NPPS Leadership Team

[Kolja Kauder <kkauder AT gmail.com>]

I _think_ Jerome essentially was just intrigued by the new and shiny S3 at the beginning. Work on adding an XrootD layer did happen but stalled for reasons I'm not privy to and was put "on pause" in July '22. Importantly, the following is an inference, not a thing I've actually heard, but I strongly suspect that SDCC will point out that S3 has been working well for ECCE, ATHENA, and now ePIC, so why divert resources from that?

On Fri, Apr 28, 2023 at 8:44 AM Torre Wenaus via Phys-npps-mgmt-l <phys-npps-mgmt-l AT lists.bnl.gov> wrote:

Thanks a lot Brett. Kolja is well versed in the (Jerome) arguments and can comment.

  Torre

On Fri, Apr 28, 2023 at 8:42 AM Brett Viren <bv AT bnl.gov> wrote:

Hi Torre,

Mostly on XRootD:

DUNE @ SDCC is small fry in comparison to EIC @ SDCC, both in resource
needs and in that BNL is not the host, but XRootD and Rucio are needed
in DUNE as well.  Maybe this "synergy" is somehow useful in your
arguments.

I don't know the backstory but it seems really weird that XRootD is a
sticking point.  At least I fail to see any effort/resource argument
against it.  Here's why:

Back when LBNE (pre DUNE) and Daya Bay had RACF nodes, Ofer gave us
great service to set up and operate XRootD servers and clients.  These
groups were in the "free tier" of RACF service with only about a dozen
nodes each.  I think the effort to scale from that to what EIC needs
would be rather less than linear in the number of nodes.  We also had
the extra complication that the XRootD storage nodes doubled as batch or
interactive nodes.  I expect keeping these roles separate would make for
an even easier provision.  And adding that EIC is not in the "free tier"
it seems historically inconsistent for the XRootD request to be denied.


It may be useful to know the arguments from SDCC to refuse the request.
Maybe they can be included in what you are assembling.


-Brett.

Torre Wenaus via Phys-npps-mgmt-l <phys-npps-mgmt-l AT lists.bnl.gov>
writes:

> Hi all,
> In addition to getting past the BNL embarrassment of not offering XRootD to EIC despite years of requests, I'd
> like to explore ways NPPS could help ePIC with a further and much more impactful change in their data
> management, adopting Rucio. JLab is working on this now. At BNL it sits (rightly) in the wings while we focus
> on sPHENIX. If people have thoughts on how we can help, including leveraging sPHENIX work without impeding it,
> I'd like to hear them. 
>   Torre
>
> --
> -- Torre Wenaus, BNL NPPS Group, ATLAS Experiment
> -- BNL 510A 1-222 | 631-681-7892
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-- Torre Wenaus, BNL NPPS Group, ATLAS Experiment

-- BNL 510A 1-222 | 631-681-7892

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________________________
Kolja Kauder, Ph.D.
NPPS, EIC
Brookhaven National Lab, Upton, NY
+1 (631) 344-5935

he/him/his
________________________