2024-08-01 Meeting Notes

Date

Aug 1, 2024

Participants

@James Walder
@Thomas, Jyothish (STFC,RAL,SC)
@Alexander Rogovskiy
@Ian Johnson
@Mariam Demir
@Robert Appleyard
Lancs: Gerard, Steven
Glasgow: Sam

Apologies:

CC:

Goals

List of Epics
New tickets
Consider new functionality / items
Detailed discussion of important topics
Site report activity

Discussion topics

Current status of Echo Gateways / WNs testing

Recent sandbox’s for review / deployments:

Item	Presenter	Notes

Item	Presenter	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: 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	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