2024-08-08 Meeting Notes

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

@Thomas, Jyothish (STFC,RAL,SC)

Close wait observed issues, leading to crash or manual restarts. Some failures on CMS sam test, LHCb has identified there are some file corruptions, and lost files. ‘race condition’ between a delete and problematic uploads.

ATLAS saw some issues. Only appears to have affected WebDAV transfers.

“server refused to connect” messages in the logs.

Stopped around midnight Sunday.

Compilation issues with XrdCeph and rocky 8 with 5.6+

Problems compiling XrdCeph alongside core xrootd (warning message → termination of compilation)

With standalone XrdCeph crashes

@James Walder and @Thomas, Jyothish (STFC,RAL,SC) to review the code and debugging.

compilations appear to be be reporting as the GitHub version.

Gateway Auth failures

@Thomas, Jyothish (STFC,RAL,SC)

Auto-restarting on this failure mode is enable. Still observing occasional cases.

XrootD Workshop plan

@Alastair Dewhurst

XRootD and FTS Workshop @ STFC UK

One month to go!

• Registrations …

• Abstracts (from UK):

  • What themes and topics ?

  • Who to talk …

• Tokens - Summary talk ? Or a Session on tokens. (Dimitrios, ATLAS talk? Dune Talk?)

Community talk session ? (some remote speakers ,scheduling).

Shoveler? ?

Themes ?

• UK …. xrootd + Ceph ?

Shoveler

@Katy Ellis

Open

Shoveler installation and monitoring

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

Deletions

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

Planning for ALICE CMSD redirection

@Thomas, Jyothish (STFC,RAL,SC)

Now managed by redirector, using the DNS round robin.

Checksums fixes

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

Prefetch studies and WN changes

@Alexander Rogovskiy

Tokens Status

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

Xrootd testing framework

@Mariam Demir

XRootD Site Testing Framework

Pull requests · stfc/xrootd-testing-framework

SKA Gateway box

@James Walder

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

No progress with DHCP config.

Still issues with DHCP and booting. Work arrounds being investigated