam, Teng, Jens (chair+mins), Ste, PeteC


The technical meeting last Friday, on DPM support.

Sam and Alastair presented presentations, discussing proposed architecture for
smaller sites.

Non-DPM options would include ECHO/CEPH type storage, with xrootd proxy cache.
EOS sort of claimed to have erasure codes as well but apparently not quite ready
for production.

Glasgow will be testing a CEPH based solution/alternative.  Cambridge awaiting
results of Mark testing xroot proxy cache; then, if satisfactory results are
obtained, considering moving from DPM to xroot proxy cache.

Other DPM sites have no plans at this point (or didn't attend/report) - see chatlog.

Other possibilities include, of course, StoRM on Lustre, maybe not StoRM on HDFS,
StoRM on CEPHFS.  dCache has a CEPH version talking to the block storage.

DPM on HDFS won't work, though, as it cannot work when migrating to DOME.



RobA has kindly agreed to give a report from HEPiX in San Diego.

Regarding DOME, still recognised as "exciting".  People should use puppet rather
than attempt to do things by hand; which reminds us we were talking some time ago
about sharing puppet files.  There's a proliferation of amateur puppet scripts;
it might be better to have them reworked by people who know puppet?

Apropos CEPH, UMich presented a distributed CEPH; assumes equal and sufficient bandwidth
to participating sites.  COmanage used to manage VOs.

CTA talk didn't happen; speakers didn't receive the slides... CERN have 17PB of CEPH
integrated with OpenStack manila, 4+2 EC, with S3 the default for CVMFS.

BNL talk on "large and cheap" storage, $0.06-$0.11 per GB.  TCO for storage also
looking at cost of tape etc.

Andrea Sciaba talked about disk wanted vs disk we can afford - and how it will affect
the user workflows.  There's a list of workflows.  Workflows might also need updating
for different types of storage when they go into production, e.g. NVM, but that's a
different story.  "Nearline HD" for cloud and HEP - like MAID?  Also notes about an
archive grade SSD, writeable perhaps only 20 times.  Optical storage, however, has not
been heard from...



Brian
https://indico.cern.ch/event/813140/
BD
Ste
Mic not working. No plan to d anything.
Sorry - noplanto do anything.
Keyboard not working either...
SJ
Teng
No plan yet as well. Ceph or cache depending on what GridPP6 looks like
T
Ste
No MIC
We won't do anything, I think. We're just sittingonit.
SJ
Today at 10:25 AM