TWiki Legacy - AliceMigrationToCASTORWLCGTape

Owned by Ian Johnson
Last updated: Oct 03, 2022
3 min read

 

CASTOR XRootD redirector

 

Task

Who

Dependency

Status

Notes

Date due

 

  1. Complete Aquilon profile of the redirector

George

 

Done

 

 

 

  1. Discuss the published sandbox with Ian

George/Ian

 

Done

 

 

 

  1. Install grid host certificate

George

 

Done

*With Subject alt names

 

 

  1. Internal testing of the redirector

George/Ian

1,3

Ongoing

Copied in/out files from lcgui03

 

 

  1. Security and service review

George/David

 

Done

Suggested alias: xrootd-alice-tape.gridpp.rl.ac.uk Vulnerability scan done and issues addressed

 

 

  1. Ensure external accessibility of the redirector

Networking team

 

Done

RT221047

 

 

  1. External testing of the redirector (vCert)

ALICE

1,3,5

Done

http://alimonitor.cern.ch

 

 

  1. Ensure Nagios tests and monitoring are in place - internal

George

 

Done

 

 

  1. Submit change control document

George

 

Done

 

 

10. Disable gsi auth in xrootd server config on WLCGTape disk servers

George

 

Done

elog

 

 

11. Attach redirector to WLCGTape and test

George/ALICE

 

Done

 

 

12. Ensure external monitoring references new service

George

 

Done

Requested ALICE to start running SAM tests

 

 

13. Migration of ALICE to the new endpoint

George

 

Done

 

 

 

Intervention plan

 

  • 08:00 Start of GOCDB downtime

  • 09:15 Set the disk servers in the tape-backed pool of the migrated instance to read-only mode

  • 09:45 Ensure that there are no unmigrated files left in the tape buffer (see here)

  • 10:00 Start of Nagios downtime

  • 10:00 Nagios downtime begins

  • 10:05 Bring CASTOR down

  • 10:30 Ensure that ALICE has switched the tape endpoint from cgendlf.ads.rl.ac.uk to xrootd-alice-tape.gridpp.rl.ac.uk

  • 11:00 Bring CASTOR up and perform functional tests

  • 12:00 End of Nagios and GOCDB downtime