2024-05-02 Meeting Notes

Operational Issues
Gateways and WNs:
- Current status and upcoming changes

@Thomas, Jyothish (STFC,RAL,SC)

2024-04-23 LHCb WGprod Echo overload (further updates?)

proxy memory has been increased to match allocated memory. Things have been ok since then.

Rocky8 containers with checksum library to be deployed next week
"curl changing the case on el9" - caused some issues on FTS to CNAF

CHEP Abstract ideas

@Thomas, Jyothish (STFC,RAL,SC)

Inputs and thoughts on existing and possible abstracts
The XRootD software framework plays a pivotal role in data access at WLCG (Worldwide LHC Computing Grid) sites. However, when dealing with the Echo storage service, a Ceph-based Erasure Coded object store at the RAL Tier-1, challenges arise due to the unique characteristics of Echo. In this paper, we address the various improvements done to the service, to improve
improvements/studies on deletion rates, load balancing and throughput increase over DC24

XrootD Workshop plan

@Alastair Dewhurst

Rocky 8 and 9 migration planning

CC today for rocky8

Future developments ideas planning work

@Ian Johnson @Thomas, Jyothish (STFC,RAL,SC)

Notes from planning meeting 22-04-2024

Deletion studies through RDR

@Ian Johnson

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Deletions

https://stfc.atlassian.net/browse/XRD-83

Planning for ALICE CMSD redirection

@Thomas, Jyothish (STFC,RAL,SC)

Checksums fixes

@Alexander Rogovskiy @Thomas, Jyothish (STFC,RAL,SC)

Rocky8 containers with checksum library currently in preprod, to be deployed next week

Prefetch studies and WN changes

@Alexander Rogovskiy

Last week LHCb submitted a lot of WGProduction jobs, which overloaded ECHO. As a result, there were a lot of failed jobs and failed downloads as well:

Open

Open

Seems like prefetch config was rolled-out to only part of the preprod farm.
After the incident, 25.04 it was rolled-out to the 2021 gen. Also memory limit was raised for xrootd proxy recently.

Tokens Status

@Thomas, Jyothish (STFC,RAL,SC) @Katy Ellis

CMSD Load balancing

@Thomas Byrne @Thomas, Jyothish (STFC,RAL,SC)

PR:
revised load balancing algorithm - weighed random selection by Jo-stfc · Pull Request #8 · stfc/xrootd

SKA Gateway box

@James Walder

https://stfc.atlassian.net/wiki/spaces/UK/pages/215941180

4 Nodes awaiting installation:

2 for Exit pod (+ 1 existing)
1 for cloud
1 for Tier-1 usage

Xrootd testing framework

@Mariam Demir