2024-08-01 Meeting Notes

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

@Thomas, Jyothish (STFC,RAL,SC)

‘Memory allocation errors on WN proxy containers’

svc18 causing issues for cms SAM tests (davs refuse to connect)

memory allocation caused by 2 issues: non-pgrw vector read sizes were too large for direct reads, and the gateway containers were running out of memory.

WN container restart order can be improved

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.

.

CMSD Load balancing

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

PR:
https://github.com/stfc/xrootd/pull/14
Code reviewed; item to be marked as done

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

Shoveler

@Katy Ellis

Shoveler installation and monitoring

CC. for WN to report to Shoveler, not yet implemented.

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

Preliminary figures, deleting 3000 small files from 10 gateways simultaneously, using 10 workers and 100 workers:

Open

Seems encouraging, but small files so far. Need to check results for 100 workers as some target files had already been deleted. Moving on to record timings for deleting larger files in the GB range.

Planning for ALICE CMSD redirection

@Thomas, Jyothish (STFC,RAL,SC)

restarted activities on this; looking at how server ‘logs in to the CMSD manager’

Checksums fixes

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

Prefetch studies and WN changes

@Alexander Rogovskiy

Open

Prefetch activities complete.

Tokens Status

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

SKA Gateway box

@James Walder

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

AQ configuration for Bonded VLANs seems OK. Netbox config for {02,03} seem ok.

Issues with PXE booting and OS installation due to routing between AQ and hosts. JC and JA to look into this

Xrootd testing framework

@Mariam Demir

XRootD Site Testing Framework