2023-09-07 Meeting Notes

XRootD Releases

No news on 6.2 yet

Prefetch studies

Alex

prefetch works but needs an increased timeout env variable

Deletion studies through RDR

Ian

CMSD rollout

https://stfc.atlassian.net/browse/XRD-41

Status:

webdav alias has been pruned

CMSD operations: observations

gateways under heavy system load:

Open

alice gateways were suspected to be causing issues with the ceph cluster due to read amplification caused by the xrdceph buffers:

Open

however removing the buffers directly correlated with a general increase in op times so the change was reverted:

Oxford VP moved to QMUL
Sheffield is also going to be moved

CMSD outstanding items

Icinga / nags callout tests changes. - live and available

Improved load balancing / server failover triggering -

better 'rolling server restart script'

Documentation; setup / configuration / operations / troubleshooting / testing

Review of Sandbox and deployment to prod.

Tokens testing

NTR

AAA Gateways

Sandbox ready for review:

http://aquilon.gridpp.rl.ac.uk/sandboxes/diff.php?sandbox=jw-xrootd-aaa-5.5.4-3

SKA Gateway box

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

now working using ska pool on ceph dev

…

extra gateways deployment

DNS round robin for internal (batch farm) use of the gateways on the new network pending ipv6 external access ~2 weeks

ALICE WN gateways

• lcg2347.gridpp.rl.ac.uk

• lcg2346.gridpp.rl.ac.uk

(Birmingham using eos, Oxford no storage)