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\uD83D\uDDD3 Date

\uD83D\uDC65 Participants

Apologies:

CC:

\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

Operational Issues

Thomas, Jyothish (STFC,RAL,SC)

Gateways and WNs:
- Current status and upcoming changes

Thomas, Jyothish (STFC,RAL,SC)

  • Tokens

  • Checksum plugin (see below):

  • Rocky 8 (see next

Rocky 8 migration planning

Thomas, Jyothish (STFC,RAL,SC)

  • Technical impediments ?

  • Performance comparisons:

    View file
    namerock8vssl7.pdf

  • Plans for migration

    • What to do about the redirectors ?

S&C ATLAS week

James Walder

Next week S&C; Anything to discuss with Andy H et al. ?

ECHO File transfer / throughput studies

Katy Ellis

Updates?

Checksums fixes

Alexander Rogovskiy

Status and plans for improving Checksumming work …

https://github.com/alex-rg/xrd_ckslib/tree/main
I

Jira Legacy
serverSystem JIRA
serverId929eceee-34b0-3928-beeb-a1a37de31a8b
keyXRD-56

  • Code review complete; awaiting updates

  • Packaging; how to package the rpm (headers from XrdCks only from xrootd source files … ?)

Prefetch studies and WN changes

Alexander Rogovskiy

Sandbox ready and applied to 1 WN, pending envroinment variable for timeout increase

Deletion studies through RDR

Ian Johnson

Latest deletion rates for 3 GiB files: 21 Hz

Desire deletion rate from ATLAS: ~ 4 Hz

Latest deletion rates for 1 KiB files: 59 Hz

Deletion rates measured using 10 threads (VM with 16 vCPUs). In conversation with CERN DDM, Rucio reaper is using 10 threads (for ATLAS?).

Next: measure deletion rate for 6 GiB files. Testing with 1 KiB files works up to 4000 files (deletion client on two VMs), but fails with 10000 files. Investig

Tokens testing

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

Jira Legacy
serverSystem JIRA
serverId929eceee-34b0-3928-beeb-a1a37de31a8b
keyXRD-63

Jira Legacy
serverSystem JIRA
serverId929eceee-34b0-3928-beeb-a1a37de31a8b
keyXRD-78

https://github.com/xrootd/xrootd/pull/2152

https://github.com/xrootd/xrootd/pull/2151/files

Understanding CMSD Loadbalancing

Thomas Byrne

SKA Gateway box

James Walder

/wiki/spaces/UK/pages/215941180

TEST

SVC16(R8)MEAN

SVC26(SL7)MEAN

SVC16(R8)MEDIAN

SVC26(SL7)MEDIAN

davsdelete

0.47126

0.40214

0.464

0.381

davsread

13.7352

12.7532

13.677

12.727

davsstat

0.19786

0.18454

0.181

0.181

davswrite

28.9813

23.9641

28.992

23.798

rootdelete

0.27626

0.2847

0.258

0.253

rootread

13.0728

12.0312

13.041

11.86

rootstat

0.08458

0.07198

0.083

0.063

rootwrite

25.3381

23.7827

25.312

23.738

tpcdest

43.3166

40.3735

43.349

40.668

tpcsource

37.468

24.8932

34.181

31.581

on GGUS:

Site reports

Lancaster - Unbalanced redirector issues from last week just disappeared… Currently disabled tokens for the reasonsTokens still disabled, but we reckon there will be pressure to re-enable. Pondering how to implement a network QoS to help reduce cephfs drop outs by guaranteeing a slither of bandwidth on the gateway hosts for ceph traffic. Also pondering dedicated internal gateways.

Glasgow - relatively stable, few network issues. OS/Ceph version update to do.

✅ Action items

  • James Walder to schedule a ‘hackathon’ within a F2F to have a session on architectural planning.

  • James Walder to prepare an outline of the expected roadmap for XRootD developments in 2024.

⤴ Decisions