2023-04-13 Meeting Notes

XrootD 5.5.4 testing

@Thomas, Jyothish (STFC,RAL,SC) ; set in AQ; Awaiting Prod hosts to pick up the change. Running on Alice + AAA + gw7

SEGV investigations with -S multi-stream flags

XRootD server v5.5.4 seems to support multiple streams well with the Ceph plugin. Testing with 1, 2, 4, 8 and 15 streams hasn’t produced the SEGV or any other problems (so far). Unfortunately, there isn’t significant scaling of transfer rates using multiple streams, as the server processes the streams sequentially and synchronously (not concurrently or asynchronously). There’s an Andygram about this at xrdcp with single socket vs parallel sockets vs extreme copy mode · Issue #1938 · xrootd/xrootd

Fix for paged writes when misaligned to end of buffer

Bug fix for writes with bufferedIO when extending over buffer range. by snafus · Pull Request #40 · stfc/xrootd-ceph

Identified a few failing transfers due to paged writes and case of misalignment at end of the buffer. Sanity checking caught the issue and failure the transfer. Tests with PR code passing on dev machine.

CMSD status

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

CC document

https://stfc.atlassian.net/wiki/spaces/GRIDPP/pages/136446019/High-level+XrootD+redirection+for+Echo?focusedCommentId=136118425

https://helpdesk.gridpp.rl.ac.uk/Ticket/Display.html?id=481645

https://helpdesk.gridpp.rl.ac.uk/Ticket/Display.html?id=481665

echo-manager{01,02} re-iped to OPN, but wrong IPv6 addresses given to the alias - being corrected.
- final SAN ?

Keep with the original planned rdr echo address ?

Vector Read

https://stfc.atlassian.net/wiki/spaces/GRIDPP/pages/137265343/Non-striper+read+v+implementation+for+WN+s+xrootd+gateways

Need to arrange dates for next review;

Updated test version 5.3.3.14 deployed to test WNs;
Preparing for whole tranche testing