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\uD83D\uDDD3 Date

\uD83D\uDC65 Participants

Apologies:
Alison Packer , Alastair Dewhurst

\uD83E\uDD45 Goals

  • List of Epics

  • New tickets

  • Consider new functionality / items

  • Detailed discussion of important topics

  • Site report activity

\uD83D\uDDE3 Discussion topics

Current status of Echo Gateways / WNs testing

Recent sandbox’s for review / deployments:

Item

Presenter

Notes

Vector Read updates to Echo

/wiki/spaces/GRIDPP/pages/188153912

Post-mortem to be held today

Next steps for WN deployment

Move to 5.5.4-2 (core) + 5.5.4-3 (xroot-ceph-buffered):

Status:

lcg2268 running with that config. n_connections from xrdceph file close metrics show similar numbers compared to other nodes in 5.3.3-2 without readv

No failures of lhcb jobs were observed on the test WN so far.

EBUSY in readV requests

XRD-64 - Getting issue details... STATUS

Discussion on merging bufferedIO into master.
Also to discuss pushing changes to “upstream” (xrootd/xroot-ceph”

https://github.com/stfc/xrootd-ceph/pull/44

Needs testing for ‘correctness’

Also some discussion ongoing on xrootd “issues” on the xrootd-ceph sub-module:
https://github.com/xrootd/xrootd/pull/2008

SEGV investigations with -S multi-stream flags

CMSD status

XRD-41 - Getting issue details... STATUS

Thomas, Jyothish (STFC,RAL,SC) identified that xrdcp via the redirector using root protocol requires two “/” in the LFN to work correctly.

  • Although this is the nominally correct path construction for xroot-based paths; existing transfers work with just a single-/ and may break from some corner-case person/VO.

Assuming we want a solution which maintains backwards compatibility, we may need to explicitly add:

all.export / # already existing line
# add in the lines
all.export cms
all.export store #special cms 'namespace' 
# and for other pools

What’s the impact? Do we need “/” export now. Should we consider the authdb file logic too ?
To understand exactly how the export / authdb / “// | /" finally interact ?

Transfers of 0-byte files

XRD-62 - Getting issue details... STATUS

Observed Dune transfer failures using 0-byte files

on GGUS:

Deletion problem at RAL

Slow stat calls at RAL

Problem accessing some LHCb files at RAL

Site reports

✅ Action items

⤴ Decisions

  • Gateway configuration following Option 1 is preferred: “Move to 5.5.4-2 (core) + 5.5.4-3 (xroot-ceph-buffered)”
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